CVE-2026-64115 (GCVE-0-2026-64115)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
vsock/vmci: fix UAF when peer resets connection during handshake
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.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 1e19f08552b90070ed18bafb1763c78297823af6 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 1dd531e28f61edd286edc486ab068f135b5ae1eb (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < ecda37f8faab3220da199335e42564cb7a9ad145 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 440447699c681e26ed58e9c309cad718270a18b4 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 9fe74e42914c851d68069713b7b917a9c33faf26 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 99e22ddf4edb63dc8382bc028af928056d3450cf (git)
Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "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."
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            "version": "3.1"
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          "url": "https://git.kernel.org/stable/c/99e22ddf4edb63dc8382bc028af928056d3450cf"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/vmw_vsock/vmci_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"1e19f08552b90070ed18bafb1763c78297823af6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"1dd531e28f61edd286edc486ab068f135b5ae1eb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"ecda37f8faab3220da199335e42564cb7a9ad145\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"440447699c681e26ed58e9c309cad718270a18b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"9fe74e42914c851d68069713b7b917a9c33faf26\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d021c344051af91f42c5ba9fdedc176740cbd238\",\"lessThan\":\"99e22ddf4edb63dc8382bc028af928056d3450cf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/vmw_vsock/vmci_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1dd531e28f61edd286edc486ab068f135b5ae1eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e19f08552b90070ed18bafb1763c78297823af6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/440447699c681e26ed58e9c309cad718270a18b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99e22ddf4edb63dc8382bc028af928056d3450cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9fe74e42914c851d68069713b7b917a9c33faf26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecda37f8faab3220da199335e42564cb7a9ad145\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T16:47:12+00:00",
      "cve": "CVE-2026-64115",
      "id": "CVE-2026-64115",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock/vmci: fix UAF when peer resets connection during handshake",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64115.json",
      "version": "3"
    }
  }
}



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