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CVE-2023-54020· NVD / CVE Program· CNA Linux

dmaengine: sf-pdma: pdma_desc memory leak fix

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 03fece43fa109beba7cc9948c02f5e2d1205d607, 5.11, 5.15.99.

Low priority for now. Upgrade to Linux Linux 03fece43fa109beba7cc9948c02f5e2d1205d607, 5.11, 5.15.99 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: dmaengine: sf-pdma: pdma_desc memory leak fix Commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel") changed sf_pdma_prep_dma_memcpy() to unconditionally allocate a new sf_pdma_desc each time it is called. The driver previously recycled descs, by checking the in_use flag, only allocating additional descs if the existing one was in use. This logic was removed in commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel"), but sf_pdma_free_desc() was not changed to handle the new behaviour. As a result, each time sf_pdma_prep_dma_memcpy() is called, the previous descriptor is leaked, over time leading to memory starvation: unreferenced object 0xffffffe008447300 (size 192): comm "irq/39-mchp_dsc", pid 343, jiffies 4294906910 (age 981.200s) hex dump (first 32 bytes): 00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00 ................ 00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00 ..p............. backtrace: [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28 [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178 [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112 Add the missing kfree() to sf_pdma_free_desc(), and remove the redundant in_use flag.

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • A fix has been released

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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.

—

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

    • b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11, 4c7350b1dd8a192af844de32fc99b9e34c876fda, a93b3f1e11971a91b6441b6d47488f4492cc113f, 6.0affected
    • 5ab2782c944e324008ef5d658f2494a9f0e3c5ac and later · before ad222c9af25e3f074c180e389b3477dce42afc4faffected · git
    • b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc and later · before 03fece43fa109beba7cc9948c02f5e2d1205d607affected · git
    • b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc and later · before 8bd5040bd43f2b5ba3c898b09a3197a0c7ace126affected · git
    • b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc and later · before b02e07015a5ac7bbc029da931ae17914b8ae0339affected · git
    • 5.15.61 and later · before 5.15.99affected · semver
    • 5.10.137 and later · before 5.11affected · semver
    • 5.18.18 and later · before 5.19affected · semver
    • 5.19.2 and later · before 5.20affected · semver
    • before 6.0not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.20-16.1.20-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-54017Dec 24, 2025 · powerpc/pseries: fix possible memory leak in ibmebus_bus_init()
    0Monitor
  • ← EarlierCVE-2023-54018Dec 24, 2025 · drm/msm/hdmi: Add missing check for alloc_ordered_workqueue
    0Monitor
  • Later →CVE-2023-54021Dec 24, 2025 · ext4: set goal start correctly in ext4_mb_normalize_request
    0Monitor

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 Linux03fece43fa109beba7cc9948c02f5e2d1205d607Vendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.15.99Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux8bd5040bd43f2b5ba3c898b09a3197a0c7ace126Vendor (CNA)
Linux Linuxad222c9af25e3f074c180e389b3477dce42afc4fVendor (CNA)
Linux Linuxb02e07015a5ac7bbc029da931ae17914b8ae0339Vendor (CNA)
debian:linux6.1.20-1 · 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.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (3 more)

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

All records