CVE-2021-37576

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-26 · updated 2026-06-17
Weakness: CWE-787

Description

arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory corruption via rtas_args.nargs, aka CID-f62f3c20647e.

Affected products

Fedoraproject Fedora: 33, 34
Linux kernel: from 3.10 before 4.4.277; from 4.5 before 4.9.277; from 4.10 before 4.14.241; from 4.15 before 4.19.199; from 4.20 before 5.4.136; from 5.5 before 5.10.54 — fixed in 4.14.241, 4.19.199, 4.4.277, 4.9.277, 5.10.54, 5.13.6

How to fix

Upgrade to a fixed version: Linux kernel 4.14.241, 4.19.199, 4.4.277, 4.9.277. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2021/07/27/2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f62f3c20647ebd5fb6ecb8f0b477b9281c44c10a
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDFA7DSQIPM7XPNXJBXFWXHJFVUBCAG6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2YZ2DNURMYYVDT2NYAFDESJC35KCUDS/
https://lore.kernel.org/linuxppc-dev/87im0x1lqi.fsf%40mpe.ellerman.id.au/T/#u
https://security.netapp.com/advisory/ntap-20210917-0005/
https://www.debian.org/security/2021/dsa-4978
http://www.openwall.com/lists/oss-security/2021/07/27/2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f62f3c20647ebd5fb6ecb8f0b477b9281c44c10a
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDFA7DSQIPM7XPNXJBXFWXHJFVUBCAG6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2YZ2DNURMYYVDT2NYAFDESJC35KCUDS/
https://lore.kernel.org/linuxppc-dev/87im0x1lqi.fsf%40mpe.ellerman.id.au/T/#u

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