254 lines
14 KiB
JSON
254 lines
14 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-2026-92485",
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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": "2026-09-16T12:21:13.870Z",
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"datePublished": "2026-09-17T16:10:00.999Z",
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"dateUpdated": "2026-10-30T12:35:38.840Z"
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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": "2026-10-30T12:35:38.840Z"
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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 WARNING in bpf_tracing_link_release\n\nThe trampoline could be corrupted by the blindly\n'tr->flags = BPF_TRAMP_F_TAIL_CALL_CTX' in verifier.\n\n1. A fexit attached to a tail_call_reachable prog. 'tr->flags' became\n 'BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_TAIL_CALL_CTX'. And, the\n trampoline would poke the target prog's nop insn using jmp insn instead\n of call insn.\n2. Another fexit loaded with the same tail_call_reachable prog target.\n 'tr->flags' became 'BPF_TRAMP_F_TAIL_CALL_CTX'.\n3. Close the first fexit link. Due to no BPF_TRAMP_F_CALL_ORIG in\n 'tr->flags', the trampoline will fail to restore the prog's nop insn\n using call insn.\n\n[ 3.410719] WARNING: kernel/bpf/syscall.c:3551 at bpf_tracing_link_release+0x53/0x60, CPU#1: test_progs/98\n...\n[ 3.428793] bpf_link_free+0x58/0x130\n[ 3.429293] bpf_link_release+0x23/0x30\n\nFix the warning by updating 'tr->flags' with '|=' and lock."
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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 trigger is local bpf() only: BPF_PROG_LOAD of a tail_call_reachable target plus two BPF_TRACE_FEXIT programs (check_attach_btf_id overwrites tr->flags), BPF_LINK_CREATE via bpf_tracing_prog_attach, then close() of the first link into bpf_tracing_link_release. No remote protocol carries the malformed state.\nAC:L - After the first fexit attach, bpf_trampoline_update sets BPF_TRAMP_F_CALL_ORIG and bpf_arch_text_poke installs a JMP (bpf_trampoline_use_jmp). A second BPF_PROG_LOAD then does tr->flags = BPF_TRAMP_F_TAIL_CALL_CTX in check_attach_btf_id; closing the first link hits the JMP-vs-CALL mismatch. The attacker owns both loads and the close; CONFIG_DYNAMIC_FTRACE_WITH_JMP is def_bool y on x86_64.\nPR:L - bpf_prog_load() of BPF_PROG_TYPE_TRACING/BPF_TRACE_FEXIT requires CAP_BPF and, via is_perfmon_prog_type(), CAP_PERFMON; bpf_token_capable() with a delegated BPF token grants those into a non-init user namespace, so this is not init-namespace root.\nUI:N - The attacker loads both fexit programs, attaches the first with BPF_LINK_CREATE/bpf_tracing_prog_attach, and closes that link fd themselves; no victim mount, open, or other action is required.\nS:U - The leftover JMP in the target program and the use-after-free of fexit1's JIT image stay inside host kernel BPF trampoline code; they do not cross a VM, IOMMU, or sandbox boundary.\nC:H - Failed bpf_trampoline_unlink_prog() leaves the target's 5-byte slot as a JMP into the trampoline image that still calls fexit1->bpf_func, while bpf_link_free()→bpf_link_dealloc() immediately bpf_prog_put()s fexit1 (no dealloc_deferred). After bpf_jit_free(), later target invocations read that freed executable image.\nI:H - The same dangling trampoline CALL into fexit1's freed JIT pages is an executable use-after-free; the attacker controls the fexit program and can spray replacement JIT text at that address, hijacking kernel control flow when the target program runs.\nA:H - bpf_tracing_link_release() WARN_ON_ONCE()s the failed bpf_trampoline_unlink_prog() after bpf_arch_text_poke() rejects the JMP-vs-CALL restore. Running the target afterward jumps to the trampoline and calls the freed fexit JIT, causing a kernel paging fault/oops."
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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/trampoline.c",
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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": "605c8d8f9966fcd2f0b858fabebe416fc83f2209",
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"lessThan": "1757598b3804f7cb35b5b5e02558f6d8b9c2f254",
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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": "8f873cc3f67f2257493063e57d0caf07ef889ee9",
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"lessThan": "a5c6316052f0ff1467221ecf2996cbab0a496b1e",
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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": "2b5dcb31a19a2e0acd869b12c9db9b2d696ef544",
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"lessThan": "d02035c5eb4955616efc5c6dbe3d98f19d798cb2",
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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": "2b5dcb31a19a2e0acd869b12c9db9b2d696ef544",
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"lessThan": "094f0a895cf97a993d06d5dc4c12e7cb7da845a5",
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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": "2b5dcb31a19a2e0acd869b12c9db9b2d696ef544",
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"lessThan": "48a0209d8da0d90a7b0a0db19d1ff88027b13781",
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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": "2b5dcb31a19a2e0acd869b12c9db9b2d696ef544",
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"lessThan": "61aaa8782bec59ecffd22e030f54ef9351bcabf9",
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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": "028480eaf2a1401e914a1fa1a4a21d877cf0ae30",
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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": "6.1.72",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.2",
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"lessThan": "6.6.160",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.5.12",
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"lessThan": "6.6",
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"status": "affected",
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"versionType": "semver"
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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/trampoline.c",
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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": "6.7",
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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": "6.7",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.114",
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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": "6.18.57",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.72",
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"versionEndExcluding": "6.1.191"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/1757598b3804f7cb35b5b5e02558f6d8b9c2f254"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5c6316052f0ff1467221ecf2996cbab0a496b1e"
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},
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{
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"url": "https://git.kernel.org/stable/c/d02035c5eb4955616efc5c6dbe3d98f19d798cb2"
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},
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{
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"url": "https://git.kernel.org/stable/c/094f0a895cf97a993d06d5dc4c12e7cb7da845a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/48a0209d8da0d90a7b0a0db19d1ff88027b13781"
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},
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{
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"url": "https://git.kernel.org/stable/c/61aaa8782bec59ecffd22e030f54ef9351bcabf9"
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}
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],
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"title": "bpf: Fix WARNING in bpf_tracing_link_release",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |