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CVE-2026-72450 (GCVE-0-2026-72450)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:44
VLAI
Title
xfrm: validate selector family and prefixlen during match
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: validate selector family and prefixlen during match syzbot reported a shift-out-of-bounds in xfrm_selector_match() due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set). Fix this by: - Rejecting mismatched families in xfrm_selector_match. - Returning false in addr4_match if prefixlen > 32. - Returning false in addr_match if prefixlen > 128 (prevents overflow).
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 , < 87a5bbccc7ff4edb3f42fea387124237d2ba91ee (git)
Affected: 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 , < bd7f202cf77556cff59f68dc30e4cdf40cb6e33b (git)
Affected: bce1afaa212ec380bf971614f70909a27882b862 , < a3968ad4195d72c8fddcc6c0ef39da95ac98711a (git)
Affected: 7d9868180bd1e4cf37e7c5067362658971162366 , < efa9e3b9f3dea2e1ea4c7edf4edc863faef85986 (git)
Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 78783fefdc8f36879b1a17efa0d3195ea5f2dc5f (git)
Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe (git)
Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 5a03a2ee17e8259dde631ed84fd8322db06cb2ae (git)
Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 40f0b1047918539f0b0f795ac65e35336b4c2c78 (git)
Affected: f31398570acf0f0804c644006f7bfa9067106b0a (git)
Affected: 401ad99a5ae7180dd9449eac104cb755f442e7f3 (git)
Affected: e68dd80ba498265d2266b12dc3459164f4ff0c4a (git)
Affected: 5.10.229 , < 5.10.261 (semver)
Affected: 5.15.170 , < 5.15.212 (semver)
Affected: 6.1.115 , < 6.1.178 (semver)
Affected: 6.6.59 , < 6.6.145 (semver)
Affected: 4.19.323 , < 4.20 (semver)
Affected: 5.4.285 , < 5.5 (semver)
Affected: 6.11.6 , < 6.12 (semver)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen \u003e 32.\n- Returning false in addr_match if prefixlen \u003e 128 (prevents overflow)."
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The bug is armed via NETLINK_XFRM (XFRM_MSG_NEWSA with XFRM_STATE_AF_UNSPEC) in xfrm_user_rcv_msg(), and per kernel CNA guidance xfrm/netlink configuration is Local even though xfrm_selector_match() is later hit from IPv4/IPv6 packet processing in __xfrm_policy_check() and xfrm_state_look_at().\nAC:L - The attacker fully controls the malformed SA selector (AF_UNSPEC with prefixlen up to 255) and can deterministically trigger matching by sending or receiving IPv4/IPv6 traffic through xfrm; no race, victim state, or memory layout outside attacker control is required.\nPR:L - xfrm_user_rcv_msg() requires netlink_net_capable(CAP_NET_ADMIN), evaluated against the socket net namespace user_ns via ns_capable(); an unprivileged local user obtains CAP_NET_ADMIN with unshare -Urn and can install the poisoned SA and matching policy in that namespace.\nUI:N - The attacker performs the entire sequence\u2014installing the XFRM SA/policy over netlink and generating matching traffic\u2014with no action required from any other user, administrator, or victim.\nS:U - The shift-out-of-bounds and out-of-bounds memcmp reads occur entirely within kernel xfrm selector matching on the same host; no VM escape, IOMMU bypass, or cross-security-authority boundary is crossed.\nC:H - addr4_match() performs an undefined left-shift when prefixlen\u003e32 on IPv4 flows, and addr_match() can memcmp() up to (prefixlen\u003e\u003e5)\u003c\u003c2 bytes past 16-byte selector/flow addresses when prefixlen\u003e128 on IPv6, leaking adjacent kernel memory per CNA OOB-read guidance.\nI:H - C11 undefined-behavior shifts in hot-path packet classification and unchecked prefix comparisons can corrupt mask/offset arithmetic and selector-match control flow, giving attacker-influenced kernel behavior exploitable for integrity compromise per CNA memory-unsafe-operation guidance.\nA:H - syzbot reproduced UBSAN shift-out-of-bounds in xfrm_selector_match(), and undefined shifts plus out-of-bounds reads in the xfrm input/policy-check path can provoke kernel oops/panic (especially with panic_on_warn/KASAN), satisfying CNA guidance that kernel crashes are High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:19.730Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a"
        },
        {
          "url": "https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986"
        },
        {
          "url": "https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78"
        }
      ],
      "title": "xfrm: validate selector family and prefixlen during match",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72450",
    "datePublished": "2026-08-15T05:56:58.939Z",
    "dateReserved": "2026-08-09T03:40:39.931Z",
    "dateUpdated": "2026-08-17T05:44:19.730Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72450",
      "date": "2026-09-04",
      "epss": "0.00169",
      "percentile": "0.06415"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72450\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:18.950\",\"lastModified\":\"2026-08-17T06:19:12.517\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: validate selector family and prefixlen during match\\n\\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\\n\\nFix this by:\\n\\n- Rejecting mismatched families in xfrm_selector_match.\\n- Returning false in addr4_match if prefixlen \u003e 32.\\n- Returning false in addr_match if prefixlen \u003e 128 (prevents overflow).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/xfrm.h\",\"net/xfrm/xfrm_policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8df5cd51fd70c33aa1776e5cbcd82b0a86649d73\",\"lessThan\":\"87a5bbccc7ff4edb3f42fea387124237d2ba91ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71\",\"lessThan\":\"bd7f202cf77556cff59f68dc30e4cdf40cb6e33b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bce1afaa212ec380bf971614f70909a27882b862\",\"lessThan\":\"a3968ad4195d72c8fddcc6c0ef39da95ac98711a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7d9868180bd1e4cf37e7c5067362658971162366\",\"lessThan\":\"efa9e3b9f3dea2e1ea4c7edf4edc863faef85986\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\",\"lessThan\":\"78783fefdc8f36879b1a17efa0d3195ea5f2dc5f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\",\"lessThan\":\"6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\",\"lessThan\":\"5a03a2ee17e8259dde631ed84fd8322db06cb2ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\",\"lessThan\":\"40f0b1047918539f0b0f795ac65e35336b4c2c78\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f31398570acf0f0804c644006f7bfa9067106b0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"401ad99a5ae7180dd9449eac104cb755f442e7f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e68dd80ba498265d2266b12dc3459164f4ff0c4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.229\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.170\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.115\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.59\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.323\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.285\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.11.6\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/xfrm.h\",\"net/xfrm/xfrm_policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:46:13+00:00",
      "cve": "CVE-2026-72450",
      "id": "CVE-2026-72450",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: validate selector family and prefixlen during match",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72450.json",
      "version": "3"
    }
  }
}



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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

Author Source Type Date Other

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.