{
  "threat_severity" : "Important",
  "public_date" : "2025-12-04T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel: vsock vulnerability may lead to memory corruption",
    "id" : "2418872",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2418872"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-364",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nvsock: Ignore signal/timeout on connect() if already established\nDuring connect(), acting on a signal/timeout by disconnecting an already\nestablished socket leads to several issues:\n1. connect() invoking vsock_transport_cancel_pkt() ->\nvirtio_transport_purge_skbs() may race with sendmsg() invoking\nvirtio_transport_get_credit(). This results in a permanently elevated\n`vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\n2. connect() resetting a connected socket's state may race with socket\nbeing placed in a sockmap. A disconnected socket remaining in a sockmap\nbreaks sockmap's assumptions. And gives rise to WARNs.\n3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a\ntransport change/drop after TCP_ESTABLISHED. Which poses a problem for\nany simultaneous sendmsg() or connect() and may result in a\nuse-after-free/null-ptr-deref.\nDo not disconnect socket on signal/timeout. Keep the logic for unconnected\nsockets: they don't linger, can't be placed in a sockmap, are rejected by\nsendmsg().\n[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/\n[2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/\n[3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/", "A flaw was found in the Linux kernel's `vsock` component. This vulnerability occurs when a `connect()` operation on an already established socket is interrupted by a signal or timeout, causing the system to mishandle the socket's state. This incorrect handling can lead to a race condition, potentially resulting in memory corruption, such as a use-after-free or null-pointer dereference. A local attacker could exploit this to cause a denial of service or potentially escalate privileges." ],
  "statement" : "This vulnerability is rated Important for Red Hat Enterprise Linux 7, 8, 9, and 10. A flaw in the Linux kernel's `vsock` component allows a local attacker to cause memory corruption, potentially leading to a denial of service or privilege escalation. This occurs when a `connect()` operation on an established socket is interrupted by a signal or timeout, leading to an incorrect handling of the socket's state.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1690",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "kernel-0:6.12.0-124.31.1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1727",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "kernel-0:6.12.0-55.58.1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1623",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt_els:7",
    "package" : "kernel-rt-0:3.10.0-1160.146.1.rt56.1298.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-01-29T00:00:00Z",
    "advisory" : "RHSA-2026:1581",
    "cpe" : "cpe:/o:redhat:rhel_els:7",
    "package" : "kernel-0:3.10.0-1160.146.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-01-26T00:00:00Z",
    "advisory" : "RHSA-2026:1148",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.97.1.rt7.438.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-01-26T00:00:00Z",
    "advisory" : "RHSA-2026:1142",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.97.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3848",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1512",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.2",
    "package" : "kernel-0:4.18.0-193.183.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-02-04T00:00:00Z",
    "advisory" : "RHSA-2026:1886",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.184.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-02-04T00:00:00Z",
    "advisory" : "RHSA-2026:1886",
    "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.4",
    "package" : "kernel-0:4.18.0-305.184.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1442",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.6",
    "package" : "kernel-0:4.18.0-372.177.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1442",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.6",
    "package" : "kernel-0:4.18.0-372.177.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1442",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.6",
    "package" : "kernel-0:4.18.0-372.177.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3866",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.6",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1445",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.8",
    "package" : "kernel-0:4.18.0-477.126.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1445",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "kernel-0:4.18.0-477.126.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3865",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-01-26T00:00:00Z",
    "advisory" : "RHSA-2026:1143",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.26.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-01-26T00:00:00Z",
    "advisory" : "RHSA-2026:1143",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.26.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:3987",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1494",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "kernel-0:5.14.0-70.163.1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-01-28T00:00:00Z",
    "advisory" : "RHSA-2026:1495",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0::nfv",
    "package" : "kernel-rt-0:5.14.0-70.163.1.rt21.235.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3873",
    "cpe" : "cpe:/o:redhat:rhel_e4s:9.0",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-02-04T00:00:00Z",
    "advisory" : "RHSA-2026:1909",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "kernel-0:5.14.0-284.155.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-02-04T00:00:00Z",
    "advisory" : "RHSA-2026:1946",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2::nfv",
    "package" : "kernel-rt-0:5.14.0-284.155.1.rt14.440.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3886",
    "cpe" : "cpe:/o:redhat:rhel_e4s:9.2",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-02-04T00:00:00Z",
    "advisory" : "RHSA-2026:1879",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.109.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3867",
    "cpe" : "cpe:/o:redhat:rhel_eus:9.4",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1703",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "kernel-0:5.14.0-570.84.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-03-05T00:00:00Z",
    "advisory" : "RHSA-2026:3868",
    "cpe" : "cpe:/o:redhat:rhel_eus:9.6",
    "package" : "kpatch-patch"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-40248\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40248\nhttps://lore.kernel.org/linux-cve-announce/2025120430-CVE-2025-40248-506e@gregkh/T" ],
  "name" : "CVE-2025-40248",
  "csaw" : false
}