SB2026050613 - Use-after-free in Linux kernel netfilter
Published: May 6, 2026
Security Bulletin ID
SB2026050613
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-43060)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in nft_ct when removing referenced conntrack objects while packets remain enqueued in nfqueue. A local user can trigger processing of packets that retain stale references to cause a denial of service.
The issue involves references to conntrack zone templates, timeout policies, or helpers held by queued packets.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/36eae0956f659e48d5366d9b083d9417f3263ddc
- https://git.kernel.org/stable/c/3da0b946835f33bf36b459ead764c61a761e689b
- https://git.kernel.org/stable/c/6802ff8beceb9c4254318e81c1395720438f2cc2
- https://git.kernel.org/stable/c/77da55dee67720e2b8d2db49a53334e6c017ee7b
- https://git.kernel.org/stable/c/8a64e76933672b08bd85b63086f33432070fd729
- https://git.kernel.org/stable/c/ab50302190b303f847c4eba0e31a01a56dec596e
- https://git.kernel.org/stable/c/e68a8db3a0546482b34e9ca5ca886bcf73eb37bb
- https://git.kernel.org/stable/c/f29a055e4f593e577805b41228b142b58f48df1b