Use-after-free in Linux kernel - CVE-2026-74588
Published: August 24, 2026
Vulnerability identifier: #VU144979
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74588
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a use-after-free in __sctp_outq_flush_rtx() and SCTP transport tracking when processing SCTP SACKs after transport removal. A remote user can send crafted SCTP control traffic to cause a denial of service.
Exploitation requires an SCTP association peer to trigger transport removal through ASCONF Delete-IP and then send a SACK that reneges on the TSN.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74588
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/1adf929121e13e0b19200bb9fef715b918d483fe
- https://git.kernel.org/stable/c/2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d
- https://git.kernel.org/stable/c/5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b
- https://git.kernel.org/stable/c/6575fb17230814b48b471727c8410c0aadff9274
- https://git.kernel.org/stable/c/6b9e2ea2057113f3393990ba646d2d97c719a80d
- https://git.kernel.org/stable/c/874a7c2b5e184f06134fdfde27e9ce9271bafe58
- https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749
- https://git.kernel.org/stable/c/e2e7c1de0e226ca1b7fea2de57a6c9bca408709b