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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-31423 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/17c1b9807b8a67d676b6dcf749ee932ebaa7f568 kernel.org Patch 
https://git.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9 kernel.org Patch 
https://git.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322 kernel.org Patch 
https://git.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f kernel.org Patch 
https://git.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163 kernel.org Patch 
https://git.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835 kernel.org Patch 
https://git.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bd kernel.org Patch 
https://git.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5 kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-369 Divide By Zero cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-31423
NVD Published Date:
04/13/2026
NVD Last Modified:
05/20/2026
Source:
kernel.org