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CVE-2026-53296· NVD / CVE Program· CNA Linux

mailbox: mailbox-test: free channels on probe error

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: 0.17% (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 02beb178e2e159daeb8f992d7abb16a37da31664, 0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6b, 15c4cc3850cfe1b973eb7b63c02314b267f06a64.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 02beb178e2e159daeb8f992d7abb16a37da31664, 0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6b, 15c4cc3850cfe1b973eb7b63c02314b267f06a64 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: mailbox: mailbox-test: free channels on probe error On probe error, free the previously obtained channels. This not only prevents a leak, but also UAF scenarios because the client structure will be removed nonetheless because it was allocated with devm.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jun 26, 2026
Updated
Jul 7, 2026
EPSS
0.1% · 6th 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 · 0.1%

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-2026-53296

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 kernel4.4 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.141
  • linux linux kernel6.7 and later · before 6.12.91
  • linux linux kernel6.13 and later · before 6.18.33
  • linux linux kernel6.19 and later · before 7.0.10
  • 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

    • 4.4affected
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6baffected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 15c4cc3850cfe1b973eb7b63c02314b267f06a64affected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 187069ccc3474516af32350e20d7e449160fa6deaffected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 81c9e7e4030e71391ab479c4c6e17b64802577aaaffected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 6c6ce2ccb4fcf1617fec83f91b21aa0265f30701affected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 742001919653e7313b4e91780c5d108be1692365affected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before 02beb178e2e159daeb8f992d7abb16a37da31664affected · git
    • 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 and later · before c02053a9055d5fdfd32432287cca8958db1d5bc5affected · git
    • before 4.4not affected · semver

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 7.0.10-17.0.10-1

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-2026-53293Jun 26, 2026 · drm/amdgpu: fix AMDGPU_INFO_READ_MMR_REG
    22Monitor
  • ← EarlierCVE-2026-53294Jun 26, 2026 · mailbox: mailbox-test: don't free the reused channel
    31Monitor
  • Later →CVE-2026-53298Jun 26, 2026 · net: airoha: Move ndesc initialization at end of airoha_qdma_init_rx_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 Linux02beb178e2e159daeb8f992d7abb16a37da31664Vendor (CNA)
Linux Linux0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6bVendor (CNA)
Linux Linux15c4cc3850cfe1b973eb7b63c02314b267f06a64Vendor (CNA)
Linux Linux187069ccc3474516af32350e20d7e449160fa6deVendor (CNA)
Linux Linux6c6ce2ccb4fcf1617fec83f91b21aa0265f30701Vendor (CNA)
Linux Linux742001919653e7313b4e91780c5d108be1692365Vendor (CNA)
Linux Linux81c9e7e4030e71391ab479c4c6e17b64802577aaVendor (CNA)
Linux Linuxc02053a9055d5fdfd32432287cca8958db1d5bc5Vendor (CNA)
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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

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