Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-74704
Published: August 24, 2026
Vulnerability identifier: #VU144620
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74704
CWE-ID: CWE-703
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of malformed packets in sch_cake ACK filter when parsing malformed IP headers. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue may result in warning log flooding, or a kernel panic when panic_on_warn is enabled.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74704
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/0c4882bff34558d8d53fb04c3e96da5c327c7dc8
- https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458
- https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3
- https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d
- https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a
- https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3
- https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235
- https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734