جزئیات آسیب‌پذیری

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.

• https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b
• https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0
• https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24
• https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9
• https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6
• https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3
• https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778
• https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a
• https://access.redhat.com/security/cve/CVE-2026-52993 vdb-entryx_refsource_REDHAT
• https://bugzilla.redhat.com/show_bug.cgi?id=2492437 issue-trackingx_refsource_REDHAT
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52993.json x_sadp-csaf-vex
• https://access.redhat.com/errata/RHSA-2026:47017 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:49212 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:45115 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:45116 vendor-advisoryx_refsource_REDHAT