{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-10T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel: Denial of service due to a race condition in the TLS subsystem",
    "id" : "2446139",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2446139"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-366",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ntls: Fix race condition in tls_sw_cancel_work_tx()\nThis issue was discovered during a code audit.\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\ntx_work_handler() can still be scheduled from paths such as the\nDelayed ACK handler or ksoftirqd.\nAs a result, the tx_work_handler() worker may dereference a freed\nTLS object.\nThe following is a simple race scenario:\ncpu0                         cpu1\ntls_sk_proto_close()\ntls_sw_cancel_work_tx()\ntls_write_space()\ntls_sw_write_space()\nif (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))\nset_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);\ncancel_delayed_work_sync(&ctx->tx_work.work);\nschedule_delayed_work(&tx_ctx->tx_work.work, 0);\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync().", "A flaw was found in the Linux kernel. A local user could exploit a race condition in the TLS (Transport Layer Security) subsystem's `tls_sw_cancel_work_tx()` function. This race condition may allow the system to dereference a freed TLS object, potentially leading to a denial of service." ],
  "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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23240\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23240\nhttps://lore.kernel.org/linux-cve-announce/2026031034-CVE-2026-23240-2531@gregkh/T" ],
  "name" : "CVE-2026-23240",
  "csaw" : false
}