CVE-2026-97944: Linux kernel · x86/cfi: Fix FineIBT hash offset in cfi_get_func_hash()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · 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.
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 for this vulnerability has been implemented in the Linux kernel by correcting the FineIBT hash offset in cfi_get_func_hash(). Users should apply the updated kernel versions containing this fix. No alternative mitigations are indicated.
Description
A vulnerability in the Linux kernel's x86 Control Flow Integrity (CFI) implementation related to FineIBT hash offset handling has been fixed. The issue was caused by an incorrect offset used in the cfi_get_func_hash() function, leading to a mismatch in the hash read from the FineIBT preamble. This caused the kernel to fail CFI checks and crash when making the first indirect call into a BPF struct_ops program, such as during TCP congestion control initialization. The fix aligns the offset definitions to ensure consistent hash reading.
References
- ubuntu.com/security/CVE-2026-97944 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97944 (opens in a new tab)
- git.kernel.org/stable/c/67cf94c30a8b5ebc839f282f5c5a522b35903524 (opens in a new tab)
- git.kernel.org/stable/c/cd9b4595d6283f9b8a35d7ae607508de45a351ce (opens in a new tab)
- git.kernel.org/stable/c/5a5d26f2cfe13467166219f6bf58099326912ddb (opens in a new tab)