🔐 CVE Alert

CVE-2026-52993

CRITICAL 9.8

tipc: fix double-free in tipc_buf_append()

CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor linux
Product linux
Ecosystems
Industries
Technology
Published Jun 24, 2026
Last Updated Jun 30, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability

Affected Versions

Linux / Linux
d618d09a68e4eed7a435beb2e355250f6f40664a < a438975a6dcdbd70865978c021650d1485586f0b d618d09a68e4eed7a435beb2e355250f6f40664a < 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 d618d09a68e4eed7a435beb2e355250f6f40664a < d3556656c6daebf8def751c7e71d11dd0a180d24 d618d09a68e4eed7a435beb2e355250f6f40664a < 0274f24485fc38032d4093e463dc3ff5c7a667c9 d618d09a68e4eed7a435beb2e355250f6f40664a < 4d104882bc815d4ec666ace9155f5f52715879a6 d618d09a68e4eed7a435beb2e355250f6f40664a < 1d5e589055880fae229e229e1929e087dbe08cf3 d618d09a68e4eed7a435beb2e355250f6f40664a < 29940fff14110ca48c5ccc168d121665b51bb778 d618d09a68e4eed7a435beb2e355250f6f40664a < d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a
Linux / Linux
4.15

References

NVD ↗ CVE.org ↗ EPSS Data ↗
git.kernel.org: https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b git.kernel.org: https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 git.kernel.org: https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24 git.kernel.org: https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9 git.kernel.org: https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6 git.kernel.org: https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3 git.kernel.org: https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778 git.kernel.org: https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-52993 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2492437 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52993.json