Critical 9.8Published Jun 24, 2026

CVE-2026-52993tipc: fix double-free in tipc_buf_append()

Updated under an hour ago (Oct 28, 2026, 6:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-763
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d618d09a68e4eed7a435beb2e355250f6f40664a before a438975a6dcdbd70865978c021650d1485586f0b; from d618d09a68e4eed7a435beb2e355250f6f40664a before 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0; from d618d09a68e4eed7a435beb2e355250f6f40664a before d3556656c6daebf8def751c7e71d11dd0a180d24; from d618d09a68e4eed7a435beb2e355250f6f40664a before 0274f24485fc38032d4093e463dc3ff5c7a667c9; from d618d09a68e4eed7a435beb2e355250f6f40664a before 4d104882bc815d4ec666ace9155f5f52715879a6; from d618d09a68e4eed7a435beb2e355250f6f40664a before 1d5e589055880fae229e229e1929e087dbe08cf3; from d618d09a68e4eed7a435beb2e355250f6f40664a before 29940fff14110ca48c5ccc168d121665b51bb778; from d618d09a68e4eed7a435beb2e355250f6f40664a before d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:6.12.0-211.40.1.el10_2 not affected	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.15 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b	patch
https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0	patch
https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24	patch
https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9	patch
https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6	patch
https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3	patch
https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778	patch
https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a	patch
https://access.redhat.com/errata/RHSA-2026:45115
https://access.redhat.com/errata/RHSA-2026:45116
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.