serial: protect uart_port_dtr_rts() in uart_shutdown() too

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Summary

CVECVE-2024-50058
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 20:15:17 UTC
Updated2026-05-12 13:16:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: protect uart_port_dtr_rts() in uart_shutdown() too Commit af224ca2df29 (serial: core: Prevent unsafe uart port access, part 3) added few uport == NULL checks. It added one to uart_shutdown(), so the commit assumes, uport can be NULL in there. But right after that protection, there is an unprotected "uart_port_dtr_rts(uport, false);" call. That is invoked only if HUPCL is set, so I assume that is the reason why we do not see lots of these reports. Or it cannot be NULL at this point at all for some reason :P. Until the above is investigated, stay on the safe side and move this dereference to the if too. I got this inconsistency from Coverity under CID 1585130. Thanks.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 2fe399bb8efd0d325ab1138cf8e3ecf23a39e96d git Not specified
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 399927f0f875b93f3d5a0336d382ba48b8671eb2 git Not specified
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 d7b5876a6e74cdf8468a478be6b23f2f5464ac7a git Not specified
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 e418d91195d29d5f9c9685ff309b92b04b41dc40 git Not specified
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 76ed24a34223bb2c6b6162e1d8389ec4e602a290 git Not specified
CNA Linux Linux affected af224ca2df297440448b9d407d21b50982c6d532 602babaa84d627923713acaf5f7e9a4369e77473 git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 5.10.229 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.170 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.115 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.57 6.6.* semver Not specified
CNA Linux Linux unaffected 6.11.4 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/399927f0f875b93f3d5a0336d382ba48b8671eb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/602babaa84d627923713acaf5f7e9a4369e77473 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/d7b5876a6e74cdf8468a478be6b23f2f5464ac7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e418d91195d29d5f9c9685ff309b92b04b41dc40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/2fe399bb8efd0d325ab1138cf8e3ecf23a39e96d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76ed24a34223bb2c6b6162e1d8389ec4e602a290 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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