High severity · published Sep 11, 2026
CVE-2026-89584
block: validate user space vectors during extraction
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
block: validate user space vectors during extraction
The bio-based drivers don't necessarily check the alignment split, and
stacking block drivers don't always handle a misalignment detected after
submitting the bio. Validate user vectors against the device's
dma_alignment as the bio is built from the iov_iter, rejecting
misaligned early with -EINVAL.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
5ff3f74e145adc79b49668adb8de276446acf6be before d44a97a3b1c00cc571245124e23e5ceb0a0225a0; 5ff3f74e145adc79b49668adb8de276446acf6be before 14b007e178811db72fbb1ebb3535160db6ec1e6a; 6.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89584
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89584
git.kernel.org
https://git.kernel.org/stable/c/14b007e178811db72fbb1ebb3535160db6ec1e6a
git.kernel.org
https://git.kernel.org/stable/c/d44a97a3b1c00cc571245124e23e5ceb0a0225a0
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