GHSA-MFRQ-H74G-92W2
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98059"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:34Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark sched_process_wait argument as nullable\n\ndo_wait() passes wo-\u003ewo_pid to the sched_process_wait tracepoint.\nkernel_wait4() leaves wo_pid NULL for wait4(-1), and\nkernel_waitid_prepare() does likewise for waitid(P_ALL).\n\nbtf_ctx_access() currently types argument 0 as PTR_TO_BTF_ID |\nPTR_TRUSTED. Without PTR_MAYBE_NULL, the verifier accepts an unchecked\ndereference. Trusted pointer loads have no fault protection, so a wait for\nany child can then cause a NULL pointer dereference in JITed BPF code.\n\nAdd sched_process_wait to raw_tp_null_args[] with argument 0 marked\nnullable. The verifier rejects an unchecked dereference while preserving\naccess after the program checks the pointer for NULL.",
"id": "GHSA-mfrq-h74g-92w2",
"modified": "2026-09-25T12:31:34Z",
"published": "2026-09-25T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98059"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3c03a1b8ded858685a73c1ba4080adef99db4544"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a453d6e3b8e8e1a321c8744d6189d763af9287d0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9205e936dde9a94e93376c8de6195b740bcd5d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bee862c79cb7e0e5c33b2df2e3a31d164705120d"
}
],
"schema_version": "1.4.0",
"severity": []
}
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