Bug 2532242 (CVE-2026-89466)

Summary: CVE-2026-89466 kernel: power: supply: qcom_battmgr: terminate the strings from firmware
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's `qcom_battmgr` component, responsible for power supply management. This vulnerability occurs due to improper string termination when handling firmware-provided strings. A malicious or malformed firmware string that completely fills its buffer can lead to an out-of-bounds read, potentially disclosing sensitive information from adjacent memory locations to user space.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-11 21:38:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

power: supply: qcom_battmgr: terminate the strings from firmware

The qcom_battmgr_sc8280xp_strcpy() takes a Pascal-style string when the
firmware sends one. Otherwise it copies all BATTMGR_STRING_LEN bytes and
leaves the destination without a terminator.

Those destinations are model_number, serial_number and oem_info, each
BATTMGR_STRING_LEN and declared next to each other. They go out to user
space as val->strval, which power_supply_format_property() prints with
"%s", so a firmware string that fills the whole field makes that read run
into the following members.

Use strscpy() so the copy always terminates, the way the SM8350 path
already does for the same field.
Comment 1 Mauro Matteo Cascella 2026-09-17 19:57:47 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89466.mbox