Medium 4.7Published Mar 20, 2021

CVE-2020-27170An issue was discovered in the Linux kernel before 5.11.8.

Updated under an hour ago (Oct 26, 2026, 7:00 PM ET)

Does this affect you?

It affects linux_kernel and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for linux_kernel

Exploited in the last 30 days

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: 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Modified
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

linux linux_kernel linux:linux_kernel	before 5.11.8	NVD
fedoraproject fedora fedoraproject:fedora	32; 33; 34	NVD
canonical ubuntu_linux canonical:ubuntu_linux	14.04; 16.04; 18.04; 20.04	NVD
debian debian_linux debian:debian_linux	9.0	NVD

References

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8	x-refsource-misc
https://www.openwall.com/lists/oss-security/2021/03/19/2	x-refsource-misc
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76	x-refsource-misc
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/	vendor-advisory, x-refsource-fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/	vendor-advisory, x-refsource-fedora
http://www.openwall.com/lists/oss-security/2021/03/24/4	mailing-list, x-refsource-mlist
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/	vendor-advisory, x-refsource-fedora
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html	mailing-list, x-refsource-mlist
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.