CVE-2026-98059: Linux kernel · bpf: Mark sched_process_wait argument as nullable
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to mark the sched_process_wait argument as nullable, preventing unchecked NULL pointer dereferences in BPF programs. Users should apply the official kernel updates that include this fix. Since this is a kernel-level issue, upgrading to patched kernel versions is the recommended mitigation.
Description
A vulnerability in the Linux kernel's BPF subsystem was resolved by marking the sched_process_wait argument as nullable. The issue involved the kernel passing a potentially NULL pointer (wo_pid) to the sched_process_wait tracepoint without proper verification, allowing a NULL pointer dereference in JITed BPF code. This could occur when waiting for any child process using wait4(-1) or waitid(P_ALL). The fix ensures the verifier rejects unchecked dereferences while allowing safe access after NULL checks.
References
- ubuntu.com/security/CVE-2026-98059 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98059 (opens in a new tab)
- git.kernel.org/stable/c/bee862c79cb7e0e5c33b2df2e3a31d164705120d (opens in a new tab)
- git.kernel.org/stable/c/3c03a1b8ded858685a73c1ba4080adef99db4544 (opens in a new tab)
- git.kernel.org/stable/c/b9205e936dde9a94e93376c8de6195b740bcd5d2 (opens in a new tab)
- git.kernel.org/stable/c/a453d6e3b8e8e1a321c8744d6189d763af9287d0 (opens in a new tab)