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CVE Record

CVE-2022-50782: ext4: fix bug_on in __es_tree_search caused by bad quota inode

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug_on in __es_tree_search caused by bad quota inode We got a issue as fllows: ================================================================== kernel BUG at fs/ext4/extents_status.c:202! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 1 PID: 810 Comm: mount Not tainted 6.1.0-rc1-next-g9631525255e3 #352 RIP: 0010:__es_tree_search.isra.0+0xb8/0xe0 RSP: 0018:ffffc90001227900 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000077512a0f RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000002a10 RDI: ffff8881004cd0c8 RBP: ffff888177512ac8 R08: 47ffffffffffffff R09: 0000000000000001 R10: 0000000000000001 R11: 00000000000679af R12: 0000000000002a10 R13: ffff888177512d88 R14: 0000000077512a10 R15: 0000000000000000 FS: 00007f4bd76dbc40(0000)GS:ffff88842fd00000(0000)knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005653bf993cf8 CR3: 000000017bfdf000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_es_cache_extent+0xe2/0x210 ext4_cache_extents+0xd2/0x110 ext4_find_extent+0x5d5/0x8c0 ext4_ext_map_blocks+0x9c/0x1d30 ext4_map_blocks+0x431/0xa50 ext4_getblk+0x82/0x340 ext4_bread+0x14/0x110 ext4_quota_read+0xf0/0x180 v2_read_header+0x24/0x90 v2_check_quota_file+0x2f/0xa0 dquot_load_quota_sb+0x26c/0x760 dquot_load_quota_inode+0xa5/0x190 ext4_enable_quotas+0x14c/0x300 __ext4_fill_super+0x31cc/0x32c0 ext4_fill_super+0x115/0x2d0 get_tree_bdev+0x1d2/0x360 ext4_get_tree+0x19/0x30 vfs_get_tree+0x26/0xe0 path_mount+0x81d/0xfc0 do_mount+0x8d/0xc0 __x64_sys_mount+0xc0/0x160 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup ext4_enable_quotas ext4_quota_enable ext4_iget --> get error inode <5> ext4_ext_check_inode --> Wrong imode makes it escape inspection make_bad_inode(inode) --> EXT4_BOOT_LOADER_INO set imode dquot_load_quota_inode vfs_setup_quota_inode --> check pass dquot_load_quota_sb v2_check_quota_file v2_read_header ext4_quota_read ext4_bread ext4_getblk ext4_map_blocks ext4_ext_map_blocks ext4_find_extent ext4_cache_extents ext4_es_cache_extent __es_tree_search.isra.0 ext4_es_end --> Wrong extents trigger BUG_ON In the above issue, s_usr_quota_inum is set to 5, but inode<5> contains incorrect imode and disordered extents. Because 5 is EXT4_BOOT_LOADER_INO, the ext4_ext_check_inode check in the ext4_iget function can be bypassed, finally, the extents that are not checked trigger the BUG_ON in the __es_tree_search function. To solve this issue, check whether the inode is bad_inode in vfs_setup_quota_inode().

UnknownCVSS not scoredNot KEV-listedUpdated
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Security readout for executives and security teams

Plain-English summary

CVE-2022-50782 is a Linux kernel ext4 filesystem flaw. A malformed quota inode on an ext4 filesystem can trigger a kernel BUG during mount, causing a crash or denial of service. The public record does not show active exploitation or a CVSS score.

Executive priority

Treat as a targeted availability risk. Patch through normal kernel maintenance, with faster action for platforms processing untrusted disk images or removable media.

Technical view

The issue occurs in ext4 quota handling when s_usr_quota_inum points to inode 5, EXT4_BOOT_LOADER_INO. Incorrect mode and disordered extents can bypass ext4_iget validation, then trigger BUG_ON in __es_tree_search during extents caching. The fix checks bad_inode in vfs_setup_quota_inode().

Likely exposure

Exposure is most relevant to systems that mount untrusted or externally supplied ext4 filesystems, disk images, removable media, or VM/container storage images. Standard servers using trusted local filesystems have lower likely exposure.

Exploitation context

Sources describe a mount-time kernel crash path, not privilege escalation or data theft. No CISA KEV listing is provided, and the bundle contains no cited evidence of exploitation in the wild.

Researcher notes

The source bundle lacks CVSS, CWE, and detailed version range semantics. Affected entries include kernel versions and stable commit references; validate against distro backports rather than raw upstream version strings alone.

Mitigation direction

  • Update affected Linux kernels using distribution or upstream stable guidance.
  • Prioritize hosts that mount untrusted ext4 media, images, or tenant-controlled storage.
  • Restrict who can mount filesystems on shared or multi-user systems.
  • Review vendor advisories for backported fixes matching the listed kernel lines.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and images.
  • Identify systems using ext4 with quota support enabled.
  • Check whether kernel packages include the referenced stable fix commits.
  • Review logs for ext4 mount failures followed by kernel BUG or crash events.
Prepared
Confidence
medium
Sources
5

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
8Source 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
LinuxLinux393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5, 393d1d1d76933886d5e1ce603214c9987589c6d5unaffected
LinuxLinux3.10, 0, 4.19.270, 5.4.229, 5.10.163, 5.15.87, 6.0.18, 6.1.4, 6.2affected
Weakness

CWE details

No CWE listed

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