{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93182", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.091Z", "datePublished": "2026-09-17T16:12:09.381Z", "dateUpdated": "2026-10-19T09:06:55.184Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:06:55.184Z" }, "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] \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->load.weight)) {\n load_sum = div_u64(gcfs_rq->avg.load_sum,\n scale_load_down(gcfs_rq->load.weight));\n }\n\ngcfs_rq->load.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->avg.runnable_avg * divider; <-- 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->runnable_avg\n\n update_cfs_group()\n calc_concur_shares()\n tg_tasks() # long-to-int truncation, negative nr\n reweight_entity() # corrupted se->load.weight\n update_load_add() # corrupted cfs_rq->load.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)" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/fair.c" ], "versions": [ { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "39d707097a0820c6e87eff4195f0940e8ff1147e", "status": "affected", "versionType": "git" }, { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75", "status": "affected", "versionType": "git" }, { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "7cc237e3bc1733928313d2462b413ae441b0eef3", "status": "affected", "versionType": "git" }, { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "18fdd0978ec3dda0ff6865cd273e47e022180710", "status": "affected", "versionType": "git" }, { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "f94e62d21faad5e244d0874598a4d0ebbc0ea405", "status": "affected", "versionType": "git" }, { "version": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8", "lessThan": "4f166adb5cb0525d9e32d45729fd8f28c80acbee", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/fair.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }