SB20260424207 - Use-after-free in Linux kernel packet
Published: April 24, 2026
Security Bulletin ID
SB20260424207
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-2026-31504)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 a use-after-free in packet_release() and fanout group handling when processing a concurrent NETDEV_UP event during socket release. A local user can trigger a race condition to cause a denial of service.
The issue affects fanout sockets during a race that can leave a dangling pointer in the fanout array.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1b4c03f8892d955385c202009af7485364731bb9
- https://git.kernel.org/stable/c/42156f93d123436f2a27c468f18c966b7e5db796
- https://git.kernel.org/stable/c/42cfd7898eeed290c9fb73f732af1f7d6b0a703e
- https://git.kernel.org/stable/c/654386baef228c2992dbf604c819e4c7c35fc71b
- https://git.kernel.org/stable/c/75fe6db23705a1d55160081f7b37db9665b1880b
- https://git.kernel.org/stable/c/ceccbfc6de720ad633519a226715989cfb065af1
- https://git.kernel.org/stable/c/d0c7cdc15fdf8c4f91aca1928e52295d175b6ec6
- https://git.kernel.org/stable/c/ee642b1962caa9aa231c01abbd58bc453ae6b66e