CVE-2026-93182 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507403
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-93182 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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)
References
- https://security-tracker.debian.org/tracker/CVE-2026-93182
- https://git.kernel.org/stable/c/18fdd0978ec3dda0ff6865cd273e47e022180710
- https://git.kernel.org/stable/c/39d707097a0820c6e87eff4195f0940e8ff1147e
- https://git.kernel.org/stable/c/4f166adb5cb0525d9e32d45729fd8f28c80acbee
- https://git.kernel.org/stable/c/69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75
- https://git.kernel.org/stable/c/7cc237e3bc1733928313d2462b413ae441b0eef3
- https://git.kernel.org/stable/c/f94e62d21faad5e244d0874598a4d0ebbc0ea405