Medium 5.5Published Sep 12, 2025

CVE-2025-39795block: avoid possible overflow for chunk_sectors check in blk_stack_limits()

Updated under an hour ago (Oct 26, 2026, 5:40 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value. However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 22ada802ede89829dd010a317d9b812b7df7111a before 418751910044649baa2b424ea31cce3fc4dcc253; 22ada802ede89829dd010a317d9b812b7df7111a builds before 8b3ce085b52e674290cbfdd07034e7653ffbe4dc; from 22ada802ede89829dd010a317d9b812b7df7111a before 31f2f080898e50cbf2bae62d35f9f2a997547b38; 22ada802ede89829dd010a317d9b812b7df7111a builds before 3b9d69f0e68aa6b0acd9791c45d445154a8c66e9; from 22ada802ede89829dd010a317d9b812b7df7111a before 46aa80ef49594ed7de685ecbc673b291e9a2c159; 22ada802ede89829dd010a317d9b812b7df7111a builds before 5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2; 22ada802ede89829dd010a317d9b812b7df7111a builds before 14beeef4aafecc8a41de534e31fb5be94739392f; from 22ada802ede89829dd010a317d9b812b7df7111a before 448dfecc7ff807822ecd47a5c052acedca7d09e8	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.10 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.43; from 6.13 before 6.15.11; from 6.16 before 6.16.2	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/418751910044649baa2b424ea31cce3fc4dcc253	patch
https://git.kernel.org/stable/c/8b3ce085b52e674290cbfdd07034e7653ffbe4dc	patch
https://git.kernel.org/stable/c/31f2f080898e50cbf2bae62d35f9f2a997547b38	patch
https://git.kernel.org/stable/c/3b9d69f0e68aa6b0acd9791c45d445154a8c66e9	patch
https://git.kernel.org/stable/c/46aa80ef49594ed7de685ecbc673b291e9a2c159	patch
https://git.kernel.org/stable/c/5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2	patch
https://git.kernel.org/stable/c/14beeef4aafecc8a41de534e31fb5be94739392f	patch
https://git.kernel.org/stable/c/448dfecc7ff807822ecd47a5c052acedca7d09e8	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	third-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
1–10 of 14

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.