CVE-2026-98059 PUBLISHED

bpf: Mark sched_process_wait argument as nullable

Assigner: Linux
Reserved: 25.09.2026 Published: 25.09.2026 Updated: 25.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from b2fc4b17fc13810ef440fb323fad3981cd174985 to bee862c79cb7e0e5c33b2df2e3a31d164705120d (excl.)
  • affected from 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to 3c03a1b8ded858685a73c1ba4080adef99db4544 (excl.)
  • affected from 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to b9205e936dde9a94e93376c8de6195b740bcd5d2 (excl.)
  • affected from 838a10bd2ebfe11a60dd67687533a7cfc220cc86 to a453d6e3b8e8e1a321c8744d6189d763af9287d0 (excl.)
  • affected from 6.12.6 to 6.12.111 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.13 is affected
  • unaffected from 0 to 6.13 (excl.)
  • unaffected from 6.12.111 to 6.12.* (incl.)
  • unaffected from 6.18.53 to 6.18.* (incl.)
  • unaffected from 7.2.7 to 7.2.* (incl.)
  • unaffected from 7.3-rc2 to * (incl.)

References