CVE-2026-45940 (GCVE-0-2026-45940)
Vulnerability from cvelistv5
Published
2026-05-27 12:17
Modified
2026-05-27 12:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix oops when split header is enabled For GMAC4, when split header is enabled, in some rare cases, the hardware does not fill buf2 of the first descriptor with payload. Thus we cannot assume buf2 is always fully filled if it is not the last descriptor. Otherwise, the length of buf2 of the second descriptor will be calculated wrong and cause an oops: Unable to handle kernel paging request at virtual address ffff00019246bfc0 ... x2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000 Call trace: dcache_inval_poc+0x28/0x58 (P) dma_direct_sync_single_for_cpu+0x38/0x6c __dma_sync_single_for_cpu+0x34/0x6c stmmac_napi_poll_rx+0x8f0/0xb60 __napi_poll.constprop.0+0x30/0x144 net_rx_action+0x160/0x274 handle_softirqs+0x1b8/0x1fc ... To fix this, the PL bit-field in RDES3 register is used for all descriptors, whether it is the last descriptor or not.
References
Impacted products
Vendor Product Version
Linux Linux Version: ec222003bd948de8f3ffbca522d328af1a8452ad
Version: ec222003bd948de8f3ffbca522d328af1a8452ad
Version: ec222003bd948de8f3ffbca522d328af1a8452ad
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609",
              "status": "affected",
              "version": "ec222003bd948de8f3ffbca522d328af1a8452ad",
              "versionType": "git"
            },
            {
              "lessThan": "36f81cb7d82e9614a7058da6abdf2e3a03993df1",
              "status": "affected",
              "version": "ec222003bd948de8f3ffbca522d328af1a8452ad",
              "versionType": "git"
            },
            {
              "lessThan": "babab1b42ed68877ef669a08384becf281ad2582",
              "status": "affected",
              "version": "ec222003bd948de8f3ffbca522d328af1a8452ad",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: fix oops when split header is enabled\n\nFor GMAC4, when split header is enabled, in some rare cases, the\nhardware does not fill buf2 of the first descriptor with payload.\nThus we cannot assume buf2 is always fully filled if it is not\nthe last descriptor. Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:56.350Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"
        },
        {
          "url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"
        },
        {
          "url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"
        }
      ],
      "title": "net: stmmac: fix oops when split header is enabled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45940",
    "datePublished": "2026-05-27T12:17:56.350Z",
    "dateReserved": "2026-05-13T15:03:33.087Z",
    "dateUpdated": "2026-05-27T12:17:56.350Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.