CVE-2022-35414 — softmmu/physmem

softmmu/physmem.c in QEMU through 7.0.0 can perform an uninitialized read on the translate_fail path, leading to an io_readx or io_writex crash. NOTE: a third party states that the Non-virtualization Use Case in the qemu.org reference applies here, i.e., "Bugs affecting the

01What is this vulnerability?

softmmu/physmem.c in QEMU through 7.0.0 can perform an uninitialized read on the translate_fail path, leading to an io_readx or io_writex crash. NOTE: a third party states that the Non-virtualization Use Case in the qemu.org reference applies here, i.e., "Bugs affecting the non-virtualization use case are not considered security bugs at this time.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-07-11T01:48:46.000Z
• Last modified: 2024-08-03T09:36:44.144Z

09References

• github.com — https://github.com/qemu/qemu/blob/f200ff158d5abcb974a6b597a962b6b2fbea2b06/softm…
• github.com — https://github.com/qemu/qemu/commit/418ade7849ce7641c0f7333718caf5091a02fd4c
• github.com — https://github.com/qemu/qemu/commit/3517fb726741c109cae7995f9ea46f0cab6187d6#dif…
• github.com — https://github.com/qemu/qemu/blob/v7.0.0/include/exec/cpu-all.h#L145-L148
• github.com — https://github.com/qemu/qemu/commit/3517fb726741c109cae7995f9ea46f0cab6187d6#dif…
• gitlab.com — https://gitlab.com/qemu-project/qemu/-/issues/1065
• www.mail-archive.com — https://www.mail-archive.com/qemu-devel%40nongnu.org/msg895266.html
• sick.codes — https://sick.codes/sick-2022-113
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
• www.qemu.org — https://www.qemu.org/docs/master/system/security.html#non-virtualization-use-cas…