CVE-2026-45961 (GCVE-0-2026-45961)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-05-27 12:18
VLAI
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gfs2_make_fs_rw() to properly handle the withdrawal case where quota initialization succeeds but the filesystem is then withdrawn.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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux 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)
Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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Quota cleanup is added\\nin gfs2_make_fs_rw() to properly handle the withdrawal case where\\nquota initialization succeeds but the filesystem is then withdrawn.\\n\\nThread leak backtrace (gfs2_freeze_lock_shared failure):\\n  unreferenced object 0xffff88801d7bca80 (size 4480):\\n    copy_process+0x3a1/0x4670 kernel/fork.c:2422\\n    kernel_clone+0xf3/0x6e0 kernel/fork.c:2779\\n    kthread_create_on_node+0x100/0x150 kernel/kthread.c:478\\n    init_threads+0xab/0x350 fs/gfs2/ops_fstype.c:611\\n    gfs2_fill_super+0xe5c/0x1240 fs/gfs2/ops_fstype.c:1265\\n\\nQuota leak backtrace (gfs2_make_fs_rw failure):\\n  unreferenced object 0xffff88812de7c000 (size 8192):\\n    gfs2_quota_init+0xe5/0x820 fs/gfs2/quota.c:1409\\n    gfs2_make_fs_rw+0x7a/0xe0 fs/gfs2/super.c:149\\n    gfs2_fill_super+0xfbb/0x1240 fs/gfs2/ops_fstype.c:1275\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/gfs2/ops_fstype.c\",\"fs/gfs2/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b66f723bb552ad59c2acb5d45ea45c890f84498b\",\"lessThan\":\"e54229ecf49add8451d5f765a32c86ab4446e06c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b66f723bb552ad59c2acb5d45ea45c890f84498b\",\"lessThan\":\"da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2f8623377f3e0cfaa80558631b8694d02a492b4c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c713ebf2fe3f469e4af4de60a3427689ffb7c5d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c2191e507147b1a22e9170ebb2aaa0f2902fcbfa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fc32dad3cdba18669c71893f3e6d96905b39b3f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.173\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.99\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.16\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.2.3\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/gfs2/ops_fstype.c\",\"fs/gfs2/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.173\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"DF6A0A9F-CF01-4C06-A4AC-AC7810053C8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.99\",\"versionEndExcluding\":\"5.16\",\"matchCriteriaId\":\"55A594E3-39FC-4F69-9614-C6FC3967986F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.16\",\"versionEndExcluding\":\"6.2\",\"matchCriteriaId\":\"E0F792B8-000E-4D97-B7F7-B3660397A964\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2.3\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"A1B47306-4D45-453F-B6FB-EAA8855020F3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e54229ecf49add8451d5f765a32c86ab4446e06c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
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      "cve": "CVE-2026-45961",
      "id": "CVE-2026-45961",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45961.json",
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}



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