5.5

CVE-2022-49339: net: ipv6: unexport __init-annotated seg6_hmac_init()

Analyzed
AliasesUBUNTU-CVE-2022-49339DEBIAN-CVE-2022-49339
Published 26-02-2025Last modified 11-05-2026

Vulnerability summary

CVE-2022-49339 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.1% 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 6 · Related 4
RHSA-2023:2951RHSA-2023:6583SUSE-SU-2025:1027-1SUSE-SU-2025:1176-1SUSE-SU-2025:1183-1SUSE-SU-2025:1241-1

Timeline

  1. 26-02-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: unexport __init-annotated seg6_hmac_init() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the caller (net/ipv6/seg6.c) and the callee (net/ipv6/seg6_hmac.c) belong to the same module. It seems an internal function call in ipv6.ko.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

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

No weakness data has been published for this record.

Affected systems

Version check

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

Ubuntu110 products
  • linux< 4.15.0-192.203 | < 5.4.0-126.142 | < 5.15.0-48.54
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1140.151 | < 5.4.0-1085.92 | < 5.15.0-1020.24
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 64aef8efe96c1616142c4476a05731306fc4494e | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < ab8b2c2de273ec1d698a18e399896a6febb5cda0 | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 317260b3eb6384a05a8af212308fa50f3b2e8290 | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 5d9c1b081ad28c852a97e10dd75412546497694a | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 1084716f76c8045eadf92a9d9a62641f3c8d8c90 | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 3e6de5037148c5a93a436b1e8d2edad3dac11755 | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 9ba4416b831eeb4d185e88e73488d1d21288e63a | ≥ bf355b8d2c30a289232042cacc1cfaea4923936c, < 5801f064e35181c71857a80ff18af4dbec3c5f5c | 4.10
  • linux_kernel≥ 4.10, < 4.14.283 | ≥ 4.15, < 4.19.247 | ≥ 4.20, < 5.4.198 | ≥ 5.5, < 5.10.122 | ≥ 5.11, < 5.15.47 | ≥ 5.16, < 5.17.15 | ≥ 5.18, < 5.18.4 | 5.19:rc1
Debian1 product
  • linux< 5.18.5-1

3 vendors · 113 products

References

12 links
Show all 12 references