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xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full The depth check in xfrm6_input_addr() is off by one: if (1 + sp->len == XFRM_MAX_DEPTH) goto drop; ... sp->xvec[sp->len++] = x; xfrm_input() can leave sp->len == XFRM_MAX_DEPTH, and the transport-mode receive path re-enters IPv6 input via xfrm_trans_reinject() with that secpath preserved. If the inner packet carries a destination-options HAO option or a type-2 routing header, xfrm6_input_addr() is called with sp->len == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so sp->xvec[sp->len++] writes one slot past the 6-element xvec[]. The write stays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS flags it and panics under panic_on_warn. Use "sp->len >= XFRM_MAX_DEPTH", matching xfrm_input(). This also restores one chain level the old check rejected at sp->len == 5. UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10 index 6 is out of range for type 'xfrm_state *[6]'

Announced Source revision 1
Original source ↗

CVE-2026-89783

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-2026-89783

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": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "91fc387f63c00ddfb5221127a17bac97549a8343",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "68e8737fe8e72f085c608cff322b3d2de8340af1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "bdcda866c89f9a8b1acdabf02d26cde9fbe501d8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "48996649222e95008cdb98cd58579e3fc8e5ee06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "0f679e0523ddfff3fb554336ceb874b0e51e9cd3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "5f35a29a5eed3d80befd32050843ac88dea3d61a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9473e1f631de339c50bde1e3bd09e1045fe90fd5",
        "lessThan": "5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/xfrm6_input.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.25"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.25",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "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/ipv6/xfrm6_input.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89783

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#36253 · Revision 1
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Publisher date
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