CVE-2026-46194

Medium

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix node_cnt race between extent node destroy and writeback f2fs_destroy_extent_node() does not set FI_NO_EXTENT before clearing extent nodes. When called from f2fs_drop_inode() with I_SYNC set, concurrent kworker writeback can insert new extent nodes into the same extent tree, racing with the destroy and triggering f2fs_bug_on() in __destroy_extent_node(). The scenario is as follows: drop inode writeback - iput - f2fs_drop_inode // I_SYNC set - f2fs_destroy_extent_node - __destroy_extent_node - while (node_cnt) { write_lock(&et->lock) __free_extent_tree write_unlock(&et->lock) - __writeback_single_inode - f2fs_outplace_write_data - f2fs_update_read_extent_cache - __update_extent_tree_range // FI_NO_EXTENT not set, // insert new extent node } // node_cnt == 0, exit while - f2fs_bug_on(node_cnt) // node_cnt > 0 Additionally, __update_extent_tree_range() only checks FI_NO_EXTENT for EX_READ type, leaving EX_BLOCK_AGE updates completely unprotected. This patch set FI_NO_EXTENT under et->lock in __destroy_extent_node(), consistent with other callers (__update_extent_tree_range and __drop_extent_tree) and check FI_NO_EXTENT for both EX_READ and EX_BLOCK_AGE tree.

Package Linux Kernel
Published 2026-05-28
Last modified 2026-06-10
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

4.7

out of 10
Medium
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-367

CVE-2026-46194 is classified as CWE-367

See CWE-367 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.6.66, 6.12.5, 6.13 and later are affected. Fixed in 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1 and their respective stable series.

Affected from
≥ 6.6.66 ≥ 6.12.5 ≥ 6.13
Fixed in
✓ 6.6.140 6.6.x ✓ 6.12.88 6.12.x ✓ 6.18.30 6.18.x ✓ 7.0.7 7.0.x ✓ 7.1

References

5 total

Frequently asked questions

  • What is CVE-2026-46194?

    CVE-2026-46194 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 . It affects Linux kernel versions from 6.6.66 onward and has been patched in 6.6.140, 6.12.88, 6.18.30 and others. CVE-2026-46194 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-46194?

    CVE-2026-46194 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2026-46194?

    Yes. CVE-2026-46194 has been patched. Fixed versions include 6.6.140, 6.12.88, 6.18.30 and others. If you are running Linux kernel 6.6.66 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-46194 actively exploited?

    No. CVE-2026-46194 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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