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CVE-2026-89783 (GCVE-0-2026-89783)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 08:48
VLAI
Title
xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
Summary
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]'
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 91fc387f63c00ddfb5221127a17bac97549a8343 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 68e8737fe8e72f085c608cff322b3d2de8340af1 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < bdcda866c89f9a8b1acdabf02d26cde9fbe501d8 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 48996649222e95008cdb98cd58579e3fc8e5ee06 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 0f679e0523ddfff3fb554336ceb874b0e51e9cd3 (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 5f35a29a5eed3d80befd32050843ac88dea3d61a (git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc (git)
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Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "product": "Linux",
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            "net/ipv6/xfrm6_input.c"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "2.6.25",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "2.6.25",
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                  "versionStartIncluding": "2.6.25",
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                  "versionStartIncluding": "2.6.25",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\n\nThe depth check in xfrm6_input_addr() is off by one:\n\n  if (1 + sp-\u003elen == XFRM_MAX_DEPTH)\n          goto drop;\n  ...\n  sp-\u003exvec[sp-\u003elen++] = x;\n\nxfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\nsecpath preserved. If the inner packet carries a destination-options HAO\noption or a type-2 routing header, xfrm6_input_addr() is called with\nsp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\nsp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\nflags it and panics under panic_on_warn.\n\nUse \"sp-\u003elen \u003e= XFRM_MAX_DEPTH\", matching xfrm_input(). This also\nrestores one chain level the old check rejected at sp-\u003elen == 5.\n\n  UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\n  index 6 is out of range for type \u0027xfrm_state *[6]\u0027"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T08:48:21.761Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343"
        },
        {
          "url": "https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1"
        },
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          "url": "https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77"
        },
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        },
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          "url": "https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06"
        },
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          "url": "https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3"
        },
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          "url": "https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc"
        }
      ],
      "title": "xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89783",
    "datePublished": "2026-09-16T08:48:21.761Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-09-16T08:48:21.761Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89783\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T09:17:08.930\",\"lastModified\":\"2026-09-16T09:17:08.930\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\\n\\nThe depth check in xfrm6_input_addr() is off by one:\\n\\n  if (1 + sp-\u003elen == XFRM_MAX_DEPTH)\\n          goto drop;\\n  ...\\n  sp-\u003exvec[sp-\u003elen++] = x;\\n\\nxfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode\\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\\nsecpath preserved. If the inner packet carries a destination-options HAO\\noption or a type-2 routing header, xfrm6_input_addr() is called with\\nsp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\\nsp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write\\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\\nflags it and panics under panic_on_warn.\\n\\nUse \\\"sp-\u003elen \u003e= XFRM_MAX_DEPTH\\\", matching xfrm_input(). This also\\nrestores one chain level the old check rejected at sp-\u003elen == 5.\\n\\n  UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\\n  index 6 is out of range for type \u0027xfrm_state *[6]\u0027\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/xfrm6_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/xfrm6_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.