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CVE Record

CVE-2022-50770: ocfs2: fix memory leak in ocfs2_mount_volume()

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix memory leak in ocfs2_mount_volume() There is a memory leak reported by kmemleak: unreferenced object 0xffff88810cc65e60 (size 32): comm "mount.ocfs2", pid 23753, jiffies 4302528942 (age 34735.105s) hex dump (first 32 bytes): 10 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01 ................ 01 01 01 01 01 01 01 01 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8170f73d>] __kmalloc+0x4d/0x150 [<ffffffffa0ac3f51>] ocfs2_compute_replay_slots+0x121/0x330 [ocfs2] [<ffffffffa0b65165>] ocfs2_check_volume+0x485/0x900 [ocfs2] [<ffffffffa0b68129>] ocfs2_mount_volume.isra.0+0x1e9/0x650 [ocfs2] [<ffffffffa0b7160b>] ocfs2_fill_super+0xe0b/0x1740 [ocfs2] [<ffffffff818e1fe2>] mount_bdev+0x312/0x400 [<ffffffff819a086d>] legacy_get_tree+0xed/0x1d0 [<ffffffff818de82d>] vfs_get_tree+0x7d/0x230 [<ffffffff81957f92>] path_mount+0xd62/0x1760 [<ffffffff81958a5a>] do_mount+0xca/0xe0 [<ffffffff81958d3c>] __x64_sys_mount+0x12c/0x1a0 [<ffffffff82f26f15>] do_syscall_64+0x35/0x80 [<ffffffff8300006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 This call stack is related to two problems. Firstly, the ocfs2 super uses "replay_map" to trace online/offline slots, in order to recover offline slots during recovery and mount. But when ocfs2_truncate_log_init() returns an error in ocfs2_mount_volume(), the memory of "replay_map" will not be freed in error handling path. Secondly, the memory of "replay_map" will not be freed if d_make_root() returns an error in ocfs2_fill_super(). But the memory of "replay_map" will be freed normally when completing recovery and mount in ocfs2_complete_mount_recovery(). Fix the first problem by adding error handling path to free "replay_map" when ocfs2_truncate_log_init() fails. And fix the second problem by calling ocfs2_free_replay_slots(osb) in the error handling path "out_dismount". In addition, since ocfs2_free_replay_slots() is static, it is necessary to remove its static attribute and declare it in header file.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2022-50770 is a Linux kernel OCFS2 filesystem memory leak during failed mount/recovery paths. It can waste kernel memory when specific OCFS2 mount errors occur. The sources do not provide CVSS, active exploitation, or a complete operational impact assessment.

Executive priority

Treat as routine kernel hygiene unless OCFS2 is used in production clusters. Prioritize affected OCFS2 systems during normal maintenance windows, because the documented impact is memory leakage and sources do not show exploitation.

Technical view

The leak involves the OCFS2 replay_map allocation in ocfs2_mount_volume() and ocfs2_fill_super() error handling. If ocfs2_truncate_log_init() or d_make_root() fails, replay_map was not freed. Kernel stable commits add cleanup paths and expose ocfs2_free_replay_slots() for dismount error handling.

Likely exposure

Systems are most relevant if they run affected Linux kernel versions and enable or mount OCFS2 filesystems. General Linux hosts not using OCFS2 are less likely to encounter the vulnerable path, based on the provided description.

Exploitation context

No cited source states active exploitation, public exploit availability, or KEV listing. Triggering appears tied to OCFS2 mount failure paths, not remote network input. Practical risk depends on OCFS2 usage and who can initiate mounts.

Researcher notes

Evidence is limited to the kernel CVE description and stable commits. No CVSS, CWE, exploit status, or distro-specific fixed package data is provided. Avoid assuming remote reachability or privilege requirements beyond the OCFS2 mount context shown in the stack trace.

Mitigation direction

  • Update to a Linux kernel package containing the referenced stable OCFS2 fixes.
  • If OCFS2 is unused, consider disabling or not loading the OCFS2 module per vendor guidance.
  • Track distribution advisories for backported fixes and affected package versions.

Validation and detection

  • Inventory Linux hosts and kernel versions against vendor advisories.
  • Identify hosts with OCFS2 enabled, loaded, or mounted.
  • Check kernel changelogs for the referenced OCFS2 replay_map cleanup commits.
  • Review logs or kmemleak findings for OCFS2 mount-related memory leaks.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9140db04ef185f934acf2b1b15b3dd5e6a6bfc22, 9140db04ef185f934acf2b1b15b3dd5e6a6bfc22, 9140db04ef185f934acf2b1b15b3dd5e6a6bfc22, 9140db04ef185f934acf2b1b15b3dd5e6a6bfc22, 9140db04ef185f934acf2b1b15b3dd5e6a6bfc22, 9140db04ef185f934acf2b1b15b3dd5e6a6bfc22unaffected
LinuxLinux2.6.30, 0, 5.4.229, 5.10.163, 5.15.107, 6.0.16, 6.1.2, 6.2affected
Weakness

CWE details

No CWE listed

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