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vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.

Announced Source revision 1
Original source ↗

CVE-2026-63993

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-2026-63993

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": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "6b8bfce9d2f774d2c2243e0248e03efb99bba6c0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "9257f56ac47ef1976bcd056cf986a9988eeec67a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "8d435d68d71fb875876b722f4136caf74f2f48bd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "dc3bfa050f873371e745bdf478b1f5b738e5733d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "609e63312c29aad18026a1d3222e123d4b6b0feb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "5303925e360527243b46a440a04667826bbc72b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "a493efd4336cf19122ae0e4cbb3d31b32d70deea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
        "lessThan": "7d9ef0cb271555d8cf39fefe6c981e1493b25ecf",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/vxlan/vxlan_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/vxlan/vxlan_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63993

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40922 · Revision 1
Added to Heist Feed
Publisher date
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