f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count() (CVE-2022-49380) | HOL Guard CVE

Medium · CVSS 5.5CVE-2022-49380

f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()

Answer in brief

CVE-2022-49380 records a Medium severity (CVSS 5.5) vulnerability in f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 26, 2025Updated Aug 15, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 15, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <f8b3c3fcf33105bc1ee7788e3b51b0a1ae42ae53 \|\| >=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <2766ddaf45b69252bb8fe526b5b6e56904a9ae7a \|\| >=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <bce859358d3d5940aa858e40ceee70ee6e76130e \|\| >=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <89d9a48d0cd30429463ea4e37ca83be6773ed5eb \|\| >=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <ccffa99ae6a1f44797b57444c6a80382a42928fe \|\| >=39a53e0ce0df01b3cf4bb898c7ae2fd2189647d5 <4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e	f8b3c3fcf33105bc1ee7788e3b51b0a1ae42ae53, 2766ddaf45b69252bb8fe526b5b6e56904a9ae7a, bce859358d3d5940aa858e40ceee70ee6e76130e, 89d9a48d0cd30429463ea4e37ca83be6773ed5eb, ccffa99ae6a1f44797b57444c6a80382a42928fe, 4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e
Linux/Linuxgeneric	3.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to f8b3c3fcf33105bc1ee7788e3b51b0a1ae42ae53 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count() As Yanming reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215897 I have encountered a bug in F2FS file system in kernel v5.17. The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can reproduce the bug by running the following commands: The kernel message is shown below: kernel BUG at fs/f2fs/f2fs.h:2511! Call Trace: f2fs_remove_inode_page+0x2a2/0x830 f2fs_evict_inode+0x9b7/0x1510 evict+0x282/0x4e0 do_unlinkat+0x33a/0x540 __x64_sys_unlinkat+0x8e/0xd0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is: .total_valid_block_count or .total_valid_node_count could fuzzed to zero, then once dec_valid_node_count() was called, it will cause BUG_ON(), this patch fixes to print warning info and set SBI_NEED_FSCK into CP instead of panic.

Quoted source text, attributed separately from HOL analysis.