Bug 1205131 – VUL-0: CVE-2022-3872: kvm,qemu: sdhci: buffer data port register off-by-one read/write

Bug 1205131 - (CVE-2022-3872) VUL-0: CVE-2022-3872: kvm,qemu: sdhci: buffer data port register off-by-one read/write

(CVE-2022-3872)
Summary:	VUL-0: CVE-2022-3872: kvm,qemu: sdhci: buffer data port register off-by-one r...

Status:	NEW

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P3 - Medium Severity: Minor
Target Milestone:	---
Assigned To:	E-mail List
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/347270/
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Reported:	2022-11-07 10:16 UTC by Carlos López
Modified:	2023-01-12 08:53 UTC (History)
CC List:	1 user (show)

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Found By:	Security Response Team
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Description Carlos López 2022-11-07 10:16:22 UTC

rh#2140567

An off-by-one read/write issue was found in the SDHCI device of QEMU. It occurs when reading/writing the Buffer Data Port Register in sdhci_read_dataport and sdhci_write_dataport, respectively, if data_count == block_size. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=2140567
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-3872

Comment 1 Carlos López 2022-11-07 10:19:30 UTC

There are no commit references from RedHat. The most similar fix I could find would be the one below, although it is not an off-by-one bug but a reentrancy issue:
https://gitlab.com/qemu-project/qemu/-/commit/799f7f0104a3f2e0fea06ee7b31a1c293cd7c948

Comment 2 Carlos López 2023-01-12 08:53:18 UTC

Proposed patch (not merged yet):
https://lists.nongnu.org/archive/html/qemu-devel/2022-11/msg01161.html