{ "cveId": "CVE-2026-89647", "url": "https://patchblox.com/security/cve/CVE-2026-89647", "summary": "CVE-2026-89647 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89647, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "ceph: do not repeat ceph_trim_dentries() if no progress possible", "description": "In the Linux kernel, the following vulnerability has been resolved: ceph: do not repeat ceph_trim_dentries() if no progress possible ceph_cap_reclaim_work() re-queues itself for as long as ceph_trim_dentries() returns -EAGAIN, which happens whenever a lease walk exhausts its \u0060nr_to_scan\u0060 budget. This creates a busy loop that consumes CPU without making any progress when there is nothing to reclaim: with no cap pressure (\u0060count==0\u0060) and every scanned lease still valid, each pass runs the full scan budget down to zero and returns \u0060-EAGAIN\u0060, only to be queued again immediately. The dir-lease walk made this worse. When \u0060expire_dir_lease\u0060 is \u0060false\u0060 (i.e. we have no intention of reclaiming dir leases), __dir_lease_check() returned \u0060TOUCH\u0060 for every valid lease. \u0060TOUCH\u0060 moves the dentry to the tail of the list and resets \u0060di-\u003Etime\u0060 via __dentry_dir_lease_touch(), so a walk over N valid leases pointlessly rewrote the list, refreshed the timestamps (preventing them from ever aging out) and always drained \u0060nr_to_scan\u0060, guaranteeing the \u0060-EAGAIN\u0060 requeue. Fix this in three steps: - Return \u0060KEEP\u0060 instead of \u0060TOUCH\u0060 when \u0060expire_dir_lease\u0060 is \u0060false\u0060. If we are not going to reclaim the lease, leave it in place instead of churning the list and resetting its timestamp; the walk then terminates naturally (or via \u0060STOP\u0060 at the first fresh lease). - Only return \u0060-EAGAIN\u0060 from the first (dentry-lease) walk when something was actually freed. A full batch that frees nothing means retrying the same list immediately is futile; fall through to the dir-lease walk instead. - After both walks, bail out with success (0) when nothing was freed and there is no cap pressure (\u0060count==0\u0060). There is no reason to keep retrying when we are not over the cap limit and made no progress. Under real cap pressure (\u0060count\u003E0\u0060) the reclaim path is unchanged and still retries via \u0060-EAGAIN\u0060. Without this patch, I saw 500 ceph_trim_dentries() calls per second on our web servers. This is very visible in \u0060/proc/lock_stat\u0060 (5 minute capture): class name con-bounces contentions waittime-min waittime-max waittime-total waittime-avg acq-bounces acquisitions holdtime-min holdtime-max holdtime-total holdtime-avg \u0026mdsc-\u003Edentry_list_lock: 126180 128218 0.04 8063.44 15986965.20 124.69 1573354 5296812 0.04 8291.28 74164526.48 14.00 ----------------------- \u0026mdsc-\u003Edentry_list_lock 111736 [\u003C000000007b11e319\u003E] __ceph_dentry_dir_lease_touch\u002B0x7c/0xa8 \u0026mdsc-\u003Edentry_list_lock 2631 [\u003C0000000050597999\u003E] __dentry_leases_walk\u002B0x64/0x2c8 \u0026mdsc-\u003Edentry_list_lock 3878 [\u003C00000000c0022f62\u003E] __ceph_dentry_lease_touch\u002B0x5c/0xa8 \u0026mdsc-\u003Edentry_list_lock 9973 [\u003C000000002f27cb6f\u003E] __dentry_lease_unlist\u002B0x50/0xa0 ----------------------- \u0026mdsc-\u003Edentry_list_lock 123621 [\u003C0000000050597999\u003E] __dentry_leases_walk\u002B0x64/0x2c8 \u0026mdsc-\u003Edentry_list_lock 1822 [\u003C000000007b11e319\u003E] __ceph_dentry_dir_lease_touch\u002B0x7c/0xa8 \u0026mdsc-\u003Edentry_list_lock 2720 [\u003C000000002f27cb6f\u003E] __dentry_lease_unlist\u002B0x50/0xa0 \u0026mdsc-\u003Edentry_list_lock 55 [\u003C00000000c0022f62\u003E] __ceph_dentry_lease_touch\u002B0x5c/0xa8 With this patch: class name con-bounces contentions waittime-min waittime-max waittime-total waittime-avg acq-bounces acquisitions holdtime-min holdtime-max holdtime-total holdtime-avg \u0026mdsc-\u003Edentry_list_lock: 1203 1215 0.16 408.88 33082.88 27.23 4320501 7357389 0.04 500.64 1961578.00 0.27 ----------------------- \u0026mdsc-\u003Edentry_list_lock 1029 [\u003C000000003c9aea8a\u003E] __ceph_dentry_dir_lease_touch\u002B0x7c/0xa8 \u0026mdsc-\u003Edentry_list_lock 1 ---truncated---", "published": "2026-09-11T20:19:50Z", "severity": "Important", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00675, "epssPercentile": 0.52452, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89647", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.110-135.201.amzn2023", "fix": "ALAS2023-2026-3196", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.110-135.201.amzn2023", "fix": "ALAS2023-2026-3196", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel-livepatch-6.12.110-135.201", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3196", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.51-120.162", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": 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