{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()",
    "id" : "2451255",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451255"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-825",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nwifi: cfg80211: cancel rfkill_block work in wiphy_unregister()\nThere is a use-after-free error in cfg80211_shutdown_all_interfaces found\nby syzkaller:\nBUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220\nRead of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326\nCPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nWorkqueue: events cfg80211_rfkill_block_work\nCall Trace:\n<TASK>\ndump_stack_lvl+0x116/0x1f0\nprint_report+0xcd/0x630\nkasan_report+0xe0/0x110\ncfg80211_shutdown_all_interfaces+0x213/0x220\ncfg80211_rfkill_block_work+0x1e/0x30\nprocess_one_work+0x9cf/0x1b70\nworker_thread+0x6c8/0xf10\nkthread+0x3c5/0x780\nret_from_fork+0x56d/0x700\nret_from_fork_asm+0x1a/0x30\n</TASK>\nThe problem arises due to the rfkill_block work is not cancelled when wiphy\nis being unregistered. In order to fix the issue cancel the corresponding\nwork in wiphy_unregister().\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.", "A flaw was found in the Linux kernel's cfg80211 component. This use-after-free vulnerability occurs when the rfkill_block work is not properly cancelled during the unregistration of a wireless device. A local attacker could potentially exploit this flaw, leading to a denial of service due to memory corruption." ],
  "statement" : "This flaw affects systems with wireless networking. The rfkill_block work can execute after wiphy_unregister() completes, accessing freed memory in cfg80211_shutdown_all_interfaces(). The race requires specific timing between wireless device unregistration and rfkill work execution. Found by syzkaller automated testing.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "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" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23336\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23336\nhttps://lore.kernel.org/linux-cve-announce/2026032533-CVE-2026-23336-d365@gregkh/T" ],
  "name" : "CVE-2026-23336",
  "csaw" : false
}