VulnerabilityPublished 3 Sep 2026Updated 30 Oct 2026

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

Source GCVE Database

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Authoritative record:CVE-2026-80755· High

Not known to be exploited · fixed in dfc59a062c386d3d4415ecdab781065a645f33cc : patch Linux kernel soon.

Data as of 30 Oct 2026, 19:33 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in dfc59a062c386d3d4415ecdab781065a645f33cc, d14b5d0e97fccd27974fedc03b903408872907fd, a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e +3

Exploitation evidence

Disclosed: evidence found.
CVE published 3 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 30 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.
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.

ghsa-jcj2-5fhp-x66j

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, < 766051751cfb90fc9c29c30c2943b0f24eda9594	Fixed in 766051751cfb90fc9c29c30c2943b0f24eda9594
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 9a1bd9fd1326655dfc31b18ca92ea8433cb31204	Fixed in 9a1bd9fd1326655dfc31b18ca92ea8433cb31204
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 6c2ab7c4549f4f2305848df834e784651dbf1676	Fixed in 6c2ab7c4549f4f2305848df834e784651dbf1676

AI-suggested

A fix has been implemented that rejects permission values exceeding the class permission count (nprim) during permission reading. Users should apply the official Linux kernel updates that include this fix. Since this is a kernel-level issue, upgrading to a patched kernel version is the recommended remediation. No additional mitigations are indicated.

Description

A vulnerability in the Linux kernel's SELinux implementation allows a permission value exceeding the class permission count to be processed, leading to an out-of-bounds heap write. This occurs because perm_read() does not properly bound the permission value by the owning class's permission count (nprim), causing security_get_permissions() to write outside allocated memory. Well-formed policies are not affected by this issue.

Impact

This vulnerability can lead to an out-of-bounds heap write in the SELinux permission handling code of the Linux kernel. Such memory corruption could potentially be exploited to cause kernel instability or escalate privileges if an attacker can supply a malformed SELinux policy with permission values exceeding the declared count. However, well-formed policies are unaffected, limiting the risk to systems using malformed or malicious policies.

References

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