{
  "cveId": "CVE-2026-43249",
  "url": "https://patchblox.com/security/cve/CVE-2026-43249",
  "summary": "CVE-2026-43249 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43249, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "9p/xen: protect xen_9pfs_front_free against concurrent calls",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  9p/xen: protect xen_9pfs_front_free against concurrent calls  The xenwatch thread can race with other back-end change notifications and call xen_9pfs_front_free() twice, hitting the observed general protection fault due to a double-free. Guard the teardown path so only one caller can release the front-end state at a time, preventing the crash.  This is a fix for the following double-free:  [   27.052347] Oops: general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b6b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [   27.052357] CPU: 0 UID: 0 PID: 32 Comm: xenwatch Not tainted 6.18.0-02087-g51ab33fc0a8b-dirty #60 PREEMPT(none) [   27.052363] RIP: e030:xen_9pfs_front_free\u002B0x1d/0x150 [   27.052368] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 48 89 fd 48 c7 c7 48 d0 92 85 53 e8 cb cb 05 00 48 8b 45 08 48 8b 55 00 \u003C48\u003E 3b 28 0f 85 f9 28 35 fe 48 3b 6a 08 0f 85 ef 28 35 fe 48 89 42 [   27.052377] RSP: e02b:ffffc9004016fdd0 EFLAGS: 00010246 [   27.052381] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88800d66e400 RCX: 0000000000000000 [   27.052385] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000000 RDI: 0000000000000000 [   27.052389] RBP: ffff88800a887040 R08: 0000000000000000 R09: 0000000000000000 [   27.052393] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888009e46b68 [   27.052397] R13: 0000000000000200 R14: 0000000000000000 R15: ffff88800a887040 [   27.052404] FS:  0000000000000000(0000) GS:ffff88808ca57000(0000) knlGS:0000000000000000 [   27.052408] CS:  e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [   27.052412] CR2: 00007f9714004360 CR3: 0000000004834000 CR4: 0000000000050660 [   27.052418] Call Trace: [   27.052420]  \u003CTASK\u003E [   27.052422]  xen_9pfs_front_changed\u002B0x5d5/0x720 [   27.052426]  ? xenbus_otherend_changed\u002B0x72/0x140 [   27.052430]  ? __pfx_xenwatch_thread\u002B0x10/0x10 [   27.052434]  xenwatch_thread\u002B0x94/0x1c0 [   27.052438]  ? __pfx_autoremove_wake_function\u002B0x10/0x10 [   27.052442]  kthread\u002B0xf8/0x240 [   27.052445]  ? __pfx_kthread\u002B0x10/0x10 [   27.052449]  ? __pfx_kthread\u002B0x10/0x10 [   27.052452]  ret_from_fork\u002B0x16b/0x1a0 [   27.052456]  ? __pfx_kthread\u002B0x10/0x10 [   27.052459]  ret_from_fork_asm\u002B0x1a/0x30 [   27.052463]  \u003C/TASK\u003E [   27.052465] Modules linked in: [   27.052471] ---[ end trace 0000000000000000 ]---",
  "published": "2026-05-06T12:16:45Z",
  "severity": "Important",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Double Free",
  "epss": 0.00317,
  "epssPercentile": 0.24755,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43249",
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.60.1",
      "fix": "SUSE-SU-2026:2482-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2482-1",
      "released": "2026-06-22T11:10:39Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "SUSE-SU-2026:23231-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1",
      "released": "2026-08-11T21:26:34Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
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      "fix": "SUSE-SU-2026:2482-1",
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      "released": "2026-08-11T21:26:34Z"
    },
    {
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      "product": "kernel-default",
      "release": "opensuse-leap 16.0",
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    {
      "platform": "linux",
      "product": "kernel-default",
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      "fix": "SUSE-SU-2026:2482-1",
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      "fix": "SUSE-SU-2026:23237-1",
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      "released": "2026-08-11T21:34:22Z"
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      "platform": "linux",
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    {
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    {
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    {
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      "product": "kernel-kvmsmall",
      "release": "opensuse-leap 16.0",
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      "platform": "linux",
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-11T21:26:34Z"
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    {
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      "released": "2026-05-15T16:01:09Z"
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      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}