Answer in brief
CVE-2026-52993 records a Critical severity (CVSS 9.8) vulnerability in tipc: fix double-free in tipc_buf_append(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-52993 records a Critical severity (CVSS 9.8) vulnerability in tipc: fix double-free in tipc_buf_append(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d618d09a68e4eed7a435beb2e355250f6f40664a <a438975a6dcdbd70865978c021650d1485586f0b || >=d618d09a68e4eed7a435beb2e355250f6f40664a <4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <d3556656c6daebf8def751c7e71d11dd0a180d24 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <0274f24485fc38032d4093e463dc3ff5c7a667c9 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <4d104882bc815d4ec666ace9155f5f52715879a6 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <1d5e589055880fae229e229e1929e087dbe08cf3 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <29940fff14110ca48c5ccc168d121665b51bb778 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a | a438975a6dcdbd70865978c021650d1485586f0b, 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0, d3556656c6daebf8def751c7e71d11dd0a180d24, 0274f24485fc38032d4093e463dc3ff5c7a667c9, 4d104882bc815d4ec666ace9155f5f52715879a6, 1d5e589055880fae229e229e1929e087dbe08cf3, 29940fff14110ca48c5ccc168d121665b51bb778, d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d618d09a68e4eed7a435beb2e355250f6f40664a <a438975a6dcdbd70865978c021650d1485586f0b || >=d618d09a68e4eed7a435beb2e355250f6f40664a <4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <d3556656c6daebf8def751c7e71d11dd0a180d24 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <0274f24485fc38032d4093e463dc3ff5c7a667c9 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <4d104882bc815d4ec666ace9155f5f52715879a6 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <1d5e589055880fae229e229e1929e087dbe08cf3 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <29940fff14110ca48c5ccc168d121665b51bb778 || >=d618d09a68e4eed7a435beb2e355250f6f40664a <d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a | a438975a6dcdbd70865978c021650d1485586f0b, 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0, d3556656c6daebf8def751c7e71d11dd0a180d24, 0274f24485fc38032d4093e463dc3ff5c7a667c9, 4d104882bc815d4ec666ace9155f5f52715879a6, 1d5e589055880fae229e229e1929e087dbe08cf3, 29940fff14110ca48c5ccc168d121665b51bb778, d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.