CVE-2026-31423

MEDIUM EPSS 1.8%
Published Apr 13, 20262mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 13, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_hfsc: fix divide-by-zero in rtsc_min() m2sm() converts a u32 slope to a u64 scaled value. For large inputs (e.g. m1=4000000000), the result can reach 2^32. rtsc_min() stores the difference of two such u64 values in a u32 variable `dsm` and uses it as a divisor. When the difference is exactly 2^32 the truncation yields zero, causing a divide-by-zero oops in the concave-curve intersection path: Oops: divide error: 0000 RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601) Call Trace: init_ed (net/sched/sch_hfsc.c:629) hfsc_enqueue (net/sched/sch_hfsc.c:1569) [...] Widen `dsm` to u64 and replace do_div() with div64_u64() so the full difference is preserved.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-369

Affected Products 18

VendorProductVersionRange
linuxlinux_kernel*≥2.6.12.1  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.134
linuxlinux_kernel*≥6.7  –  <6.12.81
linuxlinux_kernel*≥6.13  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/17c1b9807b8a67d676b6dcf749ee932ebaa7f568
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/17c1b9807b8a67d676b6dcf749ee932ebaa7f568
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5
    Patch