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.
References
Configurations
Configuration 1 (hide)
|
History
10 Jun 2026, 19:19
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/0559a0e962aacbb47519e26ee663be04b72dcb92 - Patch | |
| References | () https://git.kernel.org/stable/c/42dd1c91f993431d0b399502479d00e6ad1bca71 - Patch | |
| References | () https://git.kernel.org/stable/c/ab1eaf9d5c99042f5b0243bf67a06283a4c0757f - Patch | |
| References | () https://git.kernel.org/stable/c/b0e4395870eb3441ddc959f6710b5f6ca61aff26 - Patch | |
| References | () https://git.kernel.org/stable/c/ed78aeebef05212ef7dca93bd931e4eff67c113f - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.7 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-367 |
28 May 2026, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-28 10:16
Updated : 2026-06-10 19:19
NVD link : CVE-2026-46194
Mitre link : CVE-2026-46194
CVE.ORG link : CVE-2026-46194
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition