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CVE-2026-80840 (GCVE-0-2026-80840)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
ipv6: seg6: clear IPv4 control block on IPIP decapsulation
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: seg6: clear IPv4 control block on IPIP decapsulation End.DX4 and End.DT4 decapsulate an IPv4 packet through decap_and_validate() and send it directly to IPv4 routing. The inner packet therefore bypasses ip_rcv_core(), which normally clears IPCB before IPv4 interprets skb->cb. The skb instead retains IP6CB data from the outer packet. IP6CB and IPCB use the same skb->cb storage, so IP6CB(skb)->lastopt overlaps IPCB(skb)->opt.optlen and srr, while IP6CB(skb)->nhoff overlaps rr and ts. The sender can make the stale optlen byte nonzero with a valid outer extension-header chain. The reproducers put an eight-byte Destination Options header immediately after the 40-byte IPv6 header and before the Segment Routing Header. ipv6_destopt_rcv() records the sender-controlled Destination Options offset in both lastopt and nhoff, setting them to 40. On the reproduced little-endian x86-64 kernel, IPv4 therefore sees optlen = 40 and rr = 40. Both tcp_v4_save_options() and __ip_options_echo() skip option copying when optlen is zero. Here optlen is 40, so the TCP SYN path allocates room for 40 bytes of option data and calls __ip_options_echo(). The stale rr value makes that function read inner packet byte 41 as the Record Route option length. The reproducers set that sender-controlled byte to 255, so __ip_options_echo() copies 255 bytes into the 40-byte option-data area. Separate End.DX4 and End.DT4 reproducers on the unpatched v7.2-rc5 kernel both produced: BUG: KASAN: slab-out-of-bounds in __ip_options_echo() Write of size 255 The relevant End.DX4 call path is: __ip_options_echo tcp_v4_route_req tcp_conn_request tcp_v4_conn_request tcp_rcv_state_process tcp_v4_do_rcv tcp_v4_rcv ip_protocol_deliver_rcu ip_local_deliver_finish ip_local_deliver input_action_end_dx4_finish input_action_end_dx4 The relevant End.DT4 call path is: __ip_options_echo tcp_v4_route_req tcp_conn_request tcp_v4_conn_request tcp_rcv_state_process tcp_v4_do_rcv tcp_v4_rcv ip_protocol_deliver_rcu ip_local_deliver_finish ip_local_deliver input_action_end_dt4 tcp_v4_save_options() is inlined into the tcp_v4_route_req() path, so it does not appear as a separate frame. When decap_and_validate() handles IPPROTO_IPIP, save the ingress interface from IP6CB, clear IPCB, and restore the saved value. Doing this in the common decapsulation path covers End.DX4, End.DT4, and End.DT46's IPv4 arm. Use IP6CB(skb)->iif rather than skb->skb_iif. These actions run after l3mdev processing, which can replace skb_iif with the L3 master; IP6CB iif still records the receiving interface set at IPv6 ingress.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < 10fd1a8f58ac619a9e251f2858e2e2c8fd6cd667 (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < eb0f422487228e140f3d609b032ac61aedcab8fa (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < 9039e4f3e1c0ffe2b575b655b3f58fdd10f7e40c (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < f52f1e75716d2ee49e013edf204ac92337c72fd8 (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < 0e3f01fe2e704e76af4385b8a1742641885a191c (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < 3e4476e58343fb8f2fffced9e22d935376b17aaf (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < bf1c1151560d11036a144d917fa4c131831342d7 (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < f4be3b391265e24c7720fc867c50062b436acf33 (git)
Affected: 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 , < 44930446dde45a7a90fe1446fa38eb0e2c561646 (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (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)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: seg6: clear IPv4 control block on IPIP decapsulation\n\nEnd.DX4 and End.DT4 decapsulate an IPv4 packet through\ndecap_and_validate() and send it directly to IPv4 routing. The inner\npacket therefore bypasses ip_rcv_core(), which normally clears IPCB\nbefore IPv4 interprets skb-\u003ecb.\n\nThe skb instead retains IP6CB data from the outer packet. IP6CB and\nIPCB use the same skb-\u003ecb storage, so IP6CB(skb)-\u003elastopt overlaps\nIPCB(skb)-\u003eopt.optlen and srr, while IP6CB(skb)-\u003enhoff overlaps rr and\nts.\n\nThe sender can make the stale optlen byte nonzero with a valid outer\nextension-header chain. The reproducers put an eight-byte Destination\nOptions header immediately after the 40-byte IPv6 header and before the\nSegment Routing Header. ipv6_destopt_rcv() records the sender-controlled\nDestination Options offset in both lastopt and nhoff, setting them to\n40. On the reproduced little-endian x86-64 kernel, IPv4 therefore sees\noptlen = 40 and rr = 40.\n\nBoth tcp_v4_save_options() and __ip_options_echo() skip option copying\nwhen optlen is zero. Here optlen is 40, so the TCP SYN path allocates\nroom for 40 bytes of option data and calls __ip_options_echo(). The\nstale rr value makes that function read inner packet byte 41 as the\nRecord Route option length. The reproducers set that sender-controlled\nbyte to 255, so __ip_options_echo() copies 255 bytes into the 40-byte\noption-data area.\n\nSeparate End.DX4 and End.DT4 reproducers on the unpatched v7.2-rc5\nkernel both produced:\n\n  BUG: KASAN: slab-out-of-bounds in __ip_options_echo()\n  Write of size 255\n\nThe relevant End.DX4 call path is:\n\n  __ip_options_echo\n  tcp_v4_route_req\n  tcp_conn_request\n  tcp_v4_conn_request\n  tcp_rcv_state_process\n  tcp_v4_do_rcv\n  tcp_v4_rcv\n  ip_protocol_deliver_rcu\n  ip_local_deliver_finish\n  ip_local_deliver\n  input_action_end_dx4_finish\n  input_action_end_dx4\n\nThe relevant End.DT4 call path is:\n\n  __ip_options_echo\n  tcp_v4_route_req\n  tcp_conn_request\n  tcp_v4_conn_request\n  tcp_rcv_state_process\n  tcp_v4_do_rcv\n  tcp_v4_rcv\n  ip_protocol_deliver_rcu\n  ip_local_deliver_finish\n  ip_local_deliver\n  input_action_end_dt4\n\ntcp_v4_save_options() is inlined into the tcp_v4_route_req() path, so\nit does not appear as a separate frame.\n\nWhen decap_and_validate() handles IPPROTO_IPIP, save the ingress\ninterface from IP6CB, clear IPCB, and restore the saved value. Doing\nthis in the common decapsulation path covers End.DX4, End.DT4, and\nEnd.DT46\u0027s IPv4 arm.\n\nUse IP6CB(skb)-\u003eiif rather than skb-\u003eskb_iif. These actions run after\nl3mdev processing, which can replace skb_iif with the L3 master;\nIP6CB iif still records the receiving interface set at IPv6 ingress."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:54:50.403Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/10fd1a8f58ac619a9e251f2858e2e2c8fd6cd667"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb0f422487228e140f3d609b032ac61aedcab8fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/9039e4f3e1c0ffe2b575b655b3f58fdd10f7e40c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f52f1e75716d2ee49e013edf204ac92337c72fd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e3f01fe2e704e76af4385b8a1742641885a191c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e4476e58343fb8f2fffced9e22d935376b17aaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf1c1151560d11036a144d917fa4c131831342d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4be3b391265e24c7720fc867c50062b436acf33"
        },
        {
          "url": "https://git.kernel.org/stable/c/44930446dde45a7a90fe1446fa38eb0e2c561646"
        }
      ],
      "title": "ipv6: seg6: clear IPv4 control block on IPIP decapsulation",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80840",
    "datePublished": "2026-09-04T15:54:50.403Z",
    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-04T15:54:50.403Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80840",
      "date": "2026-09-15",
      "epss": "0.00205",
      "percentile": "0.10657"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T02:04:04.000Z",
      "cve": "CVE-2026-80840",
      "id": "msrc_CVE-2026-80840",
      "initial_release_date": "2026-09-06T04:36:50.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ipv6: seg6: clear IPv4 control block on IPIP decapsulation",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80840.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80840\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:12.440\",\"lastModified\":\"2026-09-04T16:18:12.440\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: seg6: clear IPv4 control block on IPIP decapsulation\\n\\nEnd.DX4 and End.DT4 decapsulate an IPv4 packet through\\ndecap_and_validate() and send it directly to IPv4 routing. The inner\\npacket therefore bypasses ip_rcv_core(), which normally clears IPCB\\nbefore IPv4 interprets skb-\u003ecb.\\n\\nThe skb instead retains IP6CB data from the outer packet. IP6CB and\\nIPCB use the same skb-\u003ecb storage, so IP6CB(skb)-\u003elastopt overlaps\\nIPCB(skb)-\u003eopt.optlen and srr, while IP6CB(skb)-\u003enhoff overlaps rr and\\nts.\\n\\nThe sender can make the stale optlen byte nonzero with a valid outer\\nextension-header chain. The reproducers put an eight-byte Destination\\nOptions header immediately after the 40-byte IPv6 header and before the\\nSegment Routing Header. ipv6_destopt_rcv() records the sender-controlled\\nDestination Options offset in both lastopt and nhoff, setting them to\\n40. On the reproduced little-endian x86-64 kernel, IPv4 therefore sees\\noptlen = 40 and rr = 40.\\n\\nBoth tcp_v4_save_options() and __ip_options_echo() skip option copying\\nwhen optlen is zero. Here optlen is 40, so the TCP SYN path allocates\\nroom for 40 bytes of option data and calls __ip_options_echo(). The\\nstale rr value makes that function read inner packet byte 41 as the\\nRecord Route option length. The reproducers set that sender-controlled\\nbyte to 255, so __ip_options_echo() copies 255 bytes into the 40-byte\\noption-data area.\\n\\nSeparate End.DX4 and End.DT4 reproducers on the unpatched v7.2-rc5\\nkernel both produced:\\n\\n  BUG: KASAN: slab-out-of-bounds in __ip_options_echo()\\n  Write of size 255\\n\\nThe relevant End.DX4 call path is:\\n\\n  __ip_options_echo\\n  tcp_v4_route_req\\n  tcp_conn_request\\n  tcp_v4_conn_request\\n  tcp_rcv_state_process\\n  tcp_v4_do_rcv\\n  tcp_v4_rcv\\n  ip_protocol_deliver_rcu\\n  ip_local_deliver_finish\\n  ip_local_deliver\\n  input_action_end_dx4_finish\\n  input_action_end_dx4\\n\\nThe relevant End.DT4 call path is:\\n\\n  __ip_options_echo\\n  tcp_v4_route_req\\n  tcp_conn_request\\n  tcp_v4_conn_request\\n  tcp_rcv_state_process\\n  tcp_v4_do_rcv\\n  tcp_v4_rcv\\n  ip_protocol_deliver_rcu\\n  ip_local_deliver_finish\\n  ip_local_deliver\\n  input_action_end_dt4\\n\\ntcp_v4_save_options() is inlined into the tcp_v4_route_req() path, so\\nit does not appear as a separate frame.\\n\\nWhen decap_and_validate() handles IPPROTO_IPIP, save the ingress\\ninterface from IP6CB, clear IPCB, and restore the saved value. Doing\\nthis in the common decapsulation path covers End.DX4, End.DT4, and\\nEnd.DT46\u0027s IPv4 arm.\\n\\nUse IP6CB(skb)-\u003eiif rather than skb-\u003eskb_iif. These actions run after\\nl3mdev processing, which can replace skb_iif with the L3 master;\\nIP6CB iif still records the receiving interface set at IPv6 ingress.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/seg6_local.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"10fd1a8f58ac619a9e251f2858e2e2c8fd6cd667\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"eb0f422487228e140f3d609b032ac61aedcab8fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"9039e4f3e1c0ffe2b575b655b3f58fdd10f7e40c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"f52f1e75716d2ee49e013edf204ac92337c72fd8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"0e3f01fe2e704e76af4385b8a1742641885a191c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"3e4476e58343fb8f2fffced9e22d935376b17aaf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"bf1c1151560d11036a144d917fa4c131831342d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"f4be3b391265e24c7720fc867c50062b436acf33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"891ef8dd2a8d14e4e73a81dcdb135b574c57f556\",\"lessThan\":\"44930446dde45a7a90fe1446fa38eb0e2c561646\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/seg6_local.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"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/0e3f01fe2e704e76af4385b8a1742641885a191c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/10fd1a8f58ac619a9e251f2858e2e2c8fd6cd667\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e4476e58343fb8f2fffced9e22d935376b17aaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44930446dde45a7a90fe1446fa38eb0e2c561646\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9039e4f3e1c0ffe2b575b655b3f58fdd10f7e40c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf1c1151560d11036a144d917fa4c131831342d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb0f422487228e140f3d609b032ac61aedcab8fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4be3b391265e24c7720fc867c50062b436acf33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f52f1e75716d2ee49e013edf204ac92337c72fd8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T01:50:49Z",
      "cve": "CVE-2026-80840",
      "id": "CVE-2026-80840",
      "initial_release_date": "2026-09-10T01:50:49Z",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "93",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80840",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80840.json",
      "version": "2"
    }
  }
}



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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.