CVE-2026-46300 (GCVE-0-2026-46300)
Vulnerability from cvelistv5
Published
2026-05-23 11:44
Modified
2026-05-30 10:49
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
References
Impacted products
Vendor Product Version
Linux Linux Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
Version: cef401de7be8c4e155c6746bfccf721a4fa5fab9
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-05-23T12:24:19.703Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/13/5"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/21/11"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/21/12"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/21/13"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3599e6b3cc1ada96883d496a50a210d3afbb6987",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "9d3e5fd19fe1063bf607219e8562fbd567b8e8d5",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "78bf6b6bb19541d19fbda6242e7cfe2c682763c0",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "3bd9e113d50034db99d7ef69fd8e5242d15e414a",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "3884358a9286b17f389a72b1426fc4547c23c111",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            },
            {
              "lessThan": "f84eca5817390257cef78013d0112481c503b4a3",
              "status": "affected",
              "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.257",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.208",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.174",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.257",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.208",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.174",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc5",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to.  If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers.  In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data().  If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags.  The tailroom copy path does not need the marker because it copies\nbytes into @to\u0027s linear data rather than transferring frag descriptors."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-30T10:49:36.824Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111"
        },
        {
          "url": "https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3"
        }
      ],
      "title": "net: skbuff: preserve shared-frag marker during coalescing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46300",
    "datePublished": "2026-05-23T11:44:02.231Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-05-30T10:49:36.824Z",
    "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.