Double free in Linux kernel - CVE-2026-52993
Published: June 25, 2026
Vulnerability identifier: #VU135372
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52993
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in tipc_buf_append() when validating a reassembled skb after tipc_msg_validate() reallocates it. A local user can trigger the error-handling path with a crafted TIPC message to cause a denial of service.
How to mitigate CVE-2026-52993
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9
- https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3
- https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778
- https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6
- https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0
- https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b
- https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a
- https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24