CVE-2026-64256
xfs: don't wrap around quota ids in dqiterate
Description
In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an unsigned 32-bit variable. If it happens to be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot for ID_MAX, then this addition will truncate to zero and the iteration starts over. Fix this by casting to u64.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply the latest Linux kernel updates.
- Ensure quota IDs are handled correctly.
- Verify XFS filesystem integrity after update.
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-2026-64256.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64256 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-2026-64256
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-2026-64256 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64256 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.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '249e311c2ba392ceaf9ebfc145a46922946f069a', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd1c4c40599c376aeb0c93068a2ae344e79ee4b90', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '2b14fe1e0924c6b901f4256456342569c5397abe', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd766e4e5e85d829629c3ba503802fe1303d7b591', 'versionType': 'git'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.8'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.8', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '249e311c2ba392ceaf9ebfc145a46922946f069a', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd1c4c40599c376aeb0c93068a2ae344e79ee4b90', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '2b14fe1e0924c6b901f4256456342569c5397abe', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd766e4e5e85d829629c3ba503802fe1303d7b591', 'versionType': 'git'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.8'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.8', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.2:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.8 up to (excluding) 6.12.96 Added Reference Type kernel.org: https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 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': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '249e311c2ba392ceaf9ebfc145a46922946f069a', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd1c4c40599c376aeb0c93068a2ae344e79ee4b90', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': '2b14fe1e0924c6b901f4256456342569c5397abe', 'versionType': 'git'}, {'status': 'affected', 'version': '21d7500929c8a0b10e22a6755850c6f9a9280284', 'lessThan': 'd766e4e5e85d829629c3ba503802fe1303d7b591', 'versionType': 'git'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.8'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.8', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/scrub/dqiterate.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an unsigned 32-bit variable. If it happens to be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot for ID_MAX, then this addition will truncate to zero and the iteration starts over. Fix this by casting to u64. Added Reference https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a Added Reference https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe Added Reference https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90 Added Reference https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591