# CVE-2026-52990: linux: In the Linux kernel, the following vulnerability has been resolved:  fsnotify: fix inode reference leak in fsnotify_r...

CVE-2026-52990 is fixed in 52 products on 1 platform, first by ALAS2023-2026-1894, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-52990
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  fsnotify: fix inode reference leak in fsnotify_recalc_mask()  fsnotify_recalc_mask() fails to handle the return value of __fsnotify_recalc_mask(), which may return an inode pointer that needs to be released via fsnotify_drop_object() when the connector's HAS_IREF flag transitions from set to cleared.  This manifests as a hung task with the following call trace:    INFO: task umount:1234 blocked for more than 120 seconds.   Call Trace:    __schedule    schedule    fsnotify_sb_delete    generic_shutdown_super    kill_anon_super    cleanup_mnt    task_work_run    do_exit    do_group_exit  The race window that triggers the iref leak:    Thread A (adding mark)              Thread B (removing mark)   ──────────────────────              ────────────────────────   fsnotify_add_mark_locked():     fsnotify_add_mark_list():       spin_lock(conn->lock)       add mark_B(evictable) to list       spin_unlock(conn->lock)     return      /* ---- gap: no lock held ---- */                                        fsnotify_detach_mark(mark_A):                                         spin_lock(mark_A->lock)                                         clear ATTACHED flag on mark_A                                         spin_unlock(mark_A->lock)                                         fsnotify_put_mark(mark_A)      fsnotify_recalc_mask():       spin_lock(conn->lock)       __fsnotify_recalc_mask():         /* mark_A skipped: ATTACHED cleared */         /* only mark_B(evictable) remains */         want_iref = false         has_iref = true  /* not yet cleared */         -> HAS_IREF transitions true -> false         -> returns inode pointer       spin_unlock(conn->lock)       /* BUG: return value discarded!        * iput() and fsnotify_put_sb_watched_objects()        * are never called */  Fix this by deferring the transition true -> false of HAS_IREF flag from fsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-azure sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.38.1.160000.2.22 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.81.1.150700.17.45.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.38.1.160000.2.23 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-livepatch-6.12.92-122.166 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel-livepatch-6.18.33-63.124 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel-livepatch-SLE15-SP7-RT_Update_20 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2026:4120-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4120-1.md) | Sep 10, 2026 |
| Linux | kernel-livepatch-SLE15-SP7_Update_21 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.38.1 | [OPENSUSE-SU-2026:21910-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21910-1.md) | Sep 22, 2026 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.81.1 | [SUSE-SU-2026:4254-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4254-1.md) | Oct 7, 2026 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.38.1 | [SUSE-SU-2026:23902-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23902-1.md) | Sep 22, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.94-1 | [DEBIAN-CVE-2026-52990](https://patchblox.com/security/data/fix/linux/debian-cve-2026-52990.md) | Jun 25, 2026 |
| Linux | linux Debian 14 | 7.0.10-1 | [DEBIAN-CVE-2026-52990](https://patchblox.com/security/data/fix/linux/debian-cve-2026-52990.md) | Jun 25, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.92-122.166.amzn2023 | [ALAS2023-2026-1894](https://patchblox.com/security/data/fix/linux/alas2023-2026-1894.md) | Jun 22, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.33-63.124.amzn2023 | [ALAS2023-2026-1866](https://patchblox.com/security/data/fix/linux/alas2023-2026-1866.md) | Jun 22, 2026 |

---

Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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