tipc: fix double-free in tipc_buf_append()
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.
CVE-2026-52993
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-52993
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "a438975a6dcdbd70865978c021650d1485586f0b",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "4ee4deadaae7cb2e3d53af0fc889cf92a73413c0",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "d3556656c6daebf8def751c7e71d11dd0a180d24",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "0274f24485fc38032d4093e463dc3ff5c7a667c9",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "4d104882bc815d4ec666ace9155f5f52715879a6",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "1d5e589055880fae229e229e1929e087dbe08cf3",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "29940fff14110ca48c5ccc168d121665b51bb778",
"versionType": "git"
},
{
"status": "affected",
"version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
"lessThan": "d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a",
"versionType": "git"
}
],
"programFiles": [
"net/tipc/msg.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/tipc/msg.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52993
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40728 · Revision 1
- Added to Heist Feed
- Publisher date