CVE-2020-11669 — An issue was discovered in the Linux kernel before 5

An issue was discovered in the Linux kernel before 5.2 on the powerpc platform. arch/powerpc/kernel/idle_book3s.S does not have save/restore functionality for PNV_POWERSAVE_AMR, PNV_POWERSAVE_UAMOR, and PNV_POWERSAVE_AMOR, aka CID-53a712bae5dd.

01What is this vulnerability?

An issue was discovered in the Linux kernel before 5.2 on the powerpc platform. arch/powerpc/kernel/idle_book3s.S does not have save/restore functionality for PNV_POWERSAVE_AMR, PNV_POWERSAVE_UAMOR, and PNV_POWERSAVE_AMOR, aka CID-53a712bae5dd.

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: 2020-04-10T14:40:19.000Z
• Last modified: 2024-08-04T11:35:13.507Z

09References

• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:3517
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
• lists.ozlabs.org — https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-April/208663.html
• lists.ozlabs.org — https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-April/208660.html
• lists.ozlabs.org — https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-April/208661.html
• github.com — https://github.com/torvalds/linux/commit/53a712bae5dd919521a58d7bad773b949358add…
• git.kernel.org — https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=53a71…
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
• security.netapp.com — https://security.netapp.com/advisory/ntap-20200430-0001/
• usn.ubuntu.com — https://usn.ubuntu.com/4368-1/
• usn.ubuntu.com — https://usn.ubuntu.com/4363-1/