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NVD / CVE Program· CNA Linux

CVE-2025-37757: tipc: fix memory leak in tipc_link_xmit

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: 0.45% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 09c2dcda2c551bba30710c33f6ac678ae7395389, 24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb, 69ae94725f4fc9e75219d2d69022029c5b24bc9a; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 09c2dcda2c551bba30710c33f6ac678ae7395389, 24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb, 69ae94725f4fc9e75219d2d69022029c5b24bc9a; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 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: tipc: fix memory leak in tipc_link_xmit In case the backlog transmit queue for system-importance messages is overloaded, tipc_link_xmit() returns -ENOBUFS but the skb list is not purged. This leads to memory leak and failure when a skb is allocated. This commit fixes this issue by purging the skb list before tipc_link_xmit() returns.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Oct 15, 2026
EPSS
0.4% · 39th 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 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.5
2.0 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2025-37757

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
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.237
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernel6.2 and later · before 6.6.88
  • linux linux kernel4.11 and later · before 5.4.293
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.7 and later · before 6.12.24
  • linux linux kernel6.15

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

    • 4.11affected
    • 365ad353c2564bba8835290061308ba825166b3a and later · before 84895f5ce3829d9fc030e5ec2d8729da4c0c9d08affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before d4d40e437adb376be16b3a12dd5c63f0fa768247affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before ed06675d3b8cd37120b447646d53f7cd3e6fcd63affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before 24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bbaffected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before 09c2dcda2c551bba30710c33f6ac678ae7395389affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before 7c5957f7905b4aede9d7a559d271438f3ca9e852affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before d0e02d3d27a0b4dcb13f954f537ca1dd8f282dcfaffected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before a40cbfbb8f95c325430f017883da669b2aa927d4affected · git
    • 365ad353c2564bba8835290061308ba825166b3a and later · before 69ae94725f4fc9e75219d2d69022029c5b24bc9aaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1
SUSE:Linux Micro 6.1kernel-defaultbefore 6.4.0-31.16.4.0-31.1
SUSE:Linux Micro 6.1kernel-default-basebefore 6.4.0-31.1.21.96.4.0-31.1.21.9
SUSE:Linux Micro 6.1kernel-kvmsmallbefore 6.4.0-31.16.4.0-31.1
SUSE:Linux Micro 6.1kernel-rtbefore 6.4.0-34.16.4.0-34.1
SUSE:Linux Micro 6.1kernel-sourcebefore 6.4.0-31.16.4.0-31.1
SUSE:Linux Micro 6.1kernel-source-rtbefore 6.4.0-34.16.4.0-34.1

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-2025-37750May 1, 2025 · smb: client: fix UAF in decryption with multichannel
    31Monitor
  • ← EarlierCVE-2025-37756May 1, 2025 · net: tls: explicitly disallow disconnect
    22Monitor
  • Later →CVE-2025-37759May 1, 2025 · ublk: fix handling recovery & reissue in ublk_abort_queue()
    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 Linux09c2dcda2c551bba30710c33f6ac678ae7395389Vendor (CNA)
Linux Linux24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bbVendor (CNA)
Linux Linux69ae94725f4fc9e75219d2d69022029c5b24bc9aVendor (CNA)
Linux Linux7c5957f7905b4aede9d7a559d271438f3ca9e852Vendor (CNA)
Linux Linux84895f5ce3829d9fc030e5ec2d8729da4c0c9d08Vendor (CNA)
Linux Linuxa40cbfbb8f95c325430f017883da669b2aa927d4Vendor (CNA)
Linux Linuxd0e02d3d27a0b4dcb13f954f537ca1dd8f282dcfVendor (CNA)
Linux Linuxd4d40e437adb376be16b3a12dd5c63f0fa768247Vendor (CNA)
Linux Linuxed06675d3b8cd37120b447646d53f7cd3e6fcd63Vendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · Debian:12Package registry (OSV)
suse:kernel-default6.4.0-31.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-default-base6.4.0-31.1.21.9 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-kvmsmall6.4.0-31.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-rt6.4.0-34.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-source6.4.0-31.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-source-rt6.4.0-34.1 · SUSE:Linux Micro 6.1Package 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.

No history yet (it accumulates with the daily EPSS job).

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (10 more)

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

All records