CVE-2026-52993
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
In the Linux kernel, a double-free vulnerability in tipc_buf_append() due to tipc_msg_validate() reallocating the buffer. This can lead to memory corruption and potentially privilege escalation.
Risk Assessment
Risk of system crash or privilege escalation by a local attacker.
Recommendation
Apply the Linux kernel patch that fixes this bug.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a pointer to a local variable which was a copy of the caller's skb pointer. If the skb was reallocated and validation subsequently failed, the error handling path would free the original skb pointer, which had already been freed, leading to double-free. Fix this by checking if head now points to a newly allocated reassembled skb. If it does, reassign *headbuf for later freeing operations.