CVE-2023-54020 (GCVE-0-2023-54020)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2026-05-23 15:31
VLAI
Title
dmaengine: sf-pdma: pdma_desc memory leak fix
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ab2782c944e324008ef5d658f2494a9f0e3c5ac , < ad222c9af25e3f074c180e389b3477dce42afc4f (git)
Affected: b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc , < 03fece43fa109beba7cc9948c02f5e2d1205d607 (git)
Affected: b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc , < 8bd5040bd43f2b5ba3c898b09a3197a0c7ace126 (git)
Affected: b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc , < b02e07015a5ac7bbc029da931ae17914b8ae0339 (git)
Affected: b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11 (git)
Affected: 4c7350b1dd8a192af844de32fc99b9e34c876fda (git)
Affected: a93b3f1e11971a91b6441b6d47488f4492cc113f (git)
Affected: 5.15.61 , < 5.15.99 (semver)
Affected: 5.10.137 , < 5.11 (semver)
Affected: 5.18.18 , < 5.19 (semver)
Affected: 5.19.2 , < 5.20 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 5.15.99 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: pdma_desc memory leak fix\n\nCommit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread support for a\nDMA channel\") changed sf_pdma_prep_dma_memcpy() to unconditionally\nallocate a new sf_pdma_desc each time it is called.\n\nThe driver previously recycled descs, by checking the in_use flag, only\nallocating additional descs if the existing one was in use. This logic\nwas removed in commit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread\nsupport for a DMA channel\"), but sf_pdma_free_desc() was not changed to\nhandle the new behaviour.\n\nAs a result, each time sf_pdma_prep_dma_memcpy() is called, the previous\ndescriptor is leaked, over time leading to memory starvation:\n\n  unreferenced object 0xffffffe008447300 (size 192):\n  comm \"irq/39-mchp_dsc\", pid 343, jiffies 4294906910 (age 981.200s)\n  hex dump (first 32 bytes):\n    00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00  ................\n    00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00  ..p.............\n  backtrace:\n    [\u003c00000000064a04f4\u003e] kmemleak_alloc+0x1e/0x28\n    [\u003c00000000018927a7\u003e] kmem_cache_alloc+0x11e/0x178\n    [\u003c000000002aea8d16\u003e] sf_pdma_prep_dma_memcpy+0x40/0x112\n\nAdd the missing kfree() to sf_pdma_free_desc(), and remove the redundant\nin_use flag."
        }
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        "shortName": "Linux"
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        {
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      "title": "dmaengine: sf-pdma: pdma_desc memory leak fix",
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    "datePublished": "2025-12-24T10:55:50.583Z",
    "dateReserved": "2025-12-24T10:53:46.179Z",
    "dateUpdated": "2026-05-23T15:31:58.250Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: pdma_desc memory leak fix\n\nCommit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread support for a\nDMA channel\") changed sf_pdma_prep_dma_memcpy() to unconditionally\nallocate a new sf_pdma_desc each time it is called.\n\nThe driver previously recycled descs, by checking the in_use flag, only\nallocating additional descs if the existing one was in use. This logic\nwas removed in commit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread\nsupport for a DMA channel\"), but sf_pdma_free_desc() was not changed to\nhandle the new behaviour.\n\nAs a result, each time sf_pdma_prep_dma_memcpy() is called, the previous\ndescriptor is leaked, over time leading to memory starvation:\n\n  unreferenced object 0xffffffe008447300 (size 192):\n  comm \"irq/39-mchp_dsc\", pid 343, jiffies 4294906910 (age 981.200s)\n  hex dump (first 32 bytes):\n    00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00  ................\n    00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00  ..p.............\n  backtrace:\n    [\u003c00000000064a04f4\u003e] kmemleak_alloc+0x1e/0x28\n    [\u003c00000000018927a7\u003e] kmem_cache_alloc+0x11e/0x178\n    [\u003c000000002aea8d16\u003e] sf_pdma_prep_dma_memcpy+0x40/0x112\n\nAdd the missing kfree() to sf_pdma_free_desc(), and remove the redundant\nin_use flag."
          }
        ],
        "id": "CVE-2023-54020",
        "lastModified": "2026-06-17T06:46:33.090",
        "metrics": {},
        "published": "2025-12-24T11:15:55.003",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:15:46+00:00",
      "cve": "CVE-2023-54020",
      "id": "CVE-2023-54020",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dmaengine: sf-pdma: pdma_desc memory leak fix",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54020.json",
      "version": "3"
    }
  }
}



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