CVE-2026-98072 (GCVE-0-2026-98072)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-19 09:13
Severity ?
Summary
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 ("rds: introduce acquire/release ordering in acquire/release_in_xmit()") 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1e1e4316fcaeb9cd6bc56c91127e88625237dd44
Version: 8c378cc522aedd5fa5aa53486b43a4d552fbbd5c
Version: 52287ed416a10bc3d3e204a3186d9509ab3ee634
Version: 4a4dffdff9ea6201665f5d0a5042011d09bd527f
Version: 1422f28826d2a0c11e5240b3e951c9e214d8656e
Version: 1422f28826d2a0c11e5240b3e951c9e214d8656e
Version: 1422f28826d2a0c11e5240b3e951c9e214d8656e
Version: 1422f28826d2a0c11e5240b3e951c9e214d8656e
Version: bec6c4ce1169a565c58c347d5d0ac22e46d507d6
Version: f781fb5177cdfd9a6c98cd94e30275457c6461ac
Version: 917135195200e20e5244b9c3f2bb40f3d5e02510
Version: d792459a6e2ae21c7f5107babd63e52e4c5ab93a
Version: 5.10.214   ≤
Version: 5.15.153   ≤
Version: 6.1.83   ≤
Version: 6.6.23   ≤
Version: 4.19.311   ≤
Version: 5.4.273   ≤
Version: 6.7.11   ≤
Version: 6.8.2   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: use wq_has_sleeper() in release_in_xmit()\n\nrelease_in_xmit() clears RDS_IN_XMIT with clear_bit_unlock() and then\nchecks waitqueue_active() to decide whether anyone needs waking.\nclear_bit_unlock() is only a release operation: it orders the\ncritical section before the bit clear, but does not order the\nsubsequent plain load of the wait queue head after it.  The waiter\nside does the mirror image - it adds itself to the wait queue and\nthen tests the bit.  That is the classic store-buffering pattern: the\nreleasing CPU can read the wait queue as empty while the waiting CPU\nstill reads the bit as set, so the sleeper is never woken.\n\nThe waiters are rds_conn_shutdown() and rds_tcp_reset_callbacks(),\nboth in uninterruptible wait_event() with no timeout.  A lost wake-up\nstrands the shutdown worker on its single-threaded workqueue until\nsome other sender releases the bit again - and on a connection that\nis being torn down precisely because it failed, there may never be\nanother sender.\n\nThe barrier used to be there: release_in_xmit() did clear_bit()\nfollowed by smp_mb__after_atomic() until commit 1422f28826d2 (\"rds:\nintroduce acquire/release ordering in acquire/release_in_xmit()\")\nfolded both into clear_bit_unlock(), which strengthened the lock\nhand-off but silently dropped the full barrier the wake-up check\ndepends on.  The refill counterpart, release_refill() in\nnet/rds/ib_recv.c, still carries its smp_mb__after_atomic() for\nexactly this reason.\n\nUse wq_has_sleeper(), which is waitqueue_active() preceded by the\nrequired full barrier."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:13:21.939Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6f552364d97cf4005c7a58f11c9f79e14e269865"
        },
        {
          "url": "https://git.kernel.org/stable/c/a94b1dfc82454c5bc068e71c25393af674daf63b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a806ed1eb46850ca4159a18b2a8c4b70f0c1341"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d401934b7edb3ccb07d982dabadd04c45ee307c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed7ee0cd0e136d02f87f13181b1a89880463c7e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a269795107f45adc95975a83324f8fef40bec4ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/3764627b30a283e611e652c4a2bb8cdc74a75a99"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d0c8b7073913011459cf968cbbadd341e166bc3"
        }
      ],
      "title": "net/rds: use wq_has_sleeper() in release_in_xmit()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98072",
    "datePublished": "2026-09-25T10:24:12.675Z",
    "dateReserved": "2026-09-25T10:19:56.074Z",
    "dateUpdated": "2026-10-19T09:13:21.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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