Vulnerability-Lookup

FKIE_CVE-2026-45940

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48

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

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-45940",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:10.193",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-45940 (GCVE-0-2026-45940)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17

Title

net: stmmac: fix oops when split header is enabled

Summary

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b1f23df09e7dbf4c8…
https://git.kernel.org/stable/c/36f81cb7d82e9614a…
https://git.kernel.org/stable/c/babab1b42ed68877e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ec222003bd948de8f3ffbca522d328af1a8452ad , < b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609 (git) Affected: ec222003bd948de8f3ffbca522d328af1a8452ad , < 36f81cb7d82e9614a7058da6abdf2e3a03993df1 (git) Affected: ec222003bd948de8f3ffbca522d328af1a8452ad , < babab1b42ed68877ef669a08384becf281ad2582 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-45940

CVE-2026-45940 (GCVE-0-2026-45940)

Tags

Sightings

Nomenclature