342 lines
18 KiB
JSON
342 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-56720",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-27T15:00:39.858Z",
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"datePublished": "2024-12-29T11:29:58.345Z",
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"dateUpdated": "2026-08-05T11:46:18.145Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:46:18.145Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Several fixes to bpf_msg_pop_data\n\nSeveral fixes to bpf_msg_pop_data,\n1. In sk_msg_shift_left, we should put_page\n2. if (len == 0), return early is better\n3. pop the entire sk_msg (last == msg->sg.size) should be supported\n4. Fix for the value of variable \"a\"\n5. In sk_msg_shift_left, after shifting, i has already pointed to the next\nelement. Addtional sk_msg_iter_var_next may result in BUG."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable helper runs from `sk_psock_msg_verdict()` on the local egress path, requiring a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap plus a local `sendmsg()` on a sockmap'd socket; there is no remote packet path into `bpf_msg_pop_data()` since SK_MSG programs only process data the local host is sending.\nAC:L - The bug is fully deterministic and entirely attacker-controlled — the sender chooses the write size that splits the message across scatterlist elements (making `offset != 0`), and the BPF program chooses a `start` that lands in a later element, so `a = start` is guaranteed to exceed `sge->length` with no race, timing, or memory-layout dependency.\nPR:L - Setting up the sockmap and SK_MSG program requires CAP_BPF and CAP_NET_ADMIN, but `bpf_token_capable()` grants these at `ns_capable()` level inside a user namespace via delegated BPF tokens, and both capabilities are routinely handed to container workloads, so an ordinary unprivileged-in-init-ns user can reach this path.\nUI:N - No victim action is required — the attacker loads the SK_MSG program and issues the triggering `sendmsg()` entirely on their own, with no file to open, filesystem to mount, or third party to interact with.\nS:U - The out-of-bounds reads, heap overflow, and scatterlist-ring corruption are all confined to the kernel's own memory and the socket's psock state; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The corrupted scatterlist entry carries an inflated `length` (up to ~4 GB after the signed-to-unsigned wrap of `b`) and an `offset` past the page, and `tcp_bpf_push()` hands those verbatim to `tcp_sendmsg_locked()` with MSG_SPLICE_PAGES, transmitting arbitrary adjacent kernel heap memory to the socket peer; the `!space` path additionally performs `memcpy(to, from, a)` reading far past the source element.\nI:H - In the no-space branch `memcpy(to, from, a)` and `memcpy(to + a, from + a + pop, b)` write attacker-sized data past an undersized `alloc_pages()` allocation — a controlled heap buffer overflow — and the missing `put_page()` plus the stray `sk_msg_iter_var_next()` rotate the entire sg ring, installing stale `struct page *` values that produce refcount imbalance and use-after-free of pages.\nA:H - A negative `b` passed to `memcpy()` as `size_t`, a scatterlist entry pointing far outside its page, and `sk_msg_shift_left()` corrupting the whole fragment ring all lead directly to kernel oops/panic, while the missing `put_page()` permanently leaks a page per popped element."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/filter.c"
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],
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"versions": [
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "d3f5763b3062514a234114e97bbde74d8d702449",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "d26d977633d1d0b8bf9407278189bd0a8d973323",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "e1f54c61c4c9a5244eb8159dce60d248f7d97b32",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "f58d3aa457e77a3d9b3df2ab081dcf9950f6029f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "98c7ea7d11f2588e8197db042e0291e4ac8f8346",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "785180bed9879680d8e5c5e1b54c8ae8d948f4c8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "275a9f3ef8fabb0cb282a62b9e164dedba7284c5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
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"lessThan": "5d609ba262475db450ba69b8e8a557bd768ac07a",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/filter.c"
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],
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"versions": [
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{
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"version": "5.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.287",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.231",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.174",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.120",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.64",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.11",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.2",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.0",
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"versionEndExcluding": "5.4.287"
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"url": "https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449"
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},
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{
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"url": "https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32"
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},
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{
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"url": "https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f"
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},
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{
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"url": "https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346"
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},
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{
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"url": "https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8"
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},
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{
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"url": "https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5"
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},
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{
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"url": "https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a"
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}
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],
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"title": "bpf, sockmap: Several fixes to bpf_msg_pop_data",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-56720",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:58:21.307610Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-401",
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"description": "CWE-401 Missing Release of Memory after Effective Lifetime"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-10-01T20:07:06.140Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T20:53:12.383Z"
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}
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}
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]
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}
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} |