CVE-2026-93182sched/fair: Fix overflow in update_tg_cfs_runnable()

Description

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)

Timeline

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)

0.21% · top 89% of all CVEs (12 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

• Linux · Linux

  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < 39d707097a0820c6e87eff4195f0940e8ff1147e
  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < 69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75
  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < 7cc237e3bc1733928313d2462b413ae441b0eef3
  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < 18fdd0978ec3dda0ff6865cd273e47e022180710
  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < f94e62d21faad5e244d0874598a4d0ebbc0ea405
  • affected 95246d1ec80b8d19d882cd8eb7ad094e63b41bb8 – < 4f166adb5cb0525d9e32d45729fd8f28c80acbee

• Linux · Linux

  • affected 5.17
  • unaffected < 5.17
  • unaffected 6.1.188 – ≤ 6.1.*
  • unaffected 6.6.157 – ≤ 6.6.*
  • unaffected 6.12.110 – ≤ 6.12.*
  • unaffected 6.18.52 – ≤ 6.18.*
  • unaffected 7.2.6 – ≤ 7.2.*
  • unaffected 7.3 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-82290 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-93182](https://cveledger.app/badge/CVE-2026-93182.svg)](https://cveledger.app/cve/CVE-2026-93182)

Record last updated 19 Oct 2026, 09:06 UTC.