CVE-2021-31829
kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a.
Does this matter?
Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.
Description
kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.31% probability · 24th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- linux/linux kernel · fedoraproject/fedora · debian/debian linux
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/801c6058d14a82179a7ee17a4b532cac6fad067fPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VWCZ6LJLENL2C3URW5ICARTACXPFCFN2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y4X2G5YAPYJGI3PFEZZNOTRYI33GOCCZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZI7OBCJQDNWMKLBP6MZ5NV4EUTDAMX6Q/
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/4Mailing List, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/801c6058d14a82179a7ee17a4b532cac6fad067fPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VWCZ6LJLENL2C3URW5ICARTACXPFCFN2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y4X2G5YAPYJGI3PFEZZNOTRYI33GOCCZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZI7OBCJQDNWMKLBP6MZ5NV4EUTDAMX6Q/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.