VulnerabilityPublished 3 Sep 2026Updated 21 Oct 2026

CVE-2026-80755: Linux kernel · selinux: reject a permission value exceeding the class permission count

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in dfc59a062c386d3d4415ecdab781065a645f33cc : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · 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 dfc59a062c386d3d4415ecdab781065a645f33cc, d14b5d0e97fccd27974fedc03b903408872907fd, a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e +2

Exploitation evidence

Disclosed: evidence found.
CVE published 3 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.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < dfc59a062c386d3d4415ecdab781065a645f33cc	Fixed in dfc59a062c386d3d4415ecdab781065a645f33cc
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < d14b5d0e97fccd27974fedc03b903408872907fd	Fixed in d14b5d0e97fccd27974fedc03b903408872907fd
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e	Fixed in a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 9a1bd9fd1326655dfc31b18ca92ea8433cb31204	Fixed in 9a1bd9fd1326655dfc31b18ca92ea8433cb31204
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 6c2ab7c4549f4f2305848df834e784651dbf1676	Fixed in 6c2ab7c4549f4f2305848df834e784651dbf1676
LinuxLinux	Affected =2.6.23	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: selinux: reject a permission value exceeding the class permission count perm_read() bounds a permission value by SEL_VEC_MAX but never by the nprim of the owning class or common, which is taken verbatim from the policy image. security_get_permissions() then writes perms[value - 1] into an nprim-sized kcalloc() array, so a class declaring fewer permissions than its largest permission value drives an out-of-bounds heap write. The top-level symbol tables are validated this way; the nested per-class permission table is not. Reject a permission whose value exceeds nprim, which is already set when perm_read() runs. Well-formed policies are unaffected. [PM: tweak comment for line length]

References

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