CVE-2026-52993

Vulnerability overview

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, r...

Affected product and versions

Product

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8

Affected versions

>= d618d09a68e4eed7a435beb2e355250f6f40664a < a438975a6dcdbd70865978c021650d1485586f0b, >= d618d09a68e4eed7a435beb2e355250f6f40664a < 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0, >= d618d09a68e4eed7a435beb2e355250f6f40664a < d3556656c6daebf8def751c7e71d11dd0a180d24, >= d618d09a68e4eed7a435beb2e355250f6f40664a < 0274f24485fc38032d4093e463dc3ff5c7a667c9, >= d618d09a68e4eed7a435beb2e355250f6f40664a < 4d104882bc815d4ec666ace9155f5f52715879a6, >= d618d09a68e4eed7a435beb2e355250f6f40664a < 1d5e589055880fae229e229e1929e087dbe08cf3, >= d618d09a68e4eed7a435beb2e355250f6f40664a < 29940fff14110ca48c5ccc168d121665b51bb778, >= d618d09a68e4eed7a435beb2e355250f6f40664a < d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a, >= 4.15, >= 4.15 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.141, >= 6.7 < 6.12.91, >= 6.13 < 6.18.33, >= 6.19 < 7.0.10

Fixed versions

5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-415, CWE-763