CVE-2026-98059

bpf: Mark sched_process_wait argument as nullable

State: Published
Severity: Not scored
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Mark sched_process_wait argument as nullable

do_wait() passes wo->wo_pid to the sched_process_wait tracepoint. kernel_wait4() leaves wo_pid NULL for wait4(-1), and kernel_waitid_prepare() does likewise for waitid(P_ALL).

btf_ctx_access() currently types argument 0 as PTR_TO_BTF_ID | PTR_TRUSTED. Without PTR_MAYBE_NULL, the verifier accepts an unchecked dereference. Trusted pointer loads have no fault protection, so a wait for any child can then cause a NULL pointer dereference in JITed BPF code.

Add sched_process_wait to raw_tp_null_args[] with argument 0 marked nullable. The verifier rejects an unchecked dereference while preserving access after the program checks the pointer for NULL.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b2fc4b17fc13810ef440fb323fad3981cd174985 to before bee862c79cb7e0e5c33b2df2e3a31d164705120dAffected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before 3c03a1b8ded858685a73c1ba4080adef99db4544Affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before b9205e936dde9a94e93376c8de6195b740bcd5d2Affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before a453d6e3b8e8e1a321c8744d6189d763af9287d0Affected 6.12.6 to before 6.12.111Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

b2fc4b17fc13810ef440fb323fad3981cd174985 to before bee862c79cb7e0e5c33b2df2e3a31d164705120dAffected
838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before 3c03a1b8ded858685a73c1ba4080adef99db4544Affected
838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before b9205e936dde9a94e93376c8de6195b740bcd5d2Affected
838a10bd2ebfe11a60dd67687533a7cfc220cc86 to before a453d6e3b8e8e1a321c8744d6189d763af9287d0Affected
6.12.6 to before 6.12.111Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

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