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NVD / CVE Program· CNA Linux

CVE-2026-53265: dm cache policy smq: check allocation under invalidate lock

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.09% (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 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a, 13da856c86fb8c2ccab95034fd77da1bb2c2a17c, 42ff6774ecd9d7f70d599cb71ff64373a1da4948; 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 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a, 13da856c86fb8c2ccab95034fd77da1bb2c2a17c, 42ff6774ecd9d7f70d599cb71ff64373a1da4948; 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: dm cache policy smq: check allocation under invalidate lock commit 2d1f7b65f5de ("dm cache policy smq: fix missing locks in invalidating cache blocks") added mq->lock around the destructive part of smq_invalidate_mapping(), but left the e->allocated check outside the critical section. That leaves a check-then-act race. Two concurrent invalidators can both observe e->allocated as true before either of them takes mq->lock. The first invalidator that acquires the lock removes the entry from the queues and hash table and then calls free_entry(), which clears e->allocated and puts the entry back on the free list. The second invalidator can then acquire mq->lock and continue with the stale result of the unlocked check. This can corrupt the SMQ queues or hash table by deleting an entry that is no longer on those structures. It can also hit the allocation check in free_entry() when the same entry is freed again. Move the allocation check under mq->lock so the predicate and the destructive operations are serialized by the same lock.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 19, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

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-2026-53265

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 kernel6.6.141 and later · before 6.6.143
  • linux linux kernel6.12.91 and later · before 6.12.94
  • linux linux kernel6.18.33 and later · before 6.18.36
  • linux linux kernel7.0.10 and later · before 7.0.13
  • linux linux kernel5.10.258
  • linux linux kernel5.15.209
  • linux linux kernel6.1.175
  • linux linux kernel7.1

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

    • 4991b5a08751e2e82488fb93ae08849b6aea10d9 and later · before c242c7af2aecf0b538b8623bdb86b8b441da38d9affected · git
    • 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 and later · before 13da856c86fb8c2ccab95034fd77da1bb2c2a17caffected · git
    • 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e and later · before d886945fcb0f8c9dc6b39928d7a96c95c587346caffected · git
    • ac5ee99443891bdb161f5539606a66a1b5e72542 and later · before b4892561552d671bd8c4da5ebb70e9fbb1ec446eaffected · git
    • 93627a29d4b66d4a2def938dfb8610cc80ae454b and later · before 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59aaffected · git
    • c348ae47d8e65f06429fa41adce9ad986b696766 and later · before 42ff6774ecd9d7f70d599cb71ff64373a1da4948affected · git
    • 2b62d0611c9af14a16bddf22df2612b4f40eb5a1 and later · before c57570fba24016ec25ec046ab44db39143fb7a64affected · git
    • 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 and later · before d3f0a606b9f278ece8a0df626ded9c4044071235affected · git
    • 5.10.258 and later · before 5.10.259affected · semver
    • 5.15.209 and later · before 5.15.210affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
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-2026-53263Jun 25, 2026 · 6lowpan: fix off-by-one in multicast context address compression
    22Monitor
  • ← EarlierCVE-2026-53264Jun 25, 2026 · net/sched: act_api: use RCU with deferred freeing for action lifecycle
    31Monitor
  • Later →CVE-2026-53267Jun 25, 2026 · netfilter: nft_ct: bail out on template ct in get eval
    31Monitor

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 Linux03ffe1112ed88bb3a9bd0b971549bf4d64bfc59aVendor (CNA)
Linux Linux13da856c86fb8c2ccab95034fd77da1bb2c2a17cVendor (CNA)
Linux Linux42ff6774ecd9d7f70d599cb71ff64373a1da4948Vendor (CNA)
Linux Linux5.10.259Vendor (CNA)
Linux Linux5.15.210Vendor (CNA)
Linux Linux6.1.176Vendor (CNA)
Linux Linux6.12.94Vendor (CNA)
Linux Linux6.18.36Vendor (CNA)
Linux Linux6.6.143Vendor (CNA)
Linux Linux7.0.13Vendor (CNA)
Linux Linuxb4892561552d671bd8c4da5ebb70e9fbb1ec446eVendor (CNA)
Linux Linuxc242c7af2aecf0b538b8623bdb86b8b441da38d9Vendor (CNA)
Linux Linuxc57570fba24016ec25ec046ab44db39143fb7a64Vendor (CNA)
Linux Linuxd3f0a606b9f278ece8a0df626ded9c4044071235Vendor (CNA)
Linux Linuxd886945fcb0f8c9dc6b39928d7a96c95c587346cVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux7.0.13-1 · Debian:14Package 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. 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