5.5

CVE-2022-48809: net: fix a memleak when uncloning an skb dst and its metadata

Modified
AliasesUBUNTU-CVE-2022-48809DEBIAN-CVE-2022-48809
Published 16-07-2024Last modified 11-05-2026

Vulnerability summary

CVE-2022-48809 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 21% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.28%
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 5 · Related 5
SUSE-SU-2024:2894-1SUSE-SU-2024:2939-1SUSE-SU-2024:2947-1SUSE-SU-2024:4100-1SUSE-SU-2025:0034-1

Timeline

  1. 16-07-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% 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
  • linuxAll versions (No fix recorded) | < 4.15.0-177.186 | < 5.4.0-110.124
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1128.137 | < 5.4.0-1073.78
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ fc4099f17240767554ff3a73977acb78ef615404, < 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < c1ff27d100e2670b03cbfddb9117e5f9fc672540 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < 0be943916d781df2b652793bb2d3ae4f9624c10a | ≥ fc4099f17240767554ff3a73977acb78ef615404, < a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < fdcb263fa5cda15b8cb24a641fa2718c47605314 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < 8b1087b998e273f07be13dcb5f3ca4c309c7f108 | ≥ fc4099f17240767554ff3a73977acb78ef615404, < 9eeabdf17fa0ab75381045c867c370f4cc75a613 | 4.3
  • linux_kernel≥ 4.3, < 4.9.302 | ≥ 4.10, < 4.14.267 | ≥ 4.15, < 4.19.230 | ≥ 4.20, < 5.4.180 | ≥ 5.5, < 5.10.101 | ≥ 5.11, < 5.15.24 | ≥ 5.16, < 5.16.10
Debian1 product
  • linux< 5.16.10-1

3 vendors · 96 products

References

12 links
Show all 12 references