258 lines
13 KiB
JSON
258 lines
13 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-2024-49861",
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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": "2024-10-21T12:17:06.017Z",
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"datePublished": "2024-10-21T12:27:19.321Z",
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"dateUpdated": "2026-08-05T11:40:09.965Z"
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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": "2026-08-05T11:40:09.965Z"
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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: Fix helper writes to read-only maps\n\nLonial found an issue that despite user- and BPF-side frozen BPF map\n(like in case of .rodata), it was still possible to write into it from\na BPF program side through specific helpers having ARG_PTR_TO_{LONG,INT}\nas arguments.\n\nIn check_func_arg() when the argument is as mentioned, the meta->raw_mode\nis never set. Later, check_helper_mem_access(), under the case of\nPTR_TO_MAP_VALUE as register base type, it assumes BPF_READ for the\nsubsequent call to check_map_access_type() and given the BPF map is\nread-only it succeeds.\n\nThe helpers really need to be annotated as ARG_PTR_TO_{LONG,INT} | MEM_UNINIT\nwhen results are written into them as opposed to read out of them. The\nlatter indicates that it's okay to pass a pointer to uninitialized memory\nas the memory is written to anyway.\n\nHowever, ARG_PTR_TO_{LONG,INT} is a special case of ARG_PTR_TO_FIXED_SIZE_MEM\njust with additional alignment requirement. So it is better to just get\nrid of the ARG_PTR_TO_{LONG,INT} special cases altogether and reuse the\nfixed size memory types. For this, add MEM_ALIGNED to additionally ensure\nalignment given these helpers write directly into the args via *<ptr> = val.\nThe .arg*_size has been initialized reflecting the actual sizeof(*<ptr>).\n\nMEM_ALIGNED can only be used in combination with MEM_FIXED_SIZE annotated\nargument types, since in !MEM_FIXED_SIZE cases the verifier does not know\nthe buffer size a priori and therefore cannot blindly write *<ptr> = val."
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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 vulnerability is reached by loading and running a crafted eBPF program via the local bpf() syscall; there is no network-facing path to the verifier.\nAC:L - The verifier flaw is triggered deterministically by a specifically crafted BPF program passing a rodata map pointer to an affected helper—no race or attacker-uncontrolled condition is involved.\nPR:L - The affected helpers (bpf_strtol/bpf_strtoul) are in the unprivileged tier of bpf_base_func_proto and reachable by unprivileged socket-filter programs when unprivileged BPF is enabled; an ordinary local account suffices.\nUI:N - The attacker loads and executes their own BPF program; no action from any other user is required.\nS:U - The corruption and resulting privilege escalation occur within the kernel's own security authority; no VM/IOMMU/sandbox boundary is crossed.\nC:H - Writing into a frozen read-only map defeats the verifier's constant-folding soundness, enabling out-of-bounds/arbitrary kernel memory reads and disclosure.\nI:H - The bug is a verifier bypass giving a write into memory the verifier assumed immutable, the canonical primitive for arbitrary kernel write and code-execution/privilege escalation.\nA:H - The resulting memory corruption can crash or fully compromise the kernel."
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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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"include/linux/bpf.h",
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"kernel/bpf/helpers.c",
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"kernel/bpf/syscall.c",
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"kernel/bpf/verifier.c",
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"kernel/trace/bpf_trace.c",
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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": "57c3bb725a3dd97d960d7e1cd0845d88de53217f",
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"lessThan": "988e55abcf7fdb8fc9a76a7cf3f4e939a4d4fb3a",
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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": "57c3bb725a3dd97d960d7e1cd0845d88de53217f",
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"lessThan": "a2c8dc7e21803257e762b0bf067fd13e9c995da0",
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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": "57c3bb725a3dd97d960d7e1cd0845d88de53217f",
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"lessThan": "2ed98ee02d1e08afee88f54baec39ea78dc8a23c",
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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": "57c3bb725a3dd97d960d7e1cd0845d88de53217f",
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"lessThan": "1e75d25133158b525e0456876e9bcfd6b2993fd5",
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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": "57c3bb725a3dd97d960d7e1cd0845d88de53217f",
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"lessThan": "32556ce93bc45c730829083cb60f95a2728ea48b",
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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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"include/linux/bpf.h",
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"kernel/bpf/helpers.c",
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"kernel/bpf/syscall.c",
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"kernel/bpf/verifier.c",
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"kernel/trace/bpf_trace.c",
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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": "5.2",
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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": "5.2",
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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": "6.6.54",
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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": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.2",
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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",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.1.120"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.6.54"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.10.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.11.2"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.12"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/988e55abcf7fdb8fc9a76a7cf3f4e939a4d4fb3a"
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},
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{
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"url": "https://git.kernel.org/stable/c/a2c8dc7e21803257e762b0bf067fd13e9c995da0"
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},
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{
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"url": "https://git.kernel.org/stable/c/2ed98ee02d1e08afee88f54baec39ea78dc8a23c"
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},
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{
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"url": "https://git.kernel.org/stable/c/1e75d25133158b525e0456876e9bcfd6b2993fd5"
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},
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{
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"url": "https://git.kernel.org/stable/c/32556ce93bc45c730829083cb60f95a2728ea48b"
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}
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],
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"title": "bpf: Fix helper writes to read-only maps",
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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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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-49861",
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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": "2024-10-21T12:55:39.105078Z"
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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": "2024-10-21T13:04:10.325Z"
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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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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T20:41:16.087Z"
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}
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}
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]
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}
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} |