Vulnerability-Lookup

FKIE_CVE-2026-46300

Vulnerability from fkie_nvd - Published: 2026-05-23 12:17 - Updated: 2026-05-30 11:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3	Patch
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/13/5	Mailing List
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/21/11	Mailing List
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/21/12	Mailing List
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/21/13	Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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CVE-2026-46300 (GCVE-0-2026-46300)

Vulnerability from cvelistv5 – Published: 2026-05-23 11:44 – Updated: 2026-06-14 18:07

Title

net: skbuff: preserve shared-frag marker during coalescing

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

12 references

URL	Tags
https://git.kernel.org/stable/c/3599e6b3cc1ada968…
https://git.kernel.org/stable/c/2f2b16022a2e10ca7…
https://git.kernel.org/stable/c/9d3e5fd19fe1063bf…
https://git.kernel.org/stable/c/78bf6b6bb19541d19…
https://git.kernel.org/stable/c/760e1addc27ba1a7b…
https://git.kernel.org/stable/c/3bd9e113d50034db9…
https://git.kernel.org/stable/c/3884358a9286b17f3…
https://git.kernel.org/stable/c/f84eca5817390257c…
http://www.openwall.com/lists/oss-security/2026/05/13/5
http://www.openwall.com/lists/oss-security/2026/0…
http://www.openwall.com/lists/oss-security/2026/0…
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3599e6b3cc1ada96883d496a50a210d3afbb6987 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 78bf6b6bb19541d19fbda6242e7cfe2c682763c0 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3bd9e113d50034db99d7ef69fd8e5242d15e414a (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3884358a9286b17f389a72b1426fc4547c23c111 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < f84eca5817390257cef78013d0112481c503b4a3 (git)
Linux	Linux	Affected: 3.9 Unaffected: 0 , < 3.9 (semver) Unaffected: 5.10.257 , ≤ 5.10.* (semver) Unaffected: 5.15.208 , ≤ 5.15.* (semver) Unaffected: 6.1.174 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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                  "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",
                  "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": "2026-06-14T18:07:34.359Z",
        "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": "2026-06-14T18:07:34.359Z",
    "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-2026-46300

CVE-2026-46300 (GCVE-0-2026-46300)

Tags

Sightings

Nomenclature