CVE-2026-53303
f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()
Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.
INFO
Published Date :
June 26, 2026, 8:17 p.m.
Last Modified :
July 6, 2026, 8:24 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Hold sb_lock around extension list reads in f2fs_sbi_show().
- Ensure consistent data access during sysfs store operations.
- Update the Linux kernel to the latest resolved version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53303.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53303 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53303
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53303 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53303 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.17 up to (excluding) 6.1.175 Added Reference Type kernel.org: https://git.kernel.org/stable/c/4b3a1bf4c2ffd4c9595d900ead78c9035894a025 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4eb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 26, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': 'd3ff0c121bbaef026df6248ab7ef6f0b068b0647', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': 'cea15f66b7b68b2c50943a6660e0692c6635e4eb', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': '4b3a1bf4c2ffd4c9595d900ead78c9035894a025', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': 'd0e877810baf613b018fd9747440b9d4d9db1428', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': 'ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a06cbbb5f7fd03589cff9178314af04c568826', 'lessThan': '5909bedbed38c558bee7cb6758ceedf9bc3a9194', 'versionType': 'git'}], 'programFiles': ['fs/f2fs/sysfs.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/f2fs/sysfs.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation. Added Reference https://git.kernel.org/stable/c/4b3a1bf4c2ffd4c9595d900ead78c9035894a025 Added Reference https://git.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194 Added Reference https://git.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4eb Added Reference https://git.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428 Added Reference https://git.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647 Added Reference https://git.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e