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NVD / CVE Program· CNA Linux

CVE-2026-53245: net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.12% (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 36d259711872e3b2f6cd76a4d270c21931c0f35f, 42446ca0f3570663e87183c065e0b4def52dfba2, 6d6e42e8e17f18d61327f8653479c5b5e161ae1d; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 36d259711872e3b2f6cd76a4d270c21931c0f35f, 42446ca0f3570663e87183c065e0b4def52dfba2, 6d6e42e8e17f18d61327f8653479c5b5e161ae1d; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr In mrp_pdu_parse_vecattr(), vector attribute events are encoded three per byte and valen tracks the number of events left to process. The parser decrements valen after processing the first and second events from each event byte, but not after processing the third one. When valen is exactly a multiple of three, the loop continues after the last valid event and consumes the next byte as a new event byte, applying a spurious event to the MRP applicant state. Additionally, when valen is zero the parser unconditionally consumes attrlen bytes as FirstValue and advances the offset, even though per IEEE 802.1ak a VectorAttribute with only a LeaveAllEvent has valen of zero and no FirstValue or Vector fields. This corrupts the offset for subsequent PDU parsing. Also, when valen exceeds three the loop crosses byte boundaries but the attribute value is not incremented between the last event of one byte and the first event of the next. This causes the first event of the next byte to use the same attribute value as the third event rather than the next consecutive value. Decrement valen after processing the third event, skip FirstValue consumption when valen is zero, and increment the attribute value at the end of each loop iteration.

Published
Jun 25, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th 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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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.

Follow CVE-2026-53245

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  • when exploit code appears or is weaponized
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  • 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

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

    • 3.9affected
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before ae65714d96f68bb252eb20085320bdaacab36c00affected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before 36d259711872e3b2f6cd76a4d270c21931c0f35faffected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before cc98717e591a963a616fdf15ecf48eefaf45d758affected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before 6d6e42e8e17f18d61327f8653479c5b5e161ae1daffected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before fd9c3a47c670bec6b18f44454cea023f93b5adb3affected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before 42446ca0f3570663e87183c065e0b4def52dfba2affected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before 6eea6494e542a03cdf755a593b7d74f3f7c260fdaffected · git
    • febf018d22347b5df94066bca05d0c11a84e839d and later · before 7561c7fbc694308da73300f036719e63e42bf0b4affected · git
    • before 3.9not affected · semver
Affected versions · NVD (8)

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

  • linux linux kernel3.9 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel7.1

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.13-17.0.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2026-53241Jun 25, 2026 · ALSA: seq: dummy: fix UMP event stack overread
    22Monitor
  • ← EarlierCVE-2026-53242Jun 25, 2026 · ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams
    31Monitor
  • Later →CVE-2026-53246Jun 25, 2026 · sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
    39Monitor

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 Linux36d259711872e3b2f6cd76a4d270c21931c0f35fVendor (CNA)
Linux Linux42446ca0f3570663e87183c065e0b4def52dfba2Vendor (CNA)
Linux Linux6d6e42e8e17f18d61327f8653479c5b5e161ae1dVendor (CNA)
Linux Linux6eea6494e542a03cdf755a593b7d74f3f7c260fdVendor (CNA)
Linux Linux7561c7fbc694308da73300f036719e63e42bf0b4Vendor (CNA)
Linux Linuxae65714d96f68bb252eb20085320bdaacab36c00Vendor (CNA)
Linux Linuxcc98717e591a963a616fdf15ecf48eefaf45d758Vendor (CNA)
Linux Linuxfd9c3a47c670bec6b18f44454cea023f93b5adb3Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · 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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (8 more)

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

All records