CVE-2023-53490 (GCVE-0-2023-53490)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2025-10-01 11:45
VLAI?
Title
mptcp: fix disconnect vs accept race
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix disconnect vs accept race Despite commit 0ad529d9fd2b ("mptcp: fix possible divide by zero in recvmsg()"), the mptcp protocol is still prone to a race between disconnect() (or shutdown) and accept. The root cause is that the mentioned commit checks the msk-level flag, but mptcp_stream_accept() does acquire the msk-level lock, as it can rely directly on the first subflow lock. As reported by Christoph than can lead to a race where an msk socket is accepted after that mptcp_subflow_queue_clean() releases the listener socket lock and just before it takes destructive actions leading to the following splat: BUG: kernel NULL pointer dereference, address: 0000000000000012 PGD 5a4ca067 P4D 5a4ca067 PUD 37d4c067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 2 PID: 10955 Comm: syz-executor.5 Not tainted 6.5.0-rc1-gdc7b257ee5dd #37 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014 RIP: 0010:mptcp_stream_accept+0x1ee/0x2f0 include/net/inet_sock.h:330 Code: 0a 09 00 48 8b 1b 4c 39 e3 74 07 e8 bc 7c 7f fe eb a1 e8 b5 7c 7f fe 4c 8b 6c 24 08 eb 05 e8 a9 7c 7f fe 49 8b 85 d8 09 00 00 <0f> b6 40 12 88 44 24 07 0f b6 6c 24 07 bf 07 00 00 00 89 ee e8 89 RSP: 0018:ffffc90000d07dc0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888037e8d020 RCX: ffff88803b093300 RDX: 0000000000000000 RSI: ffffffff833822c5 RDI: ffffffff8333896a RBP: 0000607f82031520 R08: ffff88803b093300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000003e83 R12: ffff888037e8d020 R13: ffff888037e8c680 R14: ffff888009af7900 R15: ffff888009af6880 FS: 00007fc26d708640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000012 CR3: 0000000066bc5001 CR4: 0000000000370ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_accept+0x1ae/0x260 net/socket.c:1872 __sys_accept4+0x9b/0x110 net/socket.c:1913 __do_sys_accept4 net/socket.c:1954 [inline] __se_sys_accept4 net/socket.c:1951 [inline] __x64_sys_accept4+0x20/0x30 net/socket.c:1951 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x47/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Address the issue by temporary removing the pending request socket from the accept queue, so that racing accept() can't touch them. After depleting the msk - the ssk still exists, as plain TCP sockets, re-insert them into the accept queue, so that later inet_csk_listen_stop() will complete the tcp socket disposal.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b45d8f5375eda3ddc89fe529b58bb643917bd87b , < ded9f5551ce5cafa3c41c794428c27a0d0a00542 (git)
Affected: 2a6a870e44dd88f1a6a2893c65ef756a9edfb4c7 , < b2b4c84eb7149f34c0f25f17042d095ba5357d68 (git)
Affected: 2a6a870e44dd88f1a6a2893c65ef756a9edfb4c7 , < 511b90e39250135a7f900f1c3afbce25543018a2 (git)
Affected: 64b66601308dae6105fbde964a339462a29c2a73 (git)
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    Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.1.46 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/protocol.h",
            "net/mptcp/subflow.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ded9f5551ce5cafa3c41c794428c27a0d0a00542",
              "status": "affected",
              "version": "b45d8f5375eda3ddc89fe529b58bb643917bd87b",
              "versionType": "git"
            },
            {
              "lessThan": "b2b4c84eb7149f34c0f25f17042d095ba5357d68",
              "status": "affected",
              "version": "2a6a870e44dd88f1a6a2893c65ef756a9edfb4c7",
              "versionType": "git"
            },
            {
              "lessThan": "511b90e39250135a7f900f1c3afbce25543018a2",
              "status": "affected",
              "version": "2a6a870e44dd88f1a6a2893c65ef756a9edfb4c7",
              "versionType": "git"
            },
            {
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              "version": "64b66601308dae6105fbde964a339462a29c2a73",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/protocol.h",
            "net/mptcp/subflow.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.46",
                  "versionStartIncluding": "6.1.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.11",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.2.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix disconnect vs accept race\n\nDespite commit 0ad529d9fd2b (\"mptcp: fix possible divide by zero in\nrecvmsg()\"), the mptcp protocol is still prone to a race between\ndisconnect() (or shutdown) and accept.\n\nThe root cause is that the mentioned commit checks the msk-level\nflag, but mptcp_stream_accept() does acquire the msk-level lock,\nas it can rely directly on the first subflow lock.\n\nAs reported by Christoph than can lead to a race where an msk\nsocket is accepted after that mptcp_subflow_queue_clean() releases\nthe listener socket lock and just before it takes destructive\nactions leading to the following splat:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000012\nPGD 5a4ca067 P4D 5a4ca067 PUD 37d4c067 PMD 0\nOops: 0000 [#1] PREEMPT SMP\nCPU: 2 PID: 10955 Comm: syz-executor.5 Not tainted 6.5.0-rc1-gdc7b257ee5dd #37\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\nRIP: 0010:mptcp_stream_accept+0x1ee/0x2f0 include/net/inet_sock.h:330\nCode: 0a 09 00 48 8b 1b 4c 39 e3 74 07 e8 bc 7c 7f fe eb a1 e8 b5 7c 7f fe 4c 8b 6c 24 08 eb 05 e8 a9 7c 7f fe 49 8b 85 d8 09 00 00 \u003c0f\u003e b6 40 12 88 44 24 07 0f b6 6c 24 07 bf 07 00 00 00 89 ee e8 89\nRSP: 0018:ffffc90000d07dc0 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: ffff888037e8d020 RCX: ffff88803b093300\nRDX: 0000000000000000 RSI: ffffffff833822c5 RDI: ffffffff8333896a\nRBP: 0000607f82031520 R08: ffff88803b093300 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000003e83 R12: ffff888037e8d020\nR13: ffff888037e8c680 R14: ffff888009af7900 R15: ffff888009af6880\nFS:  00007fc26d708640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000012 CR3: 0000000066bc5001 CR4: 0000000000370ee0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n do_accept+0x1ae/0x260 net/socket.c:1872\n __sys_accept4+0x9b/0x110 net/socket.c:1913\n __do_sys_accept4 net/socket.c:1954 [inline]\n __se_sys_accept4 net/socket.c:1951 [inline]\n __x64_sys_accept4+0x20/0x30 net/socket.c:1951\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x47/0xa0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nAddress the issue by temporary removing the pending request socket\nfrom the accept queue, so that racing accept() can\u0027t touch them.\n\nAfter depleting the msk - the ssk still exists, as plain TCP sockets,\nre-insert them into the accept queue, so that later inet_csk_listen_stop()\nwill complete the tcp socket disposal."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:45:42.182Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ded9f5551ce5cafa3c41c794428c27a0d0a00542"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2b4c84eb7149f34c0f25f17042d095ba5357d68"
        },
        {
          "url": "https://git.kernel.org/stable/c/511b90e39250135a7f900f1c3afbce25543018a2"
        }
      ],
      "title": "mptcp: fix disconnect vs accept race",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53490",
    "datePublished": "2025-10-01T11:45:42.182Z",
    "dateReserved": "2025-10-01T11:39:39.403Z",
    "dateUpdated": "2025-10-01T11:45:42.182Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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