CVE-2026-23379

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

net/sched: ets: fix divide by zero in the offload path

Offloading ETS requires computing each class' WRR weight: this is done by

averaging over the sums of quanta as 'q_sum' and 'q_psum'. Using unsigned

int, the same integer size as the individual DRR quanta, can overflow and

even cause division by zero, like it happened in the following splat:

Oops: divide error: 0000 [#1] SMP PTI

CPU: 13 UID: 0 PID: 487 Comm: tc Tainted: G E 6.19.0-virtme #45 PREEMPT(full)

Tainted: [E]=UNSIGNED_MODULE

Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011

RIP: 0010:ets_offload_change+0x11f/0x290 [sch_ets]

Code: e4 45 31 ff eb 03 41 89 c7 41 89 cb 89 ce 83 f9 0f 0f 87 b7 00 00 00 45 8b 08 31 c0 45 01 cc 45 85 c9 74 09 41 6b c4 64 31 d2 <41> f7 f2 89 c2 44 29 fa 45 89 df 41 83 fb 0f 0f 87 c7 00 00 00 44

RSP: 0018:ffffd0a180d77588 EFLAGS: 00010246

RAX: 00000000ffffff38 RBX: ffff8d3d482ca000 RCX: 0000000000000000

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References