sched_ext: Don't run ops.dequeue() with a DSQ lock held
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't run ops.dequeue() with a DSQ lock held ops.dequeue() is invoked with the source user DSQ's lock still held on the consume and move paths (scx_consume_dispatch_q(), move_task_between_dsqs()). A BPF scheduler which locks the source user DSQ from ops.dequeue() - e.g. by iterating it with bpf_iter_scx_dsq - self-deadlocks. ops.dequeue() can only call the "any" kfuncs and none of them can lock a builtin DSQ, so the global and bypass paths can't deadlock; however, all DSQ locks share one lockdep class, so iterating any user DSQ from ops.dequeue() on those paths trips the recursion check. Move the invocation after the DSQ unlock on all three paths. SCX_TASK_IN_CUSTODY is cleared under the lock serializing the transfer so that the callback is invoked exactly once.
CVE-2026-98865
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-2026-98865
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": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d",
"lessThan": "fe499ae9da46e297f578d4346c4c8e338c3118db",
"versionType": "git"
},
{
"status": "affected",
"version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d",
"lessThan": "cb86607ada73185f321baa7f9d94a08a3a40bbf5",
"versionType": "git"
}
],
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/ext/internal.h",
"kernel/sched/ext/sub.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/ext/internal.h",
"kernel/sched/ext/sub.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98865
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38759 · Revision 1
- Added to Heist Feed
- Publisher date