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CVE-2022-49191· NVD / CVE Program· CNA Linux

mxser: fix xmit_buf leak in activate when LSR == 0xff

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 125b7c929fc9b1e5eaa344bceb6367dfa6fd3f9d, 2cd05c38a27bee7fb42aa4d43174d68ac55dac0f, 376922045009f8ea2d20a8fa3475e95b47c41690.

Low priority for now. Upgrade to Linux Linux 125b7c929fc9b1e5eaa344bceb6367dfa6fd3f9d, 2cd05c38a27bee7fb42aa4d43174d68ac55dac0f, 376922045009f8ea2d20a8fa3475e95b47c41690 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: mxser: fix xmit_buf leak in activate when LSR == 0xff When LSR is 0xff in ->activate() (rather unlike), we return an error. Provided ->shutdown() is not called when ->activate() fails, nothing actually frees the buffer in this case. Fix this by properly freeing the buffer in a designated label. We jump there also from the "!info->type" if now too.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 18th 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 kernel2.6.33 and later · before 4.9.311
  • linux linux kernel4.10 and later · before 4.14.276
  • linux linux kernel4.15 and later · before 4.19.238
  • linux linux kernel4.20 and later · before 5.4.189
  • linux linux kernel5.5 and later · before 5.10.110
  • linux linux kernel5.11 and later · before 5.15.33
  • linux linux kernel5.16 and later · before 5.16.19
  • linux linux kernel5.17 and later · before 5.17.2

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

    • 2.6.33affected
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 376922045009f8ea2d20a8fa3475e95b47c41690affected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 125b7c929fc9b1e5eaa344bceb6367dfa6fd3f9daffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 685b6d16bf89595310b5d61394c9b97cc9505c7caffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 996291d06851a26678a0fab488b6e1f0677c0576affected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 2cd05c38a27bee7fb42aa4d43174d68ac55dac0faffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before b125b08dbee3611f03f53b71471813ed4ccafcddaffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 6c9041b2f90c0eace73106f22350e1d2c98f5edcaffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before 6dffc2035fbaada60ca8db59e0962e34f760370aaffected · git
    • 6769140d304731f0a3b177470a2adb4bacd9036b and later · before cd3a4907ee334b40d7aa880c7ab310b154fd5cd4affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1

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-2022-49189Feb 26, 2025 · clk: qcom: clk-rcg2: Update logic to calculate D value for RCG
    22Monitor
  • ← EarlierCVE-2022-49190Feb 26, 2025 · kernel/resource: fix kfree() of bootmem memory again
    22Monitor
  • Later →CVE-2022-49192Feb 26, 2025 · drivers: ethernet: cpsw: fix panic when interrupt coaleceing is set via ethtool
    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 Linux125b7c929fc9b1e5eaa344bceb6367dfa6fd3f9dVendor (CNA)
Linux Linux2cd05c38a27bee7fb42aa4d43174d68ac55dac0fVendor (CNA)
Linux Linux376922045009f8ea2d20a8fa3475e95b47c41690Vendor (CNA)
Linux Linux685b6d16bf89595310b5d61394c9b97cc9505c7cVendor (CNA)
Linux Linux6c9041b2f90c0eace73106f22350e1d2c98f5edcVendor (CNA)
Linux Linux6dffc2035fbaada60ca8db59e0962e34f760370aVendor (CNA)
Linux Linux996291d06851a26678a0fab488b6e1f0677c0576Vendor (CNA)
Linux Linuxb125b08dbee3611f03f53b71471813ed4ccafcddVendor (CNA)
Linux Linuxcd3a4907ee334b40d7aa880c7ab310b154fd5cd4Vendor (CNA)
debian:linux5.17.3-1 · 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 (8 more)

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

All records