7.8

CVE-2022-49921: net: sched: Fix use after free in red_enqueue()

Modified
AliasesUBUNTU-CVE-2022-49921DEBIAN-CVE-2022-49921
Published 01-05-2025Last modified 05-08-2026

Vulnerability summary

CVE-2022-49921 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 9% 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
0.19%
0%100%
Low · 0.00 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 3 · Related 3
SUSE-SU-2025:01966-1SUSE-SU-2025:02173-1SUSE-SU-2025:02334-1

Timeline

  1. 01-05-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: Fix use after free in red_enqueue() We can't use "skb" again after passing it to qdisc_enqueue(). This is basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb len before calling child enqueue").

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% 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.

Ubuntu112 products
  • linux< 4.4.0-240.274 | < 4.15.0-206.217 | < 5.4.0-139.156 | < 5.15.0-60.66
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1118.124 | < 4.4.0-1156.171 | < 4.15.0-1151.164 | < 5.4.0-1096.104 | < 5.15.0-1030.34
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < 795afe0b9bb6c915f0299a8e309936519be01619 | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < a238cdcf2bdc72207c74375fc8be13ee549ca9db | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < e877f8fa49fbccc63cb2df2e9179bddc695b825a | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < 52e0429471976785c155bfbf51d80990c6cd46e2 | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < 5960b9081baca85cc7dcb14aec1de85999ea9d36 | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < fc4b50adb400ee5ec527a04073174e8e73a139fa | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < 170e5317042c302777ed6d59fdb84af9b0219d4e | ≥ d7f4f332f082c4d4ba53582f902ed6b44fd6f45e, < 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9 | ab0b3b9dbf559a5633d460e748144697bd2d3aa3 | ≥ 4.4.163, < 4.5 | 4.7
  • linux_kernel≥ 4.4.163, < 4.5 | ≥ 4.7, < 4.9.333 | ≥ 4.10, < 4.14.299 | ≥ 4.15, < 4.19.265 | ≥ 4.20, < 5.4.224 | ≥ 5.5, < 5.10.154 | ≥ 5.11, < 5.15.78 | ≥ 5.16, < 6.0.8 | 6.1:rc1 | 6.1:rc2 | 6.1:rc3
Debian1 product
  • linux< 6.0.8-1

3 vendors · 115 products

References

12 links
Show all 12 references