{"id":"CVE-2026-98062","state":"PUBLISHED","title":"bpf: Mark signal tracepoint siginfo arguments as scalar","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark signal tracepoint siginfo arguments as scalar\n\nThe signal_generate and signal_deliver tracepoints declare their info\nargument as a struct kernel_siginfo pointer. btf_ctx_access() therefore\ntreats it as a trusted pointer for tp_btf programs.\n\nSignal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special\nvalues for this argument. Those values are zero and one respectively,\nand are not pointers. A tp_btf program can currently dereference either\nvalue and fault the kernel. In particular, signal_generate can run from\ntimer interrupt context, turning the fault into a kernel panic.\n\nRecord both tracepoints in raw_tp_null_args[] and mark argument one as\na non-pointer. This preserves scalar access to the cookie while rejecting\ndirect and helper-mediated pointer use. Merely marking it nullable would\nnot suffice because SEND_SIG_PRIV is nonzero.","publishedAt":"2026-09-25T10:24:06.597Z","updatedAt":"2026-10-21T12:54:20.506Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b2fc4b17fc13810ef440fb323fad3981cd174985","status":"affected","lessThan":"05757377fa0447163d07c43a119f81abe1eef8dc","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"0e78cb242a57e481061fcb542fed4d51afba25c4","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"d2eaea3599bcce659ce91862254dc91bcbdb6351","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"77515ab12e4983e6416f8c35039a3f0c0822ac70","versionType":"git"},{"version":"6.12.6","status":"affected","lessThan":"6.12.114","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"]}],"references":["https://git.kernel.org/stable/c/05757377fa0447163d07c43a119f81abe1eef8dc","https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4","https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351","https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98062.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98062","state":"PUBLISHED","datePublished":"2026-09-25T10:24:06.597Z","dateUpdated":"2026-10-21T12:54:20.506Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.073Z"},"containers":{"cna":{"title":"bpf: Mark signal tracepoint siginfo arguments as scalar","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark signal tracepoint siginfo arguments as scalar\n\nThe signal_generate and signal_deliver tracepoints declare their info\nargument as a struct kernel_siginfo pointer. btf_ctx_access() therefore\ntreats it as a trusted pointer for tp_btf programs.\n\nSignal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special\nvalues for this argument. Those values are zero and one respectively,\nand are not pointers. A tp_btf program can currently dereference either\nvalue and fault the kernel. In particular, signal_generate can run from\ntimer interrupt context, turning the fault into a kernel panic.\n\nRecord both tracepoints in raw_tp_null_args[] and mark argument one as\na non-pointer. This preserves scalar access to the cookie while rejecting\ndirect and helper-mediated pointer use. Merely marking it nullable would\nnot suffice because SEND_SIG_PRIV is nonzero."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b2fc4b17fc13810ef440fb323fad3981cd174985","status":"affected","lessThan":"05757377fa0447163d07c43a119f81abe1eef8dc","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"0e78cb242a57e481061fcb542fed4d51afba25c4","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"d2eaea3599bcce659ce91862254dc91bcbdb6351","versionType":"git"},{"version":"838a10bd2ebfe11a60dd67687533a7cfc220cc86","status":"affected","lessThan":"77515ab12e4983e6416f8c35039a3f0c0822ac70","versionType":"git"},{"version":"6.12.6","status":"affected","lessThan":"6.12.114","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/05757377fa0447163d07c43a119f81abe1eef8dc"},{"url":"https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4"},{"url":"https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351"},{"url":"https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:54:20.506Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.6","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}