{
  "cveId": "CVE-2026-98072",
  "url": "https://patchblox.com/security/cve/CVE-2026-98072",
  "summary": "CVE-2026-98072 is fixed in 58 products on 1 platform, first by DEBIAN-CVE-2026-98072, released September 29, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net/rds: use wq_has_sleeper() in release_in_xmit()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/rds: use wq_has_sleeper() in release_in_xmit()  release_in_xmit() clears RDS_IN_XMIT with clear_bit_unlock() and then checks waitqueue_active() to decide whether anyone needs waking. clear_bit_unlock() is only a release operation: it orders the critical section before the bit clear, but does not order the subsequent plain load of the wait queue head after it.  The waiter side does the mirror image - it adds itself to the wait queue and then tests the bit.  That is the classic store-buffering pattern: the releasing CPU can read the wait queue as empty while the waiting CPU still reads the bit as set, so the sleeper is never woken.  The waiters are rds_conn_shutdown() and rds_tcp_reset_callbacks(), both in uninterruptible wait_event() with no timeout.  A lost wake-up strands the shutdown worker on its single-threaded workqueue until some other sender releases the bit again - and on a connection that is being torn down precisely because it failed, there may never be another sender.  The barrier used to be there: release_in_xmit() did clear_bit() followed by smp_mb__after_atomic() until commit 1422f28826d2 (\u0022rds: introduce acquire/release ordering in acquire/release_in_xmit()\u0022) folded both into clear_bit_unlock(), which strengthened the lock hand-off but silently dropped the full barrier the wake-up check depends on.  The refill counterpart, release_refill() in net/rds/ib_recv.c, still carries its smp_mb__after_atomic() for exactly this reason.  Use wq_has_sleeper(), which is waitqueue_active() preceded by the required full barrier.",
  "published": "2026-09-25T11:17:36Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00177,
  "epssPercentile": 0.07258,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98072",
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  "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"
  }
}