CVE-2026-97944: Linux kernel · x86/cfi: Fix FineIBT hash offset in cfi_get_func_hash()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in cd9b4595d6283f9b8a35d7ae607508de45a351ce : patch Linux kernel soon.
Data as of 26 Oct 2026, 14:05 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 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in cd9b4595d6283f9b8a35d7ae607508de45a351ce, 67cf94c30a8b5ebc839f282f5c5a522b35903524, 5a5d26f2cfe13467166219f6bf58099326912ddb
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
Upgrade Linux kernel to cd9b4595d6283f9b8a35d7ae607508de45a351ce, 67cf94c30a8b5ebc839f282f5c5a522b35903524 or 5a5d26f2cfe13467166219f6bf58099326912ddb.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented and is available in the Linux kernel. Users should update to the fixed versions identified by the commits cd9b4595d6283f9b8a35d7ae607508de45a351ce, 67cf94c30a8b5ebc839f282f5c5a522b35903524, and 5a5d26f2cfe13467166219f6bf58099326912ddb. Applying these updates will resolve the issue.
Description
A vulnerability in the Linux kernel's x86 Control Flow Integrity (CFI) implementation related to FineIBT hash offset handling was fixed. The issue involved an incorrect offset used to read the hash in cfi_get_func_hash(), causing the BPF JIT trampoline to receive an incorrect hash. This led to kernel crashes due to CFI failures when invoking certain BPF congestion control functions.