CVE-2026-99213 (GCVE-0-2026-99213)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:36 – Updated: 2026-10-31 12:45
VLAI
Title
vsock: treat TCP_CLOSING as once-established
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock: treat TCP_CLOSING as once-established Handle the TCP_ESTABLISHED -> TCP_CLOSING transition on OP_RST, which can race with the connect loop. Immediately break and return 0 on ESTABLISHED/CLOSING. The return value of connect() should reflect what happened up to the point the connection was established or failed. Events that occur afterwards must not affect it. E.g. even if OP_RW has already set sk_err, connect() should still return 0, not ENOBUFS because of it. Adapt the inaccurate comment above signal_pending(). Resetting a socket that is still present in connected_table can lead to memory corruption. The reporter noted lost transports for in-flight skbs, and I have reproduced crashes caused by re-insertion into connected_table. list_add double add: new=, prev=, next=. kernel BUG at lib/list_debug.c:35! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI Workqueue: vsock-loopback vsock_loopback_work RIP: 0010:__list_add_valid_or_report+0x11f/0x130 Call Trace: vsock_insert_connected.cold+0xe/0x13 virtio_transport_recv_pkt+0x10e9/0x1460 vsock_loopback_work+0x305/0x480 process_one_work+0xe4c/0x1560 worker_thread+0x4f1/0xd60 kthread+0x36e/0x470 ret_from_fork+0x47b/0x6b0 ret_from_fork_asm+0x1a/0x30 This fix is supplementary to commit 002541ef650b ("vsock: Ignore signal/timeout on connect() if already established"). Details under Link.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < ea36ef3c229d54b552432d1290aee1d807f67fd5 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 5f2ab77028602a22f0cc33cac063a313787cbeae (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < f89770c7365748d9d6a2ae07d1c23497ca21ec07 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < deb972c7eea8d0bc3109c35c30a1c86d4939f811 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < baf1b5715640e434249ce7f63f94bd1a00938ef9 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < c2c5359ef2c33684fa3f3652fd761a483db8d1e7 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 44d1ca05d6094a5d75c671a0545249186d790b8d (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 4f6ac74fa594a918d41255c941256e1d51592d3b (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (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\nvsock: treat TCP_CLOSING as once-established\n\nHandle the TCP_ESTABLISHED -\u003e TCP_CLOSING transition on OP_RST, which can\nrace with the connect loop. Immediately break and return 0 on\nESTABLISHED/CLOSING. The return value of connect() should reflect what\nhappened up to the point the connection was established or failed. Events\nthat occur afterwards must not affect it. E.g. even if OP_RW has already\nset sk_err, connect() should still return 0, not ENOBUFS because of it.\nAdapt the inaccurate comment above signal_pending().\n\nResetting a socket that is still present in connected_table can lead to\nmemory corruption. The reporter noted lost transports for in-flight skbs,\nand I have reproduced crashes caused by re-insertion into connected_table.\n\n  list_add double add: new=, prev=, next=.\n  kernel BUG at lib/list_debug.c:35!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  Workqueue: vsock-loopback vsock_loopback_work\n  RIP: 0010:__list_add_valid_or_report+0x11f/0x130\n  Call Trace:\n   vsock_insert_connected.cold+0xe/0x13\n   virtio_transport_recv_pkt+0x10e9/0x1460\n   vsock_loopback_work+0x305/0x480\n   process_one_work+0xe4c/0x1560\n   worker_thread+0x4f1/0xd60\n   kthread+0x36e/0x470\n   ret_from_fork+0x47b/0x6b0\n   ret_from_fork_asm+0x1a/0x30\n\nThis fix is supplementary to commit 002541ef650b (\"vsock: Ignore\nsignal/timeout on connect() if already established\"). Details under Link."
        }
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            "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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              "value": "AV:L - A local connect() on AF_VSOCK reaches the patched vsock_connect() through connect_socket() and vsock_stream_ops.connect; VMADDR_CID_LOCAL drives the response and reset through vsock_loopback_work(), not a routable network protocol.\nAC:L - The same attacker can operate both VMADDR_CID_LOCAL endpoints, deliver signals while connect() races with RESPONSE/RST processing, and retry connect() until the controlled window is hit.\nPR:L - vsock_create() and vsock_connect() impose no capability check, and vsock_auto_bind() selects an unreserved port; CAP_NET_BIND_SERVICE is checked only for an explicit port at or below LAST_RESERVED_PORT.\nUI:N - The attacker\u0027s own threads perform socket creation, connect, peer reset, signal delivery, and reconnection without any action by another user.\nS:U - The corrupted connected_table and transport state belong to the same kernel reached by the local AF_VSOCK caller; this path does not cross a guest-host, IOMMU, or other security authority boundary.\nC:H - A transport-changing reconnect reaches vsock_deassign_transport() and virtio_transport_destruct(), freeing vsk-\u003etrans while virtio_transport_consume_skb_sent() can retain and dereference it for an in-flight skb; this heap use-after-free can expose reclaimed kernel contents.\nI:H - A same-transport reconnect passes the already-linked connected_table node to vsock_insert_connected() and list_add(), while the transport-change path can modify a freed virtio_vsock_sock through bytes_unsent; these corruptions support heap grooming and control-flow hijacking.\nA:H - The demonstrated re-insertion reaches __list_add_valid_or_report() and its list_add double-add BUG, producing a kernel Oops from vsock_loopback_work(); the attacker can repeat the connection sequence."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/4f6ac74fa594a918d41255c941256e1d51592d3b"
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      "title": "vsock: treat TCP_CLOSING as once-established",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99213",
    "datePublished": "2026-10-28T10:36:06.441Z",
    "dateReserved": "2026-09-25T10:25:14.401Z",
    "dateUpdated": "2026-10-31T12:45:10.380Z",
    "state": "PUBLISHED"
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      "date": "2026-10-31",
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      "percentile": "0.06442"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-29T01:08:53.000Z",
      "cve": "CVE-2026-99213",
      "id": "msrc_CVE-2026-99213",
      "initial_release_date": "2026-10-29T01:08:53.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vsock: treat TCP_CLOSING as once-established",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99213.json",
      "version": "1"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: treat TCP_CLOSING as once-established\n\nHandle the TCP_ESTABLISHED -\u003e TCP_CLOSING transition on OP_RST, which can\nrace with the connect loop. Immediately break and return 0 on\nESTABLISHED/CLOSING. The return value of connect() should reflect what\nhappened up to the point the connection was established or failed. Events\nthat occur afterwards must not affect it. E.g. even if OP_RW has already\nset sk_err, connect() should still return 0, not ENOBUFS because of it.\nAdapt the inaccurate comment above signal_pending().\n\nResetting a socket that is still present in connected_table can lead to\nmemory corruption. The reporter noted lost transports for in-flight skbs,\nand I have reproduced crashes caused by re-insertion into connected_table.\n\n  list_add double add: new=, prev=, next=.\n  kernel BUG at lib/list_debug.c:35!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  Workqueue: vsock-loopback vsock_loopback_work\n  RIP: 0010:__list_add_valid_or_report+0x11f/0x130\n  Call Trace:\n   vsock_insert_connected.cold+0xe/0x13\n   virtio_transport_recv_pkt+0x10e9/0x1460\n   vsock_loopback_work+0x305/0x480\n   process_one_work+0xe4c/0x1560\n   worker_thread+0x4f1/0xd60\n   kthread+0x36e/0x470\n   ret_from_fork+0x47b/0x6b0\n   ret_from_fork_asm+0x1a/0x30\n\nThis fix is supplementary to commit 002541ef650b (\"vsock: Ignore\nsignal/timeout on connect() if already established\"). Details under Link."
          }
        ],
        "id": "CVE-2026-99213",
        "lastModified": "2026-10-31T13:17:59.610",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-28T11:17:42.770",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/44d1ca05d6094a5d75c671a0545249186d790b8d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4f6ac74fa594a918d41255c941256e1d51592d3b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5f2ab77028602a22f0cc33cac063a313787cbeae"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/baf1b5715640e434249ce7f63f94bd1a00938ef9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c2c5359ef2c33684fa3f3652fd761a483db8d1e7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/deb972c7eea8d0bc3109c35c30a1c86d4939f811"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ea36ef3c229d54b552432d1290aee1d807f67fd5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f89770c7365748d9d6a2ae07d1c23497ca21ec07"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T07:18:37+00:00",
      "cve": "CVE-2026-99213",
      "id": "CVE-2026-99213",
      "initial_release_date": "2026-10-28T00:00:00+00:00",
      "product_status:known_affected": "264",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock: treat TCP_CLOSING as once-established",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99213.json",
      "version": "3"
    }
  }
}



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