Vulnerability Description
An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.11.8 |
| Fedoraproject | Fedora | 32 |
| Canonical | Ubuntu Linux | 14.04 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2021/03/24/4Mailing ListThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8PatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.openwall.com/lists/oss-security/2021/03/19/2Mailing ListPatchThird Party Advisory
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2021/03/24/4Mailing ListThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8PatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2020-27170?
CVE-2020-27170 is a vulnerability with a CVSS score of 4.7 (MEDIUM). An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spect...
How severe is CVE-2020-27170?
CVE-2020-27170 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-27170?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Fedoraproject Fedora, Canonical Ubuntu Linux, Debian Debian Linux.