CVE-2021-46972: ovl: fix leaked dentry
First published: Tue Feb 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ovl: fix leaked dentry Since commit 6815f479ca90 ("ovl: use only uppermetacopy state in ovl_lookup()"), overlayfs doesn't put temporary dentry when there is a metacopy error, which leads to dentry leaks when shutting down the related superblock: overlayfs: refusing to follow metacopy origin for (/file0) ... BUG: Dentry (____ptrval____){i=3f33,n=file3} still in use (1) [unmount of overlay overlay] ... WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1 ... RIP: 0010:umount_check.cold+0x107/0x14d ... Call Trace: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0 ? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 shrink_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 cleanup_mnt+0x22e/0x370 __cleanup_mnt+0x1a/0x30 task_work_run+0x139/0x210 do_exit+0xb0c/0x2820 ? __kasan_check_read+0x1d/0x30 ? find_held_lock+0x35/0x160 ? lock_release+0x1b6/0x660 ? mm_update_next_owner+0xa20/0xa20 ? reacquire_held_locks+0x3f0/0x3f0 ? __sanitizer_cov_trace_const_cmp4+0x22/0x30 do_group_exit+0x135/0x380 __do_sys_exit_group.isra.0+0x20/0x20 __x64_sys_exit_group+0x3c/0x50 do_syscall_64+0x45/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xae ... VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day... This fix has been tested with a syzkaller reproducer.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10.35 | 5.10.35 |
| redhat/kernel | <5.11.19 | 5.11.19 |
| redhat/kernel | <5.12.2 | 5.12.2 |
| redhat/kernel | <5.13 | 5.13 |
| Linux Kernel | >=5.8<5.10.35 | |
| Linux Kernel | >=5.11<5.11.19 | |
| Linux Kernel | >=5.12<5.12.2 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-46972
- https://lore.kernel.org/linux-cve-announce/2024022721-CVE-2021-46972-2ec2@gregkh/T/#u
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2266832
- https://access.redhat.com/errata/RHSA-2024:4211
- https://access.redhat.com/errata/RHSA-2024:4352
- https://bugzilla.redhat.com/show_bug.cgi?id=2266831
- https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95
- https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94
- https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8
- https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-46972?
CVE-2021-46972 is classified as a moderate severity vulnerability affecting the Linux kernel.
How do I fix CVE-2021-46972?
To fix CVE-2021-46972, you should update your Linux kernel to the latest patched versions 5.10.35, 5.11.19, 5.12.2, or 5.13.
Which Linux kernel versions are affected by CVE-2021-46972?
CVE-2021-46972 affects Linux kernel versions between 5.8 and 5.13.
What type of vulnerability is CVE-2021-46972?
CVE-2021-46972 is a vulnerability related to the overlay filesystem in the Linux kernel.
Is there a patch available for CVE-2021-46972?
Yes, patches to resolve CVE-2021-46972 are included in specific kernel updates for versions 5.10.35, 5.11.19, 5.12.2, and 5.13.
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