scsi: mpi3mr: Use number of bits to manage bitmap sizes

Summary

CVE	CVE-2023-53376
State	PUBLISHED
Assigner	Linux
Source Priority	CVE Program / NVD first with legacy fallback
Published	2025-09-18 14:15:40 UTC
Updated	2026-08-04 10:19:04 UTC
Description	In the Linux kernel, the following vulnerability has been resolved: scsi: mpi3mr: Use number of bits to manage bitmap sizes To allocate bitmaps, the mpi3mr driver calculates sizes of bitmaps using byte as unit. However, bitmap helper functions assume that bitmaps are allocated using unsigned long as unit. This gap causes memory access beyond the bitmap sizes and results in "BUG: KASAN: slab-out-of-bounds". The BUG was observed at firmware download to eHBA-9600. Call trace indicated that the out-of-bounds access happened in find_first_zero_bit() called from mpi3mr_send_event_ack() for miroc->evtack_cmds_bitmap. To fix the BUG, do not use bytes to manage bitmap sizes. Instead, use number of bits, and call bitmap helper functions which take number of bits as arguments. For memory allocation, call bitmap_zalloc() instead of kzalloc() and krealloc(). For memory free, call bitmap_free() instead of kfree(). For zero clear, call bitmap_clear() instead of memset(). Remove three fields for bitmap byte sizes in struct scmd_priv which are no longer required. Replace the field dev_handle_bitmap_sz with dev_handle_bitmap_bits to keep number of bits of removepend_bitmap across resize.

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
3.1	ADP	DECLARED	7.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
3.1	416baaa9-dc9f-4396-8d5f-8c081fb06d67	Secondary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	134c704f-9b21-4f2e-91b3-4a467353bcc0	Secondary	7.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
3.1	CNA	DECLARED	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Linux	Linux Kernel	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Linux	Linux	affected 824a156633dfdb0e17979a0d0bb2c757d1bb949c 6a675a6d57d31da43d8da576465c1cd5d5b0bd3d git	Not specified
CNA	Linux	Linux	affected 824a156633dfdb0e17979a0d0bb2c757d1bb949c 8ac713d2e9845e9234bb12ae5903040685d5aff9 git	Not specified
CNA	Linux	Linux	affected 824a156633dfdb0e17979a0d0bb2c757d1bb949c 339e61565f81a6534afdc18fd854b2e2628bf5db git	Not specified
CNA	Linux	Linux	affected 5.14	Not specified
CNA	Linux	Linux	unaffected 5.14 semver	Not specified
CNA	Linux	Linux	unaffected 6.1.18 6.1.* semver	Not specified
CNA	Linux	Linux	unaffected 6.2.5 6.2.* semver	Not specified
CNA	Linux	Linux	unaffected 6.3 * original_commit_for_fix	Not specified

Reference	Source	Link	Tags
git.kernel.org/stable/c/8ac713d2e9845e9234bb12ae5903040685d5aff9	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
git.kernel.org/stable/c/339e61565f81a6534afdc18fd854b2e2628bf5db	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
git.kernel.org/stable/c/6a675a6d57d31da43d8da576465c1cd5d5b0bd3d	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org	Patch
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.