CVE-2026-64115 (GCVE-0-2026-64115)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-10-19 20:28
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; That made vmci_transport_recv_listen() skip vsock_remove_pending(), leaving the pending socket on the listener's pending_links with sk_state = TCP_CLOSE while destroy: still dropped the explicit reference taken before schedule_delayed_work(). One second later vsock_pending_work() observed is_pending=true and performed full cleanup: vsock_remove_pending() then the two trailing sock_put(sk) calls -- the first reached refcount 0 and __sk_freed the socket, and the second wrote into the freed object: BUG: KASAN: slab-use-after-free in refcount_warn_saturate Write of size 4 at addr ffff88800b1cac80 by task kworker Workqueue: events vsock_pending_work Treat peer RST like any other unexpected packet type (err = -EINVAL). All destroy: arms now return err < 0, so vmci_transport_recv_listen() removes pending from pending_links synchronously and vsock_pending_work() takes the is_pending=false / !rejected branch, dropping only its own work reference. This also closes the multi-packet race Sashiko reported on v2: pending is removed from the list before any subsequent packet can find it. The pre-existing sk_acceptq_removed() gap on the err < 0 path of vmci_transport_recv_listen() that Sashiko also noted is not introduced or changed by this patch. Tested on lts-6.12.79 with KASAN: 52/100 unpatched -> 0/100 patched.
References
Impacted products
Vendor Product Version
Linux Linux Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
Version: d021c344051af91f42c5ba9fdedc176740cbd238
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    "datePublished": "2026-07-19T15:40:15.513Z",
    "dateReserved": "2026-07-19T07:54:57.035Z",
    "dateUpdated": "2026-10-19T20:28:12.821Z",
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\"https://git.kernel.org/stable/c/9fe74e42914c851d68069713b7b917a9c33faf26\"}, {\"url\": \"https://git.kernel.org/stable/c/99e22ddf4edb63dc8382bc028af928056d3450cf\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvsock/vmci: fix UAF when peer resets connection during handshake\\n\\nvmci_transport_recv_connecting_server() returned err = 0 for a peer\\nRST in its default switch arm:\\n\\n\\terr = pkt-\u003etype == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL;\\n\\nThat made vmci_transport_recv_listen() skip vsock_remove_pending(),\\nleaving the pending socket on the listener\u0027s pending_links with\\nsk_state = TCP_CLOSE while destroy: still dropped the explicit\\nreference taken before schedule_delayed_work().\\n\\nOne second later vsock_pending_work() observed is_pending=true and\\nperformed full cleanup: vsock_remove_pending() then the two trailing\\nsock_put(sk) calls -- the first reached refcount 0 and __sk_freed\\nthe socket, and the second wrote into the freed object:\\n\\n  BUG: KASAN: slab-use-after-free in refcount_warn_saturate\\n  Write of size 4 at addr ffff88800b1cac80 by task kworker\\n  Workqueue: events vsock_pending_work\\n\\nTreat peer RST like any other unexpected packet type (err = -EINVAL).\\nAll destroy: arms now return err \u003c 0, so vmci_transport_recv_listen()\\nremoves pending from pending_links synchronously and\\nvsock_pending_work() takes the is_pending=false / !rejected branch,\\ndropping only its own work reference.  This also closes the\\nmulti-packet race Sashiko reported on v2: pending is removed from\\nthe list before any subsequent packet can find it.\\n\\nThe pre-existing sk_acceptq_removed() gap on the err \u003c 0 path of\\nvmci_transport_recv_listen() that Sashiko also noted is not\\nintroduced or changed by this patch.\\n\\nTested on lts-6.12.79 with KASAN: 52/100 unpatched -\u003e 0/100 patched.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.142\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.92\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.34\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.11\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"3.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:39:24.360Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64115\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T15:42:23.154Z\", \"dateReserved\": \"2026-07-19T07:54:57.035Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T15:40:15.513Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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