7.8

CVE-2026-22999: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-22999DEBIAN-CVE-2026-22999
Published 25-01-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-22999 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 13.9% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 148 · Related 144
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1OPENSUSE-SU-2026:20287-1SUSE-SU-2026:0447-1

Showing 100 of 148. Use Open JSON for the complete list.

Timeline

  1. 25-01-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: do not free existing class in qfq_change_class() Fixes qfq_change_class() error case. cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.03 pp

From 0.21% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-176.186 | < 6.8.0-117.117
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1105.112 | < 6.8.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < cff6cd703f41d8071995956142729e4bba160363 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < f06f7635499bc806cbe2bbc8805c7cef8b1edddf | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 0a234660dc70ce45d771cbc76b20d925b73ec160 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 362e269bb03f7076ba9990e518aeddb898232e50 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < e9d8f11652fa08c647bf7bba7dd8163241a332cd | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 | 3.8
  • linux_kernel≥ 3.8, < 5.10.249 | ≥ 5.11, < 5.15.199 | ≥ 5.16, < 6.1.162 | ≥ 6.2, < 6.6.122 | ≥ 6.7, < 6.12.67 | ≥ 6.13, < 6.18.7 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 159 products

References

40 links
Show all 40 references