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CVE-2022-49809· NVD / CVE Program· CNA Linux

net/x25: Fix skb leak in x25_lapb_receive_frame()

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: 0.20% (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 0ef17d966445358a55c5f4ccf2c73cca3e39192b, 2929cceb2fcf0ded7182562e4888afafece82cce, 2d675be16a461310d738d93f9f1a00da62055c5a.

Low priority for now. Upgrade to Linux Linux 0ef17d966445358a55c5f4ccf2c73cca3e39192b, 2929cceb2fcf0ded7182562e4888afafece82cce, 2d675be16a461310d738d93f9f1a00da62055c5a 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

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix skb leak in x25_lapb_receive_frame() x25_lapb_receive_frame() using skb_copy() to get a private copy of skb, the new skb should be freed in the undersized/fragmented skb error handling path. Otherwise there is a memory leak.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 9th percentile

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 kernel3.0.72 and later · before 3.1
  • linux linux kernel3.1.1 and later · before 4.9.334
  • linux linux kernel4.10 and later · before 4.14.300
  • linux linux kernel4.15 and later · before 4.19.267
  • linux linux kernel4.20 and later · before 5.4.225
  • linux linux kernel5.5 and later · before 5.10.156
  • linux linux kernel5.11 and later · before 5.15.80
  • linux linux kernel5.16 and later · before 6.0.10
  • linux linux kernel3.1
  • linux linux kernel6.1

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

    • 7f3ea0c12493c9ff38a13a89bcf08846b50c1f1c, 3.1affected
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before fda0ba7c84b46d10947c687320804b9de149a921affected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before dfcfbe4f2e4b2c81cff4e79b48502d97fda73118affected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before 0ef17d966445358a55c5f4ccf2c73cca3e39192baffected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before e109b41870db995cae25dfaf0cc3922f9028b1a1affected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before 9f00da9c866d506998bf0a3f699ec900730472daaffected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before c8baf1fc248b2e88642f094fea9509a9bf98c5bbaffected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before 2d675be16a461310d738d93f9f1a00da62055c5aaffected · git
    • cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df and later · before 2929cceb2fcf0ded7182562e4888afafece82cceaffected · git
    • 3.0.72 and later · before 3.1affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.10-16.0.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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  • 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
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
    77This week
  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

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 Linux0ef17d966445358a55c5f4ccf2c73cca3e39192bVendor (CNA)
Linux Linux2929cceb2fcf0ded7182562e4888afafece82cceVendor (CNA)
Linux Linux2d675be16a461310d738d93f9f1a00da62055c5aVendor (CNA)
Linux Linux3.1Vendor (CNA)
Linux Linux9f00da9c866d506998bf0a3f699ec900730472daVendor (CNA)
Linux Linuxc8baf1fc248b2e88642f094fea9509a9bf98c5bbVendor (CNA)
Linux Linuxdfcfbe4f2e4b2c81cff4e79b48502d97fda73118Vendor (CNA)
Linux Linuxe109b41870db995cae25dfaf0cc3922f9028b1a1Vendor (CNA)
Linux Linuxfda0ba7c84b46d10947c687320804b9de149a921Vendor (CNA)
debian:linux6.0.10-1 · 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)

CWE-401 · Missing Release of Memory after Effective Lifetime

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