CVE-2026-93182 (GCVE-0-2026-93182)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-10-19 09:06
VLAI
EPSS
VEX
Title
sched/fair: Fix overflow in update_tg_cfs_runnable()
Summary
In the Linux kernel, the following vulnerability has been resolved:
sched/fair: Fix overflow in update_tg_cfs_runnable()
A divide-by-zero crash is observed when running hackbench:
[14697.488452] CPU: 112 UID: 0 PID: 124791 Comm: hackbench Not tainted 7.1.0-rc2+
[14697.492627] RIP: 0010:propagate_entity_load_avg+0x35f/0x3e0
[14697.506799] <TASK>
[14697.507411] __dequeue_task+0x2b4/0xc70
[14697.508677] dequeue_task_fair+0x36/0x370
[14697.509047] dequeue_task+0x101/0x2f0
[14697.509426] __schedule+0x1b1/0x1a00
[14697.510868] anon_pipe_read+0x3da/0x450
[14697.511400] vfs_read+0x361/0x390
[14697.512053] __x64_sys_read+0x19/0x30
The divide-by-zero happens here:
if (scale_load_down(gcfs_rq->load.weight)) {
load_sum = div_u64(gcfs_rq->avg.load_sum,
scale_load_down(gcfs_rq->load.weight));
}
gcfs_rq->load.weight is an insane large value and is truncated
to the lower 32 bits by div_u64, which happen to be 0.
Using AI for investigation, the cause is a u32 overflow in
update_tg_cfs_runnable(), and flat pickup became a victim when using
tg_tasks():
u32 new_sum, divider;
...
new_sum = se->avg.runnable_avg * divider; <-- boom
The following sequence shows how this triggers the crash:
propagate_entity_load_avg()
update_tg_cfs_runnable() # u32 overflow corrupts runnable_sum
__update_load_avg_cfs_rq()
___update_load_avg() # computes insane runnable_avg
update_tg_load_avg() # propagates to tg->runnable_avg
update_cfs_group()
calc_concur_shares()
tg_tasks() # long-to-int truncation, negative nr
reweight_entity() # corrupted se->load.weight
update_load_add() # corrupted cfs_rq->load.weight
propagate_entity_load_avg()
update_tg_cfs_load()
div_u64() # divide-by-zero
Fix by widening new_sum from u32 to u64 (no need to force tg_tasks()
to return unsigned long after this fix)
Severity
No CVSS data available.
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < 39d707097a0820c6e87eff4195f0940e8ff1147e
(git)
Affected: 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < 69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75 (git) Affected: 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < 7cc237e3bc1733928313d2462b413ae441b0eef3 (git) Affected: 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < 18fdd0978ec3dda0ff6865cd273e47e022180710 (git) Affected: 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < f94e62d21faad5e244d0874598a4d0ebbc0ea405 (git) Affected: 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 , < 4f166adb5cb0525d9e32d45729fd8f28c80acbee (git) |
guessed | |
| Linux | Linux |
Affected:
5.17
Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/sched/fair.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "39d707097a0820c6e87eff4195f0940e8ff1147e",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "7cc237e3bc1733928313d2462b413ae441b0eef3",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "18fdd0978ec3dda0ff6865cd273e47e022180710",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "f94e62d21faad5e244d0874598a4d0ebbc0ea405",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "4f166adb5cb0525d9e32d45729fd8f28c80acbee",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/sched/fair.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"lessThan": "5.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "5.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix overflow in update_tg_cfs_runnable()\n\nA divide-by-zero crash is observed when running hackbench:\n\n [14697.488452] CPU: 112 UID: 0 PID: 124791 Comm: hackbench Not tainted 7.1.0-rc2+\n [14697.492627] RIP: 0010:propagate_entity_load_avg+0x35f/0x3e0\n [14697.506799] \u003cTASK\u003e\n [14697.507411] __dequeue_task+0x2b4/0xc70\n [14697.508677] dequeue_task_fair+0x36/0x370\n [14697.509047] dequeue_task+0x101/0x2f0\n [14697.509426] __schedule+0x1b1/0x1a00\n [14697.510868] anon_pipe_read+0x3da/0x450\n [14697.511400] vfs_read+0x361/0x390\n [14697.512053] __x64_sys_read+0x19/0x30\n\nThe divide-by-zero happens here:\n\n if (scale_load_down(gcfs_rq-\u003eload.weight)) {\n load_sum = div_u64(gcfs_rq-\u003eavg.load_sum,\n scale_load_down(gcfs_rq-\u003eload.weight));\n }\n\ngcfs_rq-\u003eload.weight is an insane large value and is truncated\nto the lower 32 bits by div_u64, which happen to be 0.\n\nUsing AI for investigation, the cause is a u32 overflow in\nupdate_tg_cfs_runnable(), and flat pickup became a victim when using\ntg_tasks():\n\n u32 new_sum, divider;\n ...\n new_sum = se-\u003eavg.runnable_avg * divider; \u003c-- boom\n\nThe following sequence shows how this triggers the crash:\n\n propagate_entity_load_avg()\n update_tg_cfs_runnable() # u32 overflow corrupts runnable_sum\n\n __update_load_avg_cfs_rq()\n ___update_load_avg() # computes insane runnable_avg\n update_tg_load_avg() # propagates to tg-\u003erunnable_avg\n\n update_cfs_group()\n calc_concur_shares()\n tg_tasks() # long-to-int truncation, negative nr\n reweight_entity() # corrupted se-\u003eload.weight\n update_load_add() # corrupted cfs_rq-\u003eload.weight\n\n propagate_entity_load_avg()\n update_tg_cfs_load()\n div_u64() # divide-by-zero\n\nFix by widening new_sum from u32 to u64 (no need to force tg_tasks()\nto return unsigned long after this fix)"
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T09:06:55.184Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/39d707097a0820c6e87eff4195f0940e8ff1147e"
},
{
"url": "https://git.kernel.org/stable/c/69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75"
},
{
"url": "https://git.kernel.org/stable/c/7cc237e3bc1733928313d2462b413ae441b0eef3"
},
{
"url": "https://git.kernel.org/stable/c/18fdd0978ec3dda0ff6865cd273e47e022180710"
},
{
"url": "https://git.kernel.org/stable/c/f94e62d21faad5e244d0874598a4d0ebbc0ea405"
},
{
"url": "https://git.kernel.org/stable/c/4f166adb5cb0525d9e32d45729fd8f28c80acbee"
}
],
"title": "sched/fair: Fix overflow in update_tg_cfs_runnable()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-93182",
"datePublished": "2026-09-17T16:12:09.381Z",
"dateReserved": "2026-09-17T16:02:15.091Z",
"dateUpdated": "2026-10-19T09:06:55.184Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-93182",
"date": "2026-11-09",
"epss": "0.00206",
"percentile": "0.10652"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/sched/fair.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "39d707097a0820c6e87eff4195f0940e8ff1147e",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "7cc237e3bc1733928313d2462b413ae441b0eef3",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "18fdd0978ec3dda0ff6865cd273e47e022180710",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "f94e62d21faad5e244d0874598a4d0ebbc0ea405",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
},
{
"lessThan": "4f166adb5cb0525d9e32d45729fd8f28c80acbee",
"status": "affected",
"version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/sched/fair.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"lessThan": "5.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix overflow in update_tg_cfs_runnable()\n\nA divide-by-zero crash is observed when running hackbench:\n\n [14697.488452] CPU: 112 UID: 0 PID: 124791 Comm: hackbench Not tainted 7.1.0-rc2+\n [14697.492627] RIP: 0010:propagate_entity_load_avg+0x35f/0x3e0\n [14697.506799] \u003cTASK\u003e\n [14697.507411] __dequeue_task+0x2b4/0xc70\n [14697.508677] dequeue_task_fair+0x36/0x370\n [14697.509047] dequeue_task+0x101/0x2f0\n [14697.509426] __schedule+0x1b1/0x1a00\n [14697.510868] anon_pipe_read+0x3da/0x450\n [14697.511400] vfs_read+0x361/0x390\n [14697.512053] __x64_sys_read+0x19/0x30\n\nThe divide-by-zero happens here:\n\n if (scale_load_down(gcfs_rq-\u003eload.weight)) {\n load_sum = div_u64(gcfs_rq-\u003eavg.load_sum,\n scale_load_down(gcfs_rq-\u003eload.weight));\n }\n\ngcfs_rq-\u003eload.weight is an insane large value and is truncated\nto the lower 32 bits by div_u64, which happen to be 0.\n\nUsing AI for investigation, the cause is a u32 overflow in\nupdate_tg_cfs_runnable(), and flat pickup became a victim when using\ntg_tasks():\n\n u32 new_sum, divider;\n ...\n new_sum = se-\u003eavg.runnable_avg * divider; \u003c-- boom\n\nThe following sequence shows how this triggers the crash:\n\n propagate_entity_load_avg()\n update_tg_cfs_runnable() # u32 overflow corrupts runnable_sum\n\n __update_load_avg_cfs_rq()\n ___update_load_avg() # computes insane runnable_avg\n update_tg_load_avg() # propagates to tg-\u003erunnable_avg\n\n update_cfs_group()\n calc_concur_shares()\n tg_tasks() # long-to-int truncation, negative nr\n reweight_entity() # corrupted se-\u003eload.weight\n update_load_add() # corrupted cfs_rq-\u003eload.weight\n\n propagate_entity_load_avg()\n update_tg_cfs_load()\n div_u64() # divide-by-zero\n\nFix by widening new_sum from u32 to u64 (no need to force tg_tasks()\nto return unsigned long after this fix)"
}
],
"id": "CVE-2026-93182",
"lastModified": "2026-10-19T10:17:08.693",
"metrics": {},
"published": "2026-09-17T17:18:14.153",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/18fdd0978ec3dda0ff6865cd273e47e022180710"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/39d707097a0820c6e87eff4195f0940e8ff1147e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4f166adb5cb0525d9e32d45729fd8f28c80acbee"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7cc237e3bc1733928313d2462b413ae441b0eef3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f94e62d21faad5e244d0874598a4d0ebbc0ea405"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T02:04:44+00:00",
"cve": "CVE-2026-93182",
"id": "CVE-2026-93182",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_affected": "161",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sched/fair: Fix overflow in update_tg_cfs_runnable()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93182.json",
"version": "3"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.