In the Linux kernel, the following vulnerability has been resolved:

usb-storage: alauda: Fix uninit-value in alauda_check_media()

Syzbot got KMSAN to complain about access to an uninitialized value in
the alauda subdriver of usb-storage:

BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0
drivers/usb/storage/alauda.c:1137
CPU: 0 PID: 12279 Comm: usb-storage Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460

The problem is that alauda_check_media() doesn't verify that its USB
transfer succeeded before trying to use the received data. What
should happen if the transfer fails isn't entirely clear, but a
reasonably conservative approach is to pretend that no media is
present.

A similar problem exists in a usb_stor_dbg() call in
alauda_get_media_status(). In this case, when an error occurs the
call is redundant, because usb_stor_ctrl_transfer() already will print
a debugging message.

Finally, unrelated to the uninitialized memory access, is the fact
that alauda_check_media() performs DMA to a buffer on the stack.
Fortunately usb-storage provides a general purpose DMA-able buffer for
uses like this. We'll use it instead.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00032.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
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Linux Kernel Subscribe

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/044f4446e06bb03c52216697b14867ebc555ad3b cve-icon cve-icon
https://git.kernel.org/stable/c/0d2d5282d39aed6f27dfe1ed60a5f3934ebd21cd cve-icon cve-icon
https://git.kernel.org/stable/c/153c3e85873cc3e2f387169783c3a227bad9a95a cve-icon cve-icon
https://git.kernel.org/stable/c/373e0ab8c4c516561493f1acf367c7ee7dc053c2 cve-icon cve-icon
https://git.kernel.org/stable/c/49d380bcd6cba987c6085fae6464c9c087e8d9a0 cve-icon cve-icon
https://git.kernel.org/stable/c/7a11d1e2625bdb2346f6586773b20b20977278ac cve-icon cve-icon
https://git.kernel.org/stable/c/a6ff6e7a9dd69364547751db0f626a10a6d628d2 cve-icon cve-icon
https://git.kernel.org/stable/c/fe7c3a445d22783d27fe8bd0521a8aab1eb9da65 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025120959-CVE-2023-53847-1f94@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-53847 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-53847 cve-icon
History

Wed, 10 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 09 Dec 2025 02:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: usb-storage: alauda: Fix uninit-value in alauda_check_media() Syzbot got KMSAN to complain about access to an uninitialized value in the alauda subdriver of usb-storage: BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137 CPU: 0 PID: 12279 Comm: usb-storage Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460 The problem is that alauda_check_media() doesn't verify that its USB transfer succeeded before trying to use the received data. What should happen if the transfer fails isn't entirely clear, but a reasonably conservative approach is to pretend that no media is present. A similar problem exists in a usb_stor_dbg() call in alauda_get_media_status(). In this case, when an error occurs the call is redundant, because usb_stor_ctrl_transfer() already will print a debugging message. Finally, unrelated to the uninitialized memory access, is the fact that alauda_check_media() performs DMA to a buffer on the stack. Fortunately usb-storage provides a general purpose DMA-able buffer for uses like this. We'll use it instead.
Title usb-storage: alauda: Fix uninit-value in alauda_check_media()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-09T01:30:10.344Z

Reserved: 2025-12-09T01:27:17.827Z

Link: CVE-2023-53847

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-09T16:17:25.137

Modified: 2025-12-09T18:37:13.640

Link: CVE-2023-53847

cve-icon Redhat

Severity : Low

Publid Date: 2025-12-09T00:00:00Z

Links: CVE-2023-53847 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.