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CVE-2026-80846 (GCVE-0-2026-80846)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
xfrm: drop ESP-in-TCP packets with no ingress device
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: drop ESP-in-TCP packets with no ingress device ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path. Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device. Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 239d0f71af09dc2029fd4d730cb24b8c83aaa43a (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < f00235f9d12301183d61f75fbe4105506f3e5140 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 6af5cdb03819a5ce6e945992635c6c5e91045367 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 2dd1609cadff46c4b20ce53b91ab9cce1380456a (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < c296d25efbc840be24de83f56d43bc47e714ace9 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 328e40aa774b446969c69b654c52a051a95af8a1 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 7911e0236616487b89db6bd3ba3f408abd10eb23 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 943d95233b8b4a88994e244fcf466f8c403d63f1 (git)
Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < e1d7c5ac1c246ce5775f604515de0a59fbf2116e (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
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              "version": "7.2.3",
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: drop ESP-in-TCP packets with no ingress device\n\nESP-in-TCP receives records through the TCP strparser. handle_esp()\nrestores skb-\u003edev from the saved skb_iif before passing the packet into\nthe XFRM input path.\n\nQueued TCP data can be processed after the original ingress device has\nbeen removed, for example during veth or net namespace teardown. In that\ncase dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input\npaths both expect skb-\u003edev to be valid while building the route lookup,\nso queued ESP-in-TCP data can dereference a NULL device.\n\nDrop the packet if the saved ingress device can no longer be resolved.\nSuch a packet can no longer be routed through the normal XFRM receive\npath, and this preserves the existing behaviour for packets whose ingress\ndevice still exists."
        }
      ],
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        "dateUpdated": "2026-09-04T15:54:56.492Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a"
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        {
          "url": "https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140"
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        {
          "url": "https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e"
        }
      ],
      "title": "xfrm: drop ESP-in-TCP packets with no ingress device",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80846",
    "datePublished": "2026-09-04T15:54:56.492Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-09-04T15:54:56.492Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-14",
      "epss": "0.00195",
      "percentile": "0.09374"
    },
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      "cve": "CVE-2026-80846",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "xfrm: drop ESP-in-TCP packets with no ingress device",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80846.json",
      "version": "3"
    },
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The XFRM IPv4 and IPv6 input\\npaths both expect skb-\u003edev to be valid while building the route lookup,\\nso queued ESP-in-TCP data can dereference a NULL device.\\n\\nDrop the packet if the saved ingress device can no longer be resolved.\\nSuch a packet can no longer be routed through the normal XFRM receive\\npath, and this preserves the existing behaviour for packets whose ingress\\ndevice still exists.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/espintcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"239d0f71af09dc2029fd4d730cb24b8c83aaa43a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"f00235f9d12301183d61f75fbe4105506f3e5140\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"6af5cdb03819a5ce6e945992635c6c5e91045367\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"2dd1609cadff46c4b20ce53b91ab9cce1380456a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"c296d25efbc840be24de83f56d43bc47e714ace9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"328e40aa774b446969c69b654c52a051a95af8a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"7911e0236616487b89db6bd3ba3f408abd10eb23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"943d95233b8b4a88994e244fcf466f8c403d63f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\"lessThan\":\"e1d7c5ac1c246ce5775f604515de0a59fbf2116e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/espintcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"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/239d0f71af09dc2029fd4d730cb24b8c83aaa43a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:50:41Z",
      "cve": "CVE-2026-80846",
      "id": "CVE-2026-80846",
      "initial_release_date": "2026-09-05T00:26:19Z",
      "product_status:known_affected": "224",
      "product_status:known_not_affected": "117",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80846",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80846.json",
      "version": "4"
    }
  }
}



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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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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