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CVE-2026-80755

Unknown

Last modified

CVE-2026-80755 is a vulnerability of currently unknown severity. 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.

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]

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 6c2ab7c4549f4f2305848df834e784651dbf1676; >= 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < dfc59a062c386d3d4415ecdab781065a645f33cc; >= 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e; >= 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < d14b5d0e97fccd27974fedc03b903408872907fd
LinuxLinux2.6.23

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80755?
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]
How severe is CVE-2026-80755?
Severity scoring for CVE-2026-80755 is pending analysis.
How do I fix CVE-2026-80755?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST