VulnerabilityPublished 11 Sep 2026Updated 10 Nov 2026

CVE-2026-89556: Linux kernel · module: validate string table section types

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e4496dda2c6d0acf7ba5fbce14a2723a8935ceee : update Linux kernel when convenient.

Data as of 10 Nov 2026, 18:19 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in e4496dda2c6d0acf7ba5fbce14a2723a8935ceee, db07e9b0320e480f05f5c12e8e4d6699f0d3acb7, 50d0aa7d25ba4bc3606f150cd69755068e79f97f +1

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to e4496dda2c6d0acf7ba5fbce14a2723a8935ceee, db07e9b0320e480f05f5c12e8e4d6699f0d3acb7, 50d0aa7d25ba4bc3606f150cd69755068e79f97f or 9a5ff45689329835f874cefe5174e577d141d423.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c92aab819d56d51631f0484ed7af11d9d8ff4cb0, < e4496dda2c6d0acf7ba5fbce14a2723a8935ceee	Fixed in e4496dda2c6d0acf7ba5fbce14a2723a8935ceee
LinuxLinux	Affected ≥ f19f1a1c5fe56274e95b342e8138f4b774febf97, < db07e9b0320e480f05f5c12e8e4d6699f0d3acb7	Fixed in db07e9b0320e480f05f5c12e8e4d6699f0d3acb7
LinuxLinux	Affected ≥ c92aab819d56d51631f0484ed7af11d9d8ff4cb0, < 50d0aa7d25ba4bc3606f150cd69755068e79f97f	Fixed in 50d0aa7d25ba4bc3606f150cd69755068e79f97f
LinuxLinux	Affected ≥ c92aab819d56d51631f0484ed7af11d9d8ff4cb0, < 9a5ff45689329835f874cefe5174e577d141d423	Fixed in 9a5ff45689329835f874cefe5174e577d141d423
LinuxLinux	Affected =6.13	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: module: validate string table section types In elf_validity_cache_sechdrs, section sizes and offsets are validated, unless the section type is SHT_NULL or SHT_NOBITS. Later, elf_validity_cache_secstrings and elf_validity_cache_index_str access the section name table (.shstrtab) and symbol string table (.strtab) headers without first ensuring that their types are SHT_STRTAB. If a section type is SHT_NULL or SHT_NOBITS, sh_offset has not been validated and may reference out-of-bounds memory when dereferenced in elf_validity_cache_secstrings or elf_validity_cache_strtab. Validate that both string section headers are of type SHT_STRTAB before caching them.

References

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