CVE-2026-45961 (GCVE-0-2026-45961)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-10-15 10:07
VLAI
EPSS
VEX
Title
gfs2: fix memory leaks in gfs2_fill_super error path
Summary
In the Linux kernel, the following vulnerability has been resolved:
gfs2: fix memory leaks in gfs2_fill_super error path
Fix two memory leaks in the gfs2_fill_super() error handling path when
transitioning a filesystem to read-write mode fails.
First leak: kthread objects (thread_struct, task_struct, etc.)
When gfs2_freeze_lock_shared() fails after init_threads() succeeds, the
created kernel threads (logd and quotad) are never destroyed. This
occurs because the fail_per_node label doesn't call
gfs2_destroy_threads().
Second leak: quota bitmap buffer (8192 bytes)
When gfs2_make_fs_rw() fails after gfs2_quota_init() succeeds but
before other operations complete, the allocated quota bitmap is never
freed.
The fix moves thread cleanup to the fail_per_node label to handle all
error paths uniformly. gfs2_destroy_threads() is safe to call
unconditionally as it checks for NULL pointers. Quota cleanup is added
in gfs2_make_fs_rw() to properly handle the withdrawal case where
quota initialization succeeds but the filesystem is then withdrawn.
Thread leak backtrace (gfs2_freeze_lock_shared failure):
unreferenced object 0xffff88801d7bca80 (size 4480):
copy_process+0x3a1/0x4670 kernel/fork.c:2422
kernel_clone+0xf3/0x6e0 kernel/fork.c:2779
kthread_create_on_node+0x100/0x150 kernel/kthread.c:478
init_threads+0xab/0x350 fs/gfs2/ops_fstype.c:611
gfs2_fill_super+0xe5c/0x1240 fs/gfs2/ops_fstype.c:1265
Quota leak backtrace (gfs2_make_fs_rw failure):
unreferenced object 0xffff88812de7c000 (size 8192):
gfs2_quota_init+0xe5/0x820 fs/gfs2/quota.c:1409
gfs2_make_fs_rw+0x7a/0xe0 fs/gfs2/super.c:149
gfs2_fill_super+0xfbb/0x1240 fs/gfs2/ops_fstype.c:1275
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b66f723bb552ad59c2acb5d45ea45c890f84498b , < 4456be93464a599eac0eb2afa63b5d662e1599d8
(git)
Affected: b66f723bb552ad59c2acb5d45ea45c890f84498b , < e54229ecf49add8451d5f765a32c86ab4446e06c (git) Affected: b66f723bb552ad59c2acb5d45ea45c890f84498b , < da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102 (git) Affected: 2f8623377f3e0cfaa80558631b8694d02a492b4c (git) Affected: c713ebf2fe3f469e4af4de60a3427689ffb7c5d7 (git) Affected: c2191e507147b1a22e9170ebb2aaa0f2902fcbfa (git) Affected: 9fc32dad3cdba18669c71893f3e6d96905b39b3f (git) Affected: 5.10.173 , < 5.11 (semver) Affected: 5.15.99 , < 5.16 (semver) Affected: 6.1.16 , < 6.2 (semver) Affected: 6.2.3 , < 6.3 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.3
Unaffected: 0 , < 6.3 (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"id": "CVE-2026-45961",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: gfs2: fix memory leaks in gfs2_fill_super error path",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45961.json",
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}
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