CVE-2026-89556: Linux kernel · module: validate string table section types
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
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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. Users should apply the official kernel updates that include the validation of string section headers to ensure they are of type SHT_STRTAB before caching. Patch status is not explicitly confirmed in the provided data; therefore, users should consult the vendor or distribution advisories for the appropriate fixed kernel versions and apply updates accordingly.
Description
A vulnerability in the Linux kernel related to module string table section type validation has been resolved. The issue involves improper validation of section types in elf_validity_cache_secstrings and elf_validity_cache_strtab functions, which may lead to out-of-bounds memory references if section headers are not of type SHT_STRTAB. This flaw affects specific Linux kernel versions and has been assigned CVE-2026-89556. The severity is assessed as medium.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89556 (opens in a new tab)
- git.kernel.org/stable/c/50d0aa7d25ba4bc3606f150cd69755068e79f97f (opens in a new tab)
- git.kernel.org/stable/c/9a5ff45689329835f874cefe5174e577d141d423 (opens in a new tab)
- git.kernel.org/stable/c/e4496dda2c6d0acf7ba5fbce14a2723a8935ceee (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89556.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/CVE-2026-89556 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89556 (opens in a new tab)
- git.kernel.org/linus/9a5ff45689329835f874cefe5174e577d141d423 (opens in a new tab)