bpf: Mark signal tracepoint siginfo arguments as scalar

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98062
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:35 UTC
Updated2026-09-30 14:10:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Mark signal tracepoint siginfo arguments as scalar The signal_generate and signal_deliver tracepoints declare their info argument as a struct kernel_siginfo pointer. btf_ctx_access() therefore treats it as a trusted pointer for tp_btf programs. Signal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special values for this argument. Those values are zero and one respectively, and are not pointers. A tp_btf program can currently dereference either value and fault the kernel. In particular, signal_generate can run from timer interrupt context, turning the fault into a kernel panic. Record both tracepoints in raw_tp_null_args[] and mark argument one as a non-pointer. This preserves scalar access to the cookie while rejecting direct and helper-mediated pointer use. Merely marking it nullable would not suffice because SEND_SIG_PRIV is nonzero.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.051940000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 0e78cb242a57e481061fcb542fed4d51afba25c4 git Not specified
CNA Linux Linux affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 d2eaea3599bcce659ce91862254dc91bcbdb6351 git Not specified
CNA Linux Linux affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 77515ab12e4983e6416f8c35039a3f0c0822ac70 git Not specified
CNA Linux Linux affected b2fc4b17fc13810ef440fb323fad3981cd174985 git Not specified
CNA Linux Linux affected 6.12.6 6.13 semver Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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