CVE-2026-99079 Linux kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in net/mlx5e caused by stale XSK buffer release on refill retry in legacy cyclic RQ, letting attackers cause double publication of UMEM frames, exploit requires AF_XDP socket RX ring to be full.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for net/mlx5e stale XSK buffer release.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs