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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1084716f76c8045eadf92a9d9a62641f3c8d8c90, 317260b3eb6384a05a8af212308fa50f3b2e8290, 3e6de5037148c5a93a436b1e8d2edad3dac11755.

Low priority for now. Upgrade to Linux Linux 1084716f76c8045eadf92a9d9a62641f3c8d8c90, 317260b3eb6384a05a8af212308fa50f3b2e8290, 3e6de5037148c5a93a436b1e8d2edad3dac11755 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 19th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.10 and later · before 4.14.283
  • linux linux kernel4.15 and later · before 4.19.247
  • linux linux kernel4.20 and later · before 5.4.198
  • linux linux kernel5.5 and later · before 5.10.122
  • linux linux kernel5.11 and later · before 5.15.47
  • linux linux kernel5.16 and later · before 5.17.15
  • linux linux kernel5.18 and later · before 5.18.4
  • linux linux kernel5.19

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.10affected
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 64aef8efe96c1616142c4476a05731306fc4494eaffected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before ab8b2c2de273ec1d698a18e399896a6febb5cda0affected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 317260b3eb6384a05a8af212308fa50f3b2e8290affected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 5d9c1b081ad28c852a97e10dd75412546497694aaffected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 1084716f76c8045eadf92a9d9a62641f3c8d8c90affected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 3e6de5037148c5a93a436b1e8d2edad3dac11755affected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 9ba4416b831eeb4d185e88e73488d1d21288e63aaffected · git
    • bf355b8d2c30a289232042cacc1cfaea4923936c and later · before 5801f064e35181c71857a80ff18af4dbec3c5f5caffected · git
    • before 4.10not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.5-15.18.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49337Feb 26, 2025 · ocfs2: dlmfs: fix error handling of user_dlm_destroy_lock
    22Monitor
  • ← EarlierCVE-2022-49338Feb 26, 2025 · net/mlx5e: CT: Fix cleanup of CT before cleanup of TC ct rules
    22Monitor
  • Later →CVE-2022-49340Feb 26, 2025 · ip_gre: test csum_start instead of transport header
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1084716f76c8045eadf92a9d9a62641f3c8d8c90Vendor (CNA)
Linux Linux317260b3eb6384a05a8af212308fa50f3b2e8290Vendor (CNA)
Linux Linux3e6de5037148c5a93a436b1e8d2edad3dac11755Vendor (CNA)
Linux Linux5801f064e35181c71857a80ff18af4dbec3c5f5cVendor (CNA)
Linux Linux5d9c1b081ad28c852a97e10dd75412546497694aVendor (CNA)
Linux Linux64aef8efe96c1616142c4476a05731306fc4494eVendor (CNA)
Linux Linux9ba4416b831eeb4d185e88e73488d1d21288e63aVendor (CNA)
Linux Linuxab8b2c2de273ec1d698a18e399896a6febb5cda0Vendor (CNA)
debian:linux5.18.5-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records