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esp: do not unref managed frag pages in esp_ssg_unref()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: esp: do not unref managed frag pages in esp_ssg_unref() esp_ssg_unref() releases the page references held on the source scatterlist after the AEAD operation completes. It calls skb_page_unref() on every frag page for an out-of-place transform (req->src != req->dst), and in the error path of esp_output_tail() (already_unref == true) on the request's own scatterlist. This is wrong when the skb carries managed frags (SKBFL_MANAGED_FRAG_REFS). Managed frags are owned by a zerocopy ubuf and the skb does not hold a per-frag page reference; io_uring SEND_ZC with a registered buffer attaches the bvec pages this way via io_sg_from_iter(). The rest of the stack honours this invariant: skb_release_data() skips the per-frag unref when SKBFL_MANAGED_FRAG_REFS is set, and skb_zcopy_managed() is the guard used at the other unref sites. esp_ssg_unref() is missing that guard, so for a managed-frag skb it drops a page reference the skb never acquired. This can underflow the page reference count and free a page that is still in use. Guard the function with skb_zcopy_managed() so both unref paths are skipped for managed-frag skbs, matching skb_release_data().

Announced Source revision 1
Original source ↗

CVE-2026-93105

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-2026-93105

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "cac2661c53f35cbe651bef9b07026a5a05ab8ce0",
        "lessThan": "201bdf10ae92e7cbd524adf8c0323e2a963d5fd7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cac2661c53f35cbe651bef9b07026a5a05ab8ce0",
        "lessThan": "3ec55f0c8a6a543cf660584d1346e11f6311ee59",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cac2661c53f35cbe651bef9b07026a5a05ab8ce0",
        "lessThan": "1ad6456898f6e6cf58be83bdb607acb1119a9cd1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cac2661c53f35cbe651bef9b07026a5a05ab8ce0",
        "lessThan": "26b6b14c7a0368e317a1e9fb5144ebe6f8d495cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cac2661c53f35cbe651bef9b07026a5a05ab8ce0",
        "lessThan": "21697720ff43b8dfa25b8e8d9ca7f56f4597fc80",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/esp4.c",
      "net/ipv6/esp6.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/esp4.c",
      "net/ipv6/esp6.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93105

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#48711 · Revision 1
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Publisher date
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