7.8

CVE-2023-31436: linux linux_kernel Out-of-bounds Write

Modified
AliasesSUSE-SU-2023:2700-1SUSE-SU-2023:2709-1SUSE-SU-2023:2720-1
Published 28-04-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-31436 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux linux_kernel. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 48.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.60%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 82 · Duplicates 2 · Related 57
DLA-3446-1DSA-5402-1LSN-0095-1LSN-0096-1LSN-0099-1MGASA-2023-0166

Timeline

  1. 28-04-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.59% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu93 products
  • linux< 3.13.0-194.245 | < 4.4.0-241.275 | < 4.15.0-212.223 | < 5.4.0-150.167 | < 5.15.0-73.80
  • linux-allwinner-5.19< 5.19.0-1013.13~22.04.1
  • linux-aws< 4.4.0-1119.125 | < 4.4.0-1157.172 | < 4.15.0-1157.170 | < 5.4.0-1103.111 | < 5.15.0-1037.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Suse6 products
  • kernel-livepatch-SLE15-SP2_Update_35&distro=SUSE Linux Enterprise Live Patching 15 SP2< 3-150200.2.1
  • kernel-livepatch-SLE15-SP2_Update_36&distro=SUSE Linux Enterprise Live Patching 15 SP2< 3-150200.2.1
  • kernel-livepatch-SLE15-SP3_Update_31&distro=SUSE Linux Enterprise Live Patching 15 SP3< 3-150300.2.1
  • kernel-livepatch-SLE15-SP3_Update_32&distro=SUSE Linux Enterprise Live Patching 15 SP3< 3-150300.2.1
  • kernel-livepatch-SLE15-SP4_Update_11&distro=SUSE Linux Enterprise Live Patching 15 SP4< 3-150400.2.2
Debian1 product
  • linux< 6.1.27-1
Linux1 product
  • linux_kernel≥ 3.7, < 4.14.314 | ≥ 4.15, < 4.19.282 | ≥ 4.20, < 5.4.242 | ≥ 5.5.0, < 5.10.179 | ≥ 5.11, < 5.15.109 | ≥ 5.16, < 6.1.26 | ≥ 6.2, < 6.2.13

4 vendors · 101 products

References

37 links
Show all 37 references