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Review reviewHigh

CVE-2023-53376

Linux Linux, linux kernel

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-...

CVSS
7.1
EPSS
0.15%
4.78% percentile
CISA KEV
Not listed
Published
2025.09.18
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.1

Vulnerability overview

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-...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 824a156633dfdb0e17979a0d0bb2c757d1bb949c < 6a675a6d57d31da43d8da576465c1cd5d5b0bd3d, >= 824a156633dfdb0e17979a0d0bb2c757d1bb949c < 8ac713d2e9845e9234bb12ae5903040685d5aff9, >= 824a156633dfdb0e17979a0d0bb2c757d1bb949c < 339e61565f81a6534afdc18fd854b2e2628bf5db, >= 5.14, >= 5.14 < 6.1.18, >= 6.2 < 6.2.5
Fixed versions
6.1.18, 6.2.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125
CVE-2023-53376 — Linux Linux, linux kernel | SECUFOCUS NOW