{
  "threat_severity" : "Important",
  "public_date" : "2026-05-21T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: rtmutex: Use waiter::task instead of current in remove_waiter()",
    "id" : "2480453",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2480453"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-825",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nrtmutex: Use waiter::task instead of current in remove_waiter()\nremove_waiter() is used by the slowlock paths, but it is also used for\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\nfutex_requeue().\nIn the latter case waiter::task is not current, but remove_waiter()\noperates on current for the dequeue operation. That results in several\nproblems:\n1) the rbtree dequeue happens without waiter::task::pi_lock being held\n2) the waiter task's pi_blocked_on state is not cleared, which leaves a\ndangling pointer primed for UAF around.\n3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\ntask\nUse waiter::task instead of current in all related operations in\nremove_waiter() to cure those problems.\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\nchangelog ]", "A flaw was found in the Linux kernel. When the kernel's real-time mutex (rtmutex) component performs a specific operation called 'proxy-lock rollback' during futex requeue, it incorrectly handles task pointers. This can lead to a 'Use-After-Free' (UAF) vulnerability, where the system attempts to use memory that has already been released. A local attacker could potentially exploit this to gain elevated privileges or execute unauthorized code." ],
  "affected_release" : [ {
    "product_name" : "NVIDIA for RHEL 10",
    "release_date" : "2026-07-10T00:00:00Z",
    "advisory" : "RHSA-2026:37728",
    "cpe" : "cpe:/a:redhat:enterprise_linux_nvidia:10::el10",
    "package" : "kernel-0:6.12.0-231.16.el10nv"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-07-13T00:00:00Z",
    "advisory" : "RHSA-2026:38492",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kernel-0:6.12.0-211.33.1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-07-14T00:00:00Z",
    "advisory" : "RHSA-2026:39082",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-07-14T00:00:00Z",
    "advisory" : "RHSA-2026:39083",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.143.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:39984",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.198.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:39984",
    "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.4",
    "package" : "kernel-0:4.18.0-305.198.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:40068",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.6",
    "package" : "kernel-0:4.18.0-372.201.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:40068",
    "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.6",
    "package" : "kernel-0:4.18.0-372.201.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-07-16T00:00:00Z",
    "advisory" : "RHSA-2026:40760",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.8",
    "package" : "kernel-0:4.18.0-477.152.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-07-16T00:00:00Z",
    "advisory" : "RHSA-2026:40760",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "kernel-0:4.18.0-477.152.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-07-13T00:00:00Z",
    "advisory" : "RHSA-2026:38491",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.25.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-07-13T00:00:00Z",
    "advisory" : "RHSA-2026:38491",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.25.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:40082",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "kernel-0:5.14.0-284.181.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:39983",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2::nfv",
    "package" : "kernel-rt-0:5.14.0-284.181.1.rt14.466.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "release_date" : "2026-07-16T00:00:00Z",
    "advisory" : "RHSA-2026:41063",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.4",
    "package" : "kernel-0:5.14.0-427.138.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-07-16T00:00:00Z",
    "advisory" : "RHSA-2026:40425",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "kernel-0:5.14.0-570.128.1.el9_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Affected",
    "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 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-43499\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43499\nhttps://lore.kernel.org/linux-cve-announce/2026052158-CVE-2026-43499-1294@gregkh/T" ],
  "csaw" : true,
  "name" : "CVE-2026-43499",
  "mitigation" : {
    "value" : "See the security bulletin for a detailed mitigation procedure.",
    "lang" : "en:us"
  }
}