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CVE-2026-45893: apparmor: Fix & Optimize table creation from possibly unaligned memory

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-30
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix & Optimize table creation from possibly unaligned memory Source blob may come from userspace and might be unaligned. Try to optize the copying process by avoiding unaligned memory accesses. - Added Fixes tag - Added "Fix &" to description as this doesn't just optimize but fixes a potential unaligned memory access [jj: remove duplicate word "convert" in comment trigger checkpatch warning]

Affected products

• Linux kernel: from 4.11 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4 — fixed in 6.12.75, 6.18.14, 6.19.4
• Linux: 4.11 — fixed in 7.0

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.14, 6.19.4; Linux 7.0. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1fbc4b24c7443ffd501609be74d9856fb940d703
• https://git.kernel.org/stable/c/226c3b10aab23f73b03c47e7773107de56ba3a4e
• https://git.kernel.org/stable/c/47e351dfef60ab0e3285133556e1a9c7f646a969
• https://git.kernel.org/stable/c/6fc367bfd4c8886e6b1742aabbd1c0bdc310db3a
• https://git.kernel.org/stable/c/83939c2afba70b49062c31ca6a6de7f46951d26d
• https://git.kernel.org/stable/c/e027999049c493fb728ead5a90db76942181a935

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