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Linux KernelOperating system · Linux

CVE-2022-49033

MEDIUM · 5.5 CVSS v3.1 Published 2024-10-21
Fix available
A fix is available. Upgrade to 4.14.301 / 4.19.268 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: btrfs: qgroup: fix sleep from invalid context bug in btrfs_qgroup_inherit() Syzkaller reported BUG as follows: BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274 Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 __might_resched.cold+0x222/0x26b kmem_cache_alloc+0x2e7/0x3c0 update_qgroup_limit_item+0xe1/0x390 btrfs_qgroup_inherit+0x147b/0x1ee0 create_subvol+0x4eb/0x1710 btrfs_mksubvol+0xfe5/0x13f0 __btrfs_ioctl_snap_create+0x2b0/0x430 btrfs_ioctl_snap_create_v2+0x25a/0x520 btrfs_ioctl+0x2a1c/0x5ce0 __x64_sys_ioctl+0x193/0x200 do_syscall_64+0x35/0x80 Fix this by calling qgroup_dirty() on @dstqgroup, and update limit item in btrfs_run_qgroups() later outside of the spinlock context.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:< 4.14.301>= 4.15, < 4.19.268>= 4.20, < 5.4.226>= 5.5, < 5.10.158>= 5.11, < 5.15.82>= 5.16, < 6.0.12= 6.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.14.301 / 4.19.268 / 5.4.226 or later
Fixed in 4.14.3014.19.2685.4.226
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux kernel >= 4.14.301, >= 4.19.268, >= 5.4.226, or >= 5.10.158 (depending on your base branch)

  1. Identify the currently running Linux kernel version using `uname -r`
  2. Determine which version branch your kernel derives from (e.g., 4.14.x, 4.19.x, 5.4.x, 5.10.x)
  3. Upgrade the Linux kernel to a version that includes the fix: for 4.14.x upgrade to >=4.14.301, for 4.19.x upgrade to >=4.19.268, for 5.4.x upgrade to >=5.4.226, or for 5.10.x upgrade to >=5.10.158
  4. After kernel upgrade, reboot the system to load the fixed kernel
  5. Verify the fix is applied by checking the kernel version and confirming the btrfs_qgroup_inherit function no longer calls update_qgroup_limit_item within spinlock context
Caveat Kernel upgrades may require infrastructure reboot and could have compatibility implications with custom modules or specific hardware drivers; test in staging first

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-49033 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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