CVE-2026-98800: Linux kernel · bpf: Wait for an RCU tasks grace period before freeing trampoline progs
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 40955f6512a03f0e046f5256b0706b26ba191018 : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:16 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 40955f6512a03f0e046f5256b0706b26ba191018, 5.12, 5.11 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 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
Upgrade Linux to 40955f6512a03f0e046f5256b0706b26ba191018, 5.12, 5.11 or 0fb5751a6e411b1b466c06e50021818d9391df98; the Red Hat redhat/kernel package to 5.12 or 5.11.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
Red Hatredhat/kernelpkg:rpm/redhat/kernelOther 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
Upgrade to Linux kernel versions 5.11, 5.12, or later where the fix is applied. The fix involves waiting for an RCU tasks grace period before freeing trampoline programs to prevent use-after-free conditions. No additional mitigation is required beyond applying the official kernel update.
Description
A use-after-free vulnerability in the Linux kernel's BPF trampoline program handling was fixed by ensuring that freeing trampoline programs waits for an RCU tasks grace period. This prevents tasks that were preempted in the trampoline from accessing freed memory, which could cause kernel crashes or memory corruption.