{
  "cveId": "CVE-2026-63804",
  "url": "https://patchblox.com/security/cve/CVE-2026-63804",
  "summary": "CVE-2026-63804 is fixed in 49 products on 1 platform, first by DEBIAN-CVE-2026-63804, released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  gfs2: fix use-after-free in gfs2_qd_dealloc  gfs...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  gfs2: fix use-after-free in gfs2_qd_dealloc  gfs2_qd_dealloc(), called as an RCU callback from gfs2_qd_dispose(), accesses the superblock object sdp through qd-\u003Eqd_sbd after freeing qd. It does so to decrement sd_quota_count and wake up sd_kill_wait.  However, by the time the RCU callback runs, gfs2_put_super() may have already freed sdp via free_sbd().  This can happen when gfs2_quota_cleanup() is called during unmount: it disposes of quota objects via call_rcu() and then waits on sd_kill_wait with a 60-second timeout.  If the timeout expires, or if gfs2_gl_hash_clear() triggers additional qd_put() calls that schedule more RCU callbacks after the wait completes, gfs2_put_super() will proceed to free the superblock while RCU callbacks referencing it are still pending.  Add an rcu_barrier() before free_sbd() in gfs2_put_super() to ensure all pending RCU callbacks (including gfs2_qd_dealloc) have completed before the superblock is freed.",
  "published": "2026-07-19T12:16:53Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00132,
  "epssPercentile": 0.02789,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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