{"id":"CVE-2026-98072","title":"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 an…","summary":"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 an…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-821"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1e1e4316fcaeb9cd6bc56c91127e88625237dd44 < 6f552364d97cf4005c7a58f11c9f79e14e269865","Linux >= 8c378cc522aedd5fa5aa53486b43a4d552fbbd5c < a94b1dfc82454c5bc068e71c25393af674daf63b","Linux >= 52287ed416a10bc3d3e204a3186d9509ab3ee634 < 5a806ed1eb46850ca4159a18b2a8c4b70f0c1341","Linux >= 4a4dffdff9ea6201665f5d0a5042011d09bd527f < 3d401934b7edb3ccb07d982dabadd04c45ee307c","Linux >= 1422f28826d2a0c11e5240b3e951c9e214d8656e < ed7ee0cd0e136d02f87f13181b1a89880463c7e9","Linux >= 1422f28826d2a0c11e5240b3e951c9e214d8656e < a269795107f45adc95975a83324f8fef40bec4ce","Linux >= 1422f28826d2a0c11e5240b3e951c9e214d8656e < 3764627b30a283e611e652c4a2bb8cdc74a75a99","Linux >= 1422f28826d2a0c11e5240b3e951c9e214d8656e < 6d0c8b7073913011459cf968cbbadd341e166bc3","Linux bec6c4ce1169a565c58c347d5d0ac22e46d507d6","Linux f781fb5177cdfd9a6c98cd94e30275457c6461ac","Linux 917135195200e20e5244b9c3f2bb40f3d5e02510","Linux d792459a6e2ae21c7f5107babd63e52e4c5ab93a","Linux >= 5.10.214 < 5.10.271","Linux >= 5.15.153 < 5.15.222","Linux >= 6.1.83 < 6.1.189","Linux >= 6.6.23 < 6.6.158","Linux >= 4.19.311 < 4.20","Linux >= 5.4.273 < 5.5","Linux >= 6.7.11 < 6.8","Linux >= 6.8.2 < 6.9","Linux 6.9"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:28.503","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98072","references":[{"url":"https://git.kernel.org/stable/c/3764627b30a283e611e652c4a2bb8cdc74a75a99","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3d401934b7edb3ccb07d982dabadd04c45ee307c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5a806ed1eb46850ca4159a18b2a8c4b70f0c1341","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6d0c8b7073913011459cf968cbbadd341e166bc3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6f552364d97cf4005c7a58f11c9f79e14e269865","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a269795107f45adc95975a83324f8fef40bec4ce","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a94b1dfc82454c5bc068e71c25393af674daf63b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed7ee0cd0e136d02f87f13181b1a89880463c7e9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98072.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98072"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541116"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98072"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98072"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98072.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00176,"epssPercentile":0.07122,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.838Z","slug":"CVE-2026-98072","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98072.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212357,"id":"CVE-2026-98072","ts":1790668157665,"field":"cvss","old":null,"new":"5.5"},{"seq":212356,"id":"CVE-2026-98072","ts":1790668157665,"field":"severity","old":"none","new":"medium"}]}