300 lines
16 KiB
JSON
300 lines
16 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-2024-56759",
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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": "2024-12-29T11:26:39.761Z",
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"datePublished": "2025-01-06T16:20:39.668Z",
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"dateUpdated": "2026-08-05T11:46:23.511Z"
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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": "2026-08-05T11:46:23.511Z"
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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\nbtrfs: fix use-after-free when COWing tree bock and tracing is enabled\n\nWhen a COWing a tree block, at btrfs_cow_block(), and we have the\ntracepoint trace_btrfs_cow_block() enabled and preemption is also enabled\n(CONFIG_PREEMPT=y), we can trigger a use-after-free in the COWed extent\nbuffer while inside the tracepoint code. This is because in some paths\nthat call btrfs_cow_block(), such as btrfs_search_slot(), we are holding\nthe last reference on the extent buffer @buf so btrfs_force_cow_block()\ndrops the last reference on the @buf extent buffer when it calls\nfree_extent_buffer_stale(buf), which schedules the release of the extent\nbuffer with RCU. This means that if we are on a kernel with preemption,\nthe current task may be preempted before calling trace_btrfs_cow_block()\nand the extent buffer already released by the time trace_btrfs_cow_block()\nis called, resulting in a use-after-free.\n\nFix this by moving the trace_btrfs_cow_block() from btrfs_cow_block() to\nbtrfs_force_cow_block() before the COWed extent buffer is freed.\nThis also has a side effect of invoking the tracepoint in the tree defrag\ncode, at defrag.c:btrfs_realloc_node(), since btrfs_force_cow_block() is\ncalled there, but this is fine and it was actually missing there."
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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 code is btrfs's core b-tree COW path, reached through ordinary filesystem syscalls (write, create, unlink, rename) on a mounted btrfs volume. This requires local access to the system; there is no network protocol handler involved.\nAC:L - The attacker fully controls the triggering side — every metadata modification calls btrfs_search_slot() → btrfs_cow_block(), so the free-then-trace window can be retried millions of times, and the attacker can raise CPU/scheduling pressure with concurrent threads to make preemption at that point (and elapse of the RCU grace period) occur. A race the attacker can drive at will and retry unboundedly is Low complexity.\nPR:L - Only an unprivileged local account with write access to any btrfs filesystem is needed; no capability, CAP_SYS_ADMIN, or namespace check exists anywhere on the btrfs_search_slot() → btrfs_cow_block() path. Writing into a home directory or container rootfs on btrfs is sufficient.\nUI:N - The attacker triggers the COW path directly with its own filesystem operations; no victim action, mount, or file-open by another user is required.\nS:U - The use-after-free is confined to kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed extent_buffer is read after release from a mergeable, non-TYPESAFE_BY_RCU slab cache, and btrfs_header_level(buf) loads eb->folios[0] and dereferences it — with heap spray this becomes a controlled-address read whose result is emitted into the trace ring buffer, disclosing kernel memory.\nI:H - The use-after-free on a reclaimable, slab-mergeable object gives the attacker influence over the contents of the reused allocation and the pointer subsequently dereferenced, which is the standard primitive for escalating a UAF into kernel memory corruption and control-flow hijacking.\nA:H - Dereferencing the freed extent_buffer and its stale folios[0] pointer causes a wild-pointer access that oopses or panics the kernel (this is exactly what syzbot's KASAN report captured), and it can be re-triggered repeatedly."
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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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"fs/btrfs/ctree.c"
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],
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"versions": [
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{
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"version": "3083ee2e18b701122a3b841db83448543a87a583",
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"lessThan": "ba5120a2fb5f23b4d39d302e181aa5d4e28a90d1",
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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": "3083ee2e18b701122a3b841db83448543a87a583",
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"lessThan": "526ff5b27f090fb15040471f892cd2c9899ce314",
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"status": "affected",
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"versionType": "git"
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"lessThan": "66376f1a73cba57fd0af2631d7888605b738e499",
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"status": "affected",
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"lessThan": "9a466b8693b9add05de99af00c7bdff8259ecf19",
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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": "3083ee2e18b701122a3b841db83448543a87a583",
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"lessThan": "c3a403d8ce36f5a809a492581de5ad17843e4701",
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"status": "affected",
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"lessThan": "44f52bbe96dfdbe4aca3818a2534520082a07040",
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"status": "affected",
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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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"fs/btrfs/ctree.c"
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],
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"versions": [
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{
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"version": "3.4",
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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": "3.4",
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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": "5.10.233",
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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": "5.15.176",
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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": "6.1.124",
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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": "6.6.70",
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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": "6.12.8",
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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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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.4",
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"versionEndExcluding": "5.10.233"
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"references": [
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"url": "https://git.kernel.org/stable/c/ba5120a2fb5f23b4d39d302e181aa5d4e28a90d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/526ff5b27f090fb15040471f892cd2c9899ce314"
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"url": "https://git.kernel.org/stable/c/66376f1a73cba57fd0af2631d7888605b738e499"
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{
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"url": "https://git.kernel.org/stable/c/9a466b8693b9add05de99af00c7bdff8259ecf19"
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{
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"url": "https://git.kernel.org/stable/c/c3a403d8ce36f5a809a492581de5ad17843e4701"
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{
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"url": "https://git.kernel.org/stable/c/44f52bbe96dfdbe4aca3818a2534520082a07040"
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}
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],
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"title": "btrfs: fix use-after-free when COWing tree bock and tracing is enabled",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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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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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"confidentialityImpact": "HIGH"
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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-2024-56759",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-02-11T15:41:24.236942Z"
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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-416",
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"description": "CWE-416 Use After Free"
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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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"shortName": "CISA-ADP",
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"dateUpdated": "2025-02-11T15:45:20.928Z"
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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": "2025-11-03T20:53:52.637Z"
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}
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} |