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xsk: tighten UMEM headroom validation to account for tailroom and min frame

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.

Announced Source revision 1
Original source ↗

CVE-2026-43093

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-2026-43093

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": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
        "lessThan": "5f123bc278bf4e3283d8606321bebbfd299f4384",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
        "lessThan": "1a6051cd7e3e4c54ff3854a43b638b9292af5e67",
        "versionType": "git"
      },
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      {
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        "versionType": "git"
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      {
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      {
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        "versionType": "git"
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      {
        "status": "affected",
        "version": "ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "25c9cdef57488578da21d99eb614b97ffcf6e59f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "98d3c852e63b49129515dd18c875999efaf8530a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.19.118",
        "lessThan": "4.20",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.4.35",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.6.7",
        "lessThan": "5.7",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/xdp/xdp_umem.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
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        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/xdp/xdp_umem.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43093

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40023 · Revision 1
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Publisher date
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