9.8 Critical

CVE-2026-52993 In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append()…

Description

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.

Affected products and versions

Product	Affected versions	Fixed in
Linux 7.1	earliest → < 7.1	7.1
Linux 7.0	earliest → < 7.0.10	7.0.10
Linux 6.18	earliest → < 6.18.33	6.18.33
Linux 6.12	earliest → < 6.12.91	6.12.91
Linux 6.6	earliest → < 6.6.141	6.6.141
Linux 6.1	earliest → < 6.1.175	6.1.175
Linux 5.15	earliest → < 5.15.209	5.15.209
Linux 5.10	earliest → < 5.10.258	5.10.258
Linux	4.15	No fix stated

Show the 5 other branches

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat Enterprise Linux 6	Versions not published
Red Hat Enterprise Linux 7	Versions not published