Use-after-free in Linux kernel - CVE-2026-74588

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

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.

Linux kernel
Debian Linux
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-331.0.0.232
bpftool - update to 5.10.0-331.0.0.232
bpftool-debuginfo - update to 5.10.0-331.0.0.232
kernel-debuginfo - update to 5.10.0-331.0.0.232
kernel-debugsource - update to 5.10.0-331.0.0.232
kernel-devel - update to 5.10.0-331.0.0.232
kernel-headers - update to 5.10.0-331.0.0.232
kernel-source - update to 5.10.0-331.0.0.232
kernel-tools - update to 5.10.0-331.0.0.232
kernel-tools-debuginfo - update to 5.10.0-331.0.0.232
kernel-tools-devel - update to 5.10.0-331.0.0.232
perf - update to 5.10.0-331.0.0.232
perf-debuginfo - update to 5.10.0-331.0.0.232
python3-perf - update to 5.10.0-331.0.0.232
python3-perf-debuginfo - update to 5.10.0-331.0.0.232
linux (Debian package) - update to 6.12.105-1

• 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

• Use-after-free in Linux kernel sctp
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel