perf/core: Fix group leader use-after-free after sibling detach
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix group leader use-after-free after sibling detach perf_group_detach() handles leader and sibling detach differently. When the group leader is detached, all siblings are promoted to singleton events and their group_leader pointer is reset to themselves. When a sibling is detached, it is removed from the leader's sibling_list, but its group_leader pointer is left pointing at the old leader. That is harmless when the sibling is being closed and freed immediately, as in the DETACH_DEAD path. It is not safe when the sibling is detached but kept alive, such as during CPU hotplug with DETACH_GROUP. In that case the sibling is removed from the context, while its file descriptor can still keep it alive. A typical failing sequence is: - A group contains leader L and sibling S. - CPU hot-unplug detaches S with DETACH_GROUP, removing it from L->sibling_list but leaving S->group_leader == L. - L is later closed and freed. - A PERF_IOC_FLAG_GROUP ioctl on S follows S->group_leader and dereferences the freed leader. This was reproduced by running the perf event fuzzer, CPU hotplug, and a stress workload concurrently: Unable to handle kernel paging request at virtual address 006b6b6b6b6b6cdb CPU: 2 PID: 12489 Comm: perf_fuzzer 6.18.7 PREEMPT pc : perf_ioctl+0x34c/0xc68 x20: ffffff89a3fa2c70 x8 : 6b6b6b6b6b6b6b6b Code: 943c4a0e 340047a0 f9404a94 f9411e88 (f940b908) Call trace: perf_ioctl+0x34c/0xc68 (P) __arm64_
CVE-2026-74637
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-2026-74637
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": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "8f867c0e8da4c2303d91adf45acb6b1820966c27",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "8e92e03984364d93e0d5b0acd81c95eca773f034",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "f8a07021679aadfb6d63b209207ccc41f26982d1",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "80c6054a4c40a0ffad82acef9f9a0dee108d152a",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "b42948f9e0d1ea4dbd5742ce1dfc7688de5d4a35",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "a979a642402d0b1f856c7a729b4cb2d92de4cf2f",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "1e7abfeb23c12bf46f6457e4a3e1a1a300d50619",
"versionType": "git"
},
{
"status": "affected",
"version": "8a49542c0554af7d0073aac0ee73ee65b807ef34",
"lessThan": "42c5ca1f0a288a52878bd72a5595b08261057438",
"versionType": "git"
},
{
"status": "affected",
"version": "e732ebc42aea321ee84514330eb3a675307fcc83",
"versionType": "git"
},
{
"status": "affected",
"version": "2.6.34.14",
"lessThan": "2.6.35",
"versionType": "semver"
}
],
"programFiles": [
"kernel/events/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.35"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.35",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/events/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74637
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34253 · Revision 1
- Added to Heist Feed
- Publisher date