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NVD / CVE Program· CNA Linux

CVE-2026-64234: tty: serial: pch_uart: add check for dma_alloc_coherent()

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: 0.11% (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 5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf, 66f8bfea055b23719b4fd6ce207c44de37d82a59, 6dd5c0ea139b586ad5a091677056dafd405cfe82.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf, 66f8bfea055b23719b4fd6ce207c44de37d82a59, 6dd5c0ea139b586ad5a091677056dafd405cfe82 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: tty: serial: pch_uart: add check for dma_alloc_coherent() Add a check for dma_alloc_coherent() failure to prevent a potential NULL pointer dereference in dma_handle_rx(). Properly release DMA channels and the PCI device reference using a goto ladder if the allocation fails.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 24, 2026
Updated
Nov 8, 2026
EPSS
0.1% · 1th 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 · 0.1%

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.

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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 kernel2.6.38 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 6.12.93
  • linux linux kernel6.13 and later · before 6.18.35
  • linux linux kernel6.19 and later · before 7.0.12
  • 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

    • 2.6.38affected
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before 760df81763b391bb5f0dcb0b7597b736da753ae4affected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before 5f2e2a240dc1846e049bc67e9c3cdf5b031d08bfaffected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before daea997bb244aeb50cbb2e5e075fb446a6cf068faffected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before 6dd5c0ea139b586ad5a091677056dafd405cfe82affected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before d846df2dfbc2469a688833b4cc4f8aa80672bde8affected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before 66f8bfea055b23719b4fd6ce207c44de37d82a59affected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before d8d53a343ebe74274ca17b1e1993042e99f8c863affected · git
    • 3c6a483275f47a2ef7119309ad3d791c10cf30da and later · before 6fe472c1bbbe238e91141f7cabc1226e96a60d43affected · git
    • before 2.6.38not 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 7.0.12-17.0.12-1

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-2026-64232Jul 24, 2026 · block: recompute nr_integrity_segments in blk_insert_cloned_request
    39Monitor
  • ← EarlierCVE-2026-64233Jul 24, 2026 · usb: gadget: uvc: hold opts->lock across XU walks in uvc_function_bind
    22Monitor
  • Later →CVE-2026-64235Jul 24, 2026 · x86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
    32Monitor

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 Linux5f2e2a240dc1846e049bc67e9c3cdf5b031d08bfVendor (CNA)
Linux Linux66f8bfea055b23719b4fd6ce207c44de37d82a59Vendor (CNA)
Linux Linux6dd5c0ea139b586ad5a091677056dafd405cfe82Vendor (CNA)
Linux Linux6fe472c1bbbe238e91141f7cabc1226e96a60d43Vendor (CNA)
Linux Linux760df81763b391bb5f0dcb0b7597b736da753ae4Vendor (CNA)
Linux Linuxd846df2dfbc2469a688833b4cc4f8aa80672bde8Vendor (CNA)
Linux Linuxd8d53a343ebe74274ca17b1e1993042e99f8c863Vendor (CNA)
Linux Linuxdaea997bb244aeb50cbb2e5e075fb446a6cf068fVendor (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
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-476 · NULL Pointer Dereference

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 (7 more)

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

All records