159 lines
8.2 KiB
JSON
159 lines
8.2 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-2026-45951",
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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": "2026-05-13T15:03:33.088Z",
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"datePublished": "2026-05-27T12:18:07.255Z",
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"dateUpdated": "2026-08-05T12:28:53.157Z"
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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": "2026-08-05T12:28:53.157Z"
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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 a potential use-after-free of BTF object\n\nRefcounting in the check_pseudo_btf_id() function is incorrect:\nthe __check_pseudo_btf_id() function might get called with a zero\nrefcounted btf. Fix this, and patch related code accordingly.\n\nv3: rephrase a comment (AI)\nv2: fix a refcount leak introduced in v1 (AI)"
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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 only through the local bpf() syscall (BPF_PROG_LOAD verifying a BPF_PSEUDO_BTF_ID ldimm64 instruction); there is no network, adjacent, or physical input path.\nAC:L - Triggering the UAF requires racing a concurrent close of the BTF fd against the verifier, but the attacker controls both sides (loading thread and closing thread) and can retry/heap-spray indefinitely, so per kernel guidance an attacker-created race is Low.\nPR:L - Obtaining a BTF fd (BPF_BTF_LOAD) and loading the program both require CAP_BPF, which can be delegated to a non-init user namespace via BPF token/bpffs in reasonable container deployments, making this reachable to a non-host-root local user.\nUI:N - The attacker performs the entire attack themselves by issuing bpf() syscalls and closing the fd; no victim action is required.\nS:U - The use-after-free and its consequences are confined to the kernel's own memory and security authority; no boundary such as VM or IOMMU is crossed.\nC:H - The freed BTF object is dereferenced (type/name/kallsyms lookups) and can be reallocated with attacker-controlled data, giving a kernel-memory read primitive characteristic of a use-after-free.\nI:H - The UAF causes a refcount increment on freed memory and stores a dangling btf pointer into env->used_btfs[] that is used later, enabling heap grooming and type confusion that can be leveraged into a write/control-flow primitive.\nA:H - Dereferencing the freed BTF object reliably crashes the kernel (oops/panic), so availability impact is High."
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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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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "76145f7255326761dafb76721a785799d8a00d5f",
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"lessThan": "eac65c272f3b49021a843cba5107d63627395e0e",
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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": "76145f7255326761dafb76721a785799d8a00d5f",
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"lessThan": "9ff46ffeecdb1802d6e26183177935b948a12e7f",
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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": "76145f7255326761dafb76721a785799d8a00d5f",
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"lessThan": "ccd2d799ed4467c07f5ee18c2f5c59bcc990822c",
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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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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.18.14",
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"lessThanOrEqual": "6.18.*",
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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": "6.19.4",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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": "6.14",
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"versionEndExcluding": "6.18.14"
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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": "6.14",
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"versionEndExcluding": "6.19.4"
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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": "6.14",
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"versionEndExcluding": "7.0"
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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/eac65c272f3b49021a843cba5107d63627395e0e"
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},
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{
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"url": "https://git.kernel.org/stable/c/9ff46ffeecdb1802d6e26183177935b948a12e7f"
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},
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{
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"url": "https://git.kernel.org/stable/c/ccd2d799ed4467c07f5ee18c2f5c59bcc990822c"
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}
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],
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"title": "bpf: Fix a potential use-after-free of BTF object",
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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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} |