{
  "cveId": "CVE-2026-98231",
  "url": "https://patchblox.com/security/cve/CVE-2026-98231",
  "summary": "CVE-2026-98231 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-98231, released October 6, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "xfrm: serialize state GC with device state flush",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: serialize state GC with device state flush  The deferred-device pass in xfrm_dev_state_flush() finds states under xfrm_state_dev_gc_lock, but drops the lock before calling xfrm_dev_state_free() because the driver callback may sleep.  The device GC list does not hold an xfrm_state reference, so the state GC worker can destroy the same state concurrently.  The race can proceed as follows:    CPU 0                               CPU 1   find x on the device GC list   drop xfrm_state_dev_gc_lock   read x-\u003Exso.dev                                       xfrm_state_gc_destroy(x)                                       xfrm_dev_state_free(x)                                       xfrm_state_free(x)   continue xfrm_dev_state_free(x)  Both paths can invoke the driver callback and drop the device reference. CPU 0 can also access the xfrm_state after CPU 1 has freed it.  KASAN reported:    BUG: KASAN: slab-use-after-free in xfrm_dev_state_free\u002B0x24c/0x2a0   Read of size 8 at addr ffff88810bbaa960 by task poc/102    Call Trace:    xfrm_dev_state_free\u002B0x24c/0x2a0    xfrm_dev_state_flush\u002B0x353/0x400    xfrm_dev_event\u002B0x26d/0x3a0    notifier_call_chain\u002B0xc0/0x280    __dev_notify_flags\u002B0x169/0x250    netif_change_flags\u002B0xe7/0x160    dev_change_flags\u002B0x96/0x220    devinet_ioctl\u002B0x7f4/0x1880    Allocated by task 87:    xfrm_state_alloc\u002B0x1e/0x5c0    xfrm_add_sa\u002B0xe7f/0x5820    xfrm_user_rcv_msg\u002B0x4f3/0x940    Freed by task 57:    kmem_cache_free\u002B0xcb/0x3d0    xfrm_state_gc_task\u002B0x4a8/0x650    process_one_work\u002B0x63a/0x1070  Serialize xfrm_state destruction against the deferred-device pass with a mutex.  Keep xfrm_state_dev_gc_lock limited to list operations and retain the existing callback and device-reference release ordering.",
  "published": "2026-10-06T09:18:10Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00206,
  "epssPercentile": 0.10635,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98231",
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