CVE-2026-98062bpf: Mark signal tracepoint siginfo arguments as scalar
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 838a10bd2ebfe11a60dd67687533a7cfc220cc86 builds before 0e78cb242a57e481061fcb542fed4d51afba25c4; from 838a10bd2ebfe11a60dd67687533a7cfc220cc86 before d2eaea3599bcce659ce91862254dc91bcbdb6351; from 838a10bd2ebfe11a60dd67687533a7cfc220cc86 before 77515ab12e4983e6416f8c35039a3f0c0822ac70; b2fc4b17fc13810ef440fb323fad3981cd174985; from 6.12.6 before 6.13 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12.6 before 6.13; from 6.13.1 before 6.18.53; from 6.19 before 7.2.7; 6.13; 6.13; 6.13; 6.13; 6.13; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4patch
- https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351patch
- https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.