CVE-2026-89519 (GCVE-0-2026-89519)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return
SCX_RQ_BAL_KEEP tells the pick to keep running the previous task, a leftover
from when balancing and picking were separate operations. An rq-level flag
only works while dispatches and picks pair up one to one, which core
scheduling breaks: selections interleave through dispatch's lock drops and a
pick can consume a stale flag, keeping a task that has since been dequeued.
Fixing core scheduling support requires the decision to travel with the
dispatch that made it. Make scx_dispatch_sched() and balance_one() return an
explicit verdict instead and drop the flag's plumbing from the tools autogen
enum headers.
Also factor the pick-side invocation, its follow-up queueing and the
post-dispatch checks out of do_pick_task_scx() into dispatch_pick(). No
functional changes intended.
v2: Drop the SCX_RQ_BAL_KEEP plumbing from the tools autogen enum headers
as well (Andrea).
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/sched.h",
"tools/sched_ext/include/scx/enum_defs.autogen.h",
"tools/sched_ext/include/scx/enums.autogen.bpf.h",
"tools/sched_ext/include/scx/enums.autogen.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "6f1d3bfe54430f8d54e0530a27f2ecbf8466576e",
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"version": "4c95380701f58b8112f0b891de8d160e4199e19d",
"versionType": "git"
},
{
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"status": "affected",
"version": "4c95380701f58b8112f0b891de8d160e4199e19d",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/sched.h",
"tools/sched_ext/include/scx/enum_defs.autogen.h",
"tools/sched_ext/include/scx/enums.autogen.bpf.h",
"tools/sched_ext/include/scx/enums.autogen.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.19"
},
{
"lessThan": "6.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return\n\nSCX_RQ_BAL_KEEP tells the pick to keep running the previous task, a leftover\nfrom when balancing and picking were separate operations. An rq-level flag\nonly works while dispatches and picks pair up one to one, which core\nscheduling breaks: selections interleave through dispatch\u0027s lock drops and a\npick can consume a stale flag, keeping a task that has since been dequeued.\nFixing core scheduling support requires the decision to travel with the\ndispatch that made it. Make scx_dispatch_sched() and balance_one() return an\nexplicit verdict instead and drop the flag\u0027s plumbing from the tools autogen\nenum headers.\n\nAlso factor the pick-side invocation, its follow-up queueing and the\npost-dispatch checks out of do_pick_task_scx() into dispatch_pick(). No\nfunctional changes intended.\n\nv2: Drop the SCX_RQ_BAL_KEEP plumbing from the tools autogen enum headers\n as well (Andrea)."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:48:10.533Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6f1d3bfe54430f8d54e0530a27f2ecbf8466576e"
},
{
"url": "https://git.kernel.org/stable/c/ffaab58d217581cb75353168f8812a16e10463fc"
}
],
"title": "sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89519",
"datePublished": "2026-09-11T19:44:01.858Z",
"dateReserved": "2026-09-11T19:38:34.718Z",
"dateUpdated": "2026-10-19T08:48:10.533Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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