{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-23T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: can: raw: fix ro->uniq use-after-free in raw_rcv()",
    "id" : "2461107",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2461107"
  },
  "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-366",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ncan: raw: fix ro->uniq use-after-free in raw_rcv()\nraw_release() unregisters raw CAN receive filters via can_rx_unregister(),\nbut receiver deletion is deferred with call_rcu(). This leaves a window\nwhere raw_rcv() may still be running in an RCU read-side critical section\nafter raw_release() frees ro->uniq, leading to a use-after-free of the\npercpu uniq storage.\nMove free_percpu(ro->uniq) out of raw_release() and into a raw-specific\nsocket destructor. can_rx_unregister() takes an extra reference to the\nsocket and only drops it from the RCU callback, so freeing uniq from\nsk_destruct ensures the percpu area is not released until the relevant\ncallbacks have drained.\n[mkl: applied manually]", "A flaw was found in the Linux kernel's Controller Area Network (CAN) raw socket implementation. A use-after-free vulnerability can occur due to a timing window during the unregistration of CAN receive filters, allowing a freed memory region to be accessed. This could lead to system instability or a denial of service (DoS)." ],
  "statement" : "A use-after-free flaw in the Linux kernel CAN raw socket implementation can occur when raw_release() frees the per-CPU ro->uniq storage before RCU-deferred receive callbacks have fully drained. A local attacker able to create raw CAN sockets and trigger CAN receive activity could race socket teardown with raw_rcv() and cause a kernel crash. The likely impact is denial of service, while privilege escalation would require additional, unproven control over per-CPU memory reuse.\nThe issue appears more consistent with an RCU lifetime/race-condition bug leading primarily to denial of service, as exploitation depends on a narrow teardown race involving a percpu object rather than a generic reclaimable slab object, with no demonstrated privilege-escalation path or obvious controlled overwrite primitive in the relatively niche CAN raw socket subsystem.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-05-11T00:00:00Z",
    "advisory" : "RHSA-2026:15883",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "kernel-0:6.12.0-55.72.1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-05-21T00:00:00Z",
    "advisory" : "RHSA-2026:20130",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.192.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-05-21T00:00:00Z",
    "advisory" : "RHSA-2026:20130",
    "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.4",
    "package" : "kernel-0:4.18.0-305.192.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19521",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.8",
    "package" : "kernel-0:4.18.0-477.143.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19521",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "kernel-0:4.18.0-477.143.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19568",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.10.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19568",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.10.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19705",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "kernel-0:5.14.0-70.180.1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19711",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0::nfv",
    "package" : "kernel-rt-0:5.14.0-70.180.1.rt21.252.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20593",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "kernel-0:5.14.0-284.172.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19875",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2::nfv",
    "package" : "kernel-rt-0:5.14.0-284.172.1.rt14.457.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-05-06T00:00:00Z",
    "advisory" : "RHSA-2026:13932",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.124.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-05-06T00:00:00Z",
    "advisory" : "RHSA-2026:14339",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "kernel-0:5.14.0-570.112.1.el9_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Under investigation",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "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-2026-31532\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31532\nhttps://lore.kernel.org/linux-cve-announce/2026042349-CVE-2026-31532-a820@gregkh/T" ],
  "name" : "CVE-2026-31532",
  "csaw" : false
}