CVE-2026-98947 (GCVE-0-2026-98947)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-23 12:19
VLAI
Title
vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock: Fix memory leak in vmci_transport_recv_dgram_cb() During the closure of a datagram socket, the vmci_transport_recv_dgram_cb() function may be called, which will add the packets to the socket's backlog; then, after the receive queue is cleared, the __release_sock() function will move the packet back from the socket's backlog to the receive queue, which will lead to a memory leak. sock_close __sock_release __vsock_release // take ownership by user-space lock_sock_nested sock_set_flag(sk, SOCK_DEAD) vmci_transport_release vmci_dispatch_dgs vmci_datagram_invoke_guest_handler vmci_transport_recv_dgram_cb sk_receive_skb if (!sock_owned_by_user(sk)) [...] (!) else if sk_add_backlog() [...] (!) skb_queue_purge(&sk->sk_receive_queue) release_sock __release_sock // move all packets from the backlog // to the receive queue (!) sk_backlog_rcv vsock_queue_rcv_skb [...] __sock_queue_rcv_skb if (!sock_flag(sk, SOCK_DEAD)) // Since the socket is "dead", the function will not // be called sk->sk_data_ready(sk) sock_release_ownership(sk); sock_put Add a receive queue cleanup in the socket destructor to fix this. syzkaller report: unreferenced object 0xffff8880117bfb80 (size 240): comm "irq/56-vmw_vmci", pid 205, jiffies 4295064448 (age 73.992s) hex dump (first 32 bytes): 78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff x.&.....x.&..... 00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff ..........&..... backtrace: [<ffffffff82be8d97>] __alloc_skb+0x287/0x330 net/core/skbuff.c:505 [<ffffffffa114bcbd>] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport] [<ffffffffa05072c6>] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci] [<ffffffffa050ad75>] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci] [<ffffffffa050b025>] vmci_interrupt+0x55/0x290 [vmw_vmci] [<ffffffff8137ad2b>] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205 [<ffffffff8137c7ae>] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314 [<ffffffff81253dd6>] kthread+0x2e6/0x3a0 kernel/kthread.c:376 [<ffffffff81004392>] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 0f8e2b2045355a0ee2008125e573435504b13cee (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 4835dbcde5cc3ae37e0d0796052056b35fcae8bf (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 9907db2b8e7ba70b442bb9dec86526a6511fac62 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 7c24a4e87e219072e5e106f6791146cbf3b056b3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/af_vsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Fix memory leak in vmci_transport_recv_dgram_cb()\n\nDuring the closure of a datagram socket, the vmci_transport_recv_dgram_cb()\nfunction may be called, which will add the packets\nto the socket\u0027s backlog; then, after the receive queue is cleared,\nthe __release_sock() function will move the packet back from the socket\u0027s\nbacklog to the receive queue, which will lead to a memory leak.\n\nsock_close\n  __sock_release\n    __vsock_release\n      // take ownership by user-space\n      lock_sock_nested\n      sock_set_flag(sk, SOCK_DEAD)\n      vmci_transport_release\n                                      vmci_dispatch_dgs\n                                        vmci_datagram_invoke_guest_handler\n                                          vmci_transport_recv_dgram_cb\n                                            sk_receive_skb\n                                              if (!sock_owned_by_user(sk))\n                                                  [...]\n                                         (!)  else if sk_add_backlog()\n                                                  [...]\n  (!) skb_queue_purge(\u0026sk-\u003esk_receive_queue)\n\n      release_sock\n        __release_sock\n          // move all packets from the backlog\n          // to the receive queue\n   (!)    sk_backlog_rcv\n            vsock_queue_rcv_skb\n            [...]\n              __sock_queue_rcv_skb\n                if (!sock_flag(sk, SOCK_DEAD))\n                  // Since the socket is \"dead\", the function will not\n                  // be called\n                  sk-\u003esk_data_ready(sk)\n        sock_release_ownership(sk);\n        sock_put\n\nAdd a receive queue cleanup in the socket destructor to fix this.\n\nsyzkaller report:\n\nunreferenced object 0xffff8880117bfb80 (size 240):\n  comm \"irq/56-vmw_vmci\", pid 205, jiffies 4295064448 (age 73.992s)\n  hex dump (first 32 bytes):\n    78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff  x.\u0026.....x.\u0026.....\n    00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff  ..........\u0026.....\n  backtrace:\n    [\u003cffffffff82be8d97\u003e] __alloc_skb+0x287/0x330 net/core/skbuff.c:505\n    [\u003cffffffffa114bcbd\u003e] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport]\n    [\u003cffffffffa05072c6\u003e] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci]\n    [\u003cffffffffa050ad75\u003e] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci]\n    [\u003cffffffffa050b025\u003e] vmci_interrupt+0x55/0x290 [vmw_vmci]\n    [\u003cffffffff8137ad2b\u003e] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205\n    [\u003cffffffff8137c7ae\u003e] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314\n    [\u003cffffffff81253dd6\u003e] kthread+0x2e6/0x3a0 kernel/kthread.c:376\n    [\u003cffffffff81004392\u003e] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with Syzkaller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:19:06.146Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee"
        },
        {
          "url": "https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3"
        }
      ],
      "title": "vsock: Fix memory leak in vmci_transport_recv_dgram_cb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98947",
    "datePublished": "2026-10-23T12:19:06.146Z",
    "dateReserved": "2026-09-25T10:25:14.381Z",
    "dateUpdated": "2026-10-23T12:19:06.146Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98947",
      "date": "2026-10-26",
      "epss": "0.00168",
      "percentile": "0.06157"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-25T01:02:02.000Z",
      "cve": "CVE-2026-98947",
      "id": "msrc_CVE-2026-98947",
      "initial_release_date": "2026-10-24T01:09:14.000Z",
      "product_status:under_investigation": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vsock: Fix memory leak in vmci_transport_recv_dgram_cb()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98947.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/vmw_vsock/af_vsock.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
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                    "versionType": "git"
                  }
                ]
              },
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                "product": "Linux",
                "programFiles": [
                  "net/vmw_vsock/af_vsock.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "3.9"
                  },
                  {
                    "lessThan": "3.9",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.113",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.57",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.11",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Fix memory leak in vmci_transport_recv_dgram_cb()\n\nDuring the closure of a datagram socket, the vmci_transport_recv_dgram_cb()\nfunction may be called, which will add the packets\nto the socket\u0027s backlog; then, after the receive queue is cleared,\nthe __release_sock() function will move the packet back from the socket\u0027s\nbacklog to the receive queue, which will lead to a memory leak.\n\nsock_close\n  __sock_release\n    __vsock_release\n      // take ownership by user-space\n      lock_sock_nested\n      sock_set_flag(sk, SOCK_DEAD)\n      vmci_transport_release\n                                      vmci_dispatch_dgs\n                                        vmci_datagram_invoke_guest_handler\n                                          vmci_transport_recv_dgram_cb\n                                            sk_receive_skb\n                                              if (!sock_owned_by_user(sk))\n                                                  [...]\n                                         (!)  else if sk_add_backlog()\n                                                  [...]\n  (!) skb_queue_purge(\u0026sk-\u003esk_receive_queue)\n\n      release_sock\n        __release_sock\n          // move all packets from the backlog\n          // to the receive queue\n   (!)    sk_backlog_rcv\n            vsock_queue_rcv_skb\n            [...]\n              __sock_queue_rcv_skb\n                if (!sock_flag(sk, SOCK_DEAD))\n                  // Since the socket is \"dead\", the function will not\n                  // be called\n                  sk-\u003esk_data_ready(sk)\n        sock_release_ownership(sk);\n        sock_put\n\nAdd a receive queue cleanup in the socket destructor to fix this.\n\nsyzkaller report:\n\nunreferenced object 0xffff8880117bfb80 (size 240):\n  comm \"irq/56-vmw_vmci\", pid 205, jiffies 4295064448 (age 73.992s)\n  hex dump (first 32 bytes):\n    78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff  x.\u0026.....x.\u0026.....\n    00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff  ..........\u0026.....\n  backtrace:\n    [\u003cffffffff82be8d97\u003e] __alloc_skb+0x287/0x330 net/core/skbuff.c:505\n    [\u003cffffffffa114bcbd\u003e] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport]\n    [\u003cffffffffa05072c6\u003e] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci]\n    [\u003cffffffffa050ad75\u003e] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci]\n    [\u003cffffffffa050b025\u003e] vmci_interrupt+0x55/0x290 [vmw_vmci]\n    [\u003cffffffff8137ad2b\u003e] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205\n    [\u003cffffffff8137c7ae\u003e] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314\n    [\u003cffffffff81253dd6\u003e] kthread+0x2e6/0x3a0 kernel/kthread.c:376\n    [\u003cffffffff81004392\u003e] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with Syzkaller."
          }
        ],
        "id": "CVE-2026-98947",
        "lastModified": "2026-10-23T13:17:15.760",
        "metrics": {},
        "published": "2026-10-23T13:17:15.760",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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