Race condition in Linux kernel - CVE-2026-74748
Published: August 27, 2026
Vulnerability identifier: #VU145984
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74748
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in __ip_set_put_byindex() in the netfilter ipset subsystem when list:set garbage collection and set swap operations occur concurrently. A local user can trigger concurrent ipset operations to cause a denial of service.
The issue can lead to a kernel BUG and panic from timer softirq context.
Affected software
Linux kernel
How to mitigate CVE-2026-74748
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0c88868271653537ed443272dd8e7d13634d214b
- https://git.kernel.org/stable/c/20cb13a523f0a05cb2d0a7d72abae687683712e0
- https://git.kernel.org/stable/c/24ffcb1e1688c55fd2a505f064295cd28eac546d
- https://git.kernel.org/stable/c/97a01de0c6321b7210d30d0a4d60f10f561097c7
- https://git.kernel.org/stable/c/b0aab9dd1a348b99d75ff52765719d0cc2050630
- https://git.kernel.org/stable/c/b891e7a6bb06e0f6560e5932665ac660acd12225
- https://git.kernel.org/stable/c/c21afc7c216a4d257a4f3f300e0791890bc846b9
- https://git.kernel.org/stable/c/cb20da33839f28f590c99f16bafaa6151451c0e8