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net: skbuff: preserve shared-frag marker during coalescing

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-46300

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46300

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "3599e6b3cc1ada96883d496a50a210d3afbb6987",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "9d3e5fd19fe1063bf607219e8562fbd567b8e8d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "78bf6b6bb19541d19fbda6242e7cfe2c682763c0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "3bd9e113d50034db99d7ef69fd8e5242d15e414a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "3884358a9286b17f389a72b1426fc4547c23c111",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
        "lessThan": "f84eca5817390257cef78013d0112481c503b4a3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/core/skbuff.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.257",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.208",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.174",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/skbuff.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46300

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40170 · Revision 1
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Publisher date
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