tipc: fix double-free in tipc_buf_append()
Summary
| CVE | CVE-2026-52993 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 17:17:10 UTC |
| Updated | 2026-06-24 17:17:10 UTC |
| 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. |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.073550000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a a438975a6dcdbd70865978c021650d1485586f0b git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a d3556656c6daebf8def751c7e71d11dd0a180d24 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a 0274f24485fc38032d4093e463dc3ff5c7a667c9 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a 4d104882bc815d4ec666ace9155f5f52715879a6 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a 1d5e589055880fae229e229e1929e087dbe08cf3 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a 29940fff14110ca48c5ccc168d121665b51bb778 git | Not specified |
| CNA | Linux | Linux | affected d618d09a68e4eed7a435beb2e355250f6f40664a d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a git | Not specified |
| CNA | Linux | Linux | affected 4.15 | Not specified |
| CNA | Linux | Linux | unaffected 4.15 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.258 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.141 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.91 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.33 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.10 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.