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CVE-2020-8835

HIGHCVSS 7.8/10EPSS 6.06%

Last modified

CVE-2020-8835 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. EPSS estimates a 6.06% chance of exploitation in the next 30 days.

Description

In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
6.06%

92.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel>= 5.4.7, < 5.4.29
LinuxLinux Kernel>= 5.5.0, < 5.5.14
LinuxLinux Kernel>= 5.6, < 5.6.1
FedoraprojectFedora30
FedoraprojectFedora31
FedoraprojectFedora32
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux19.10
NetappCloud BackupAll versions
NetappHci Management NodeAll versions
NetappSolidfireAll versions
NetappSteelstore Cloud Integrated StorageAll versions
NetappA700s FirmwareAll versions
Netapp8300 FirmwareAll versions
Netapp8700 FirmwareAll versions
NetappA400 FirmwareAll versions
NetappA320 FirmwareAll versions
NetappC190 FirmwareAll versions
NetappA220 FirmwareAll versions
NetappFas2720 FirmwareAll versions
NetappFas2750 FirmwareAll versions
NetappA800 FirmwareAll versions
NetappH300s FirmwareAll versions
NetappH500s FirmwareAll versions
NetappH700s FirmwareAll versions
NetappH300e FirmwareAll versions
NetappH500e FirmwareAll versions
NetappH700e FirmwareAll versions
NetappH410s FirmwareAll versions
NetappH610c FirmwareAll versions
NetappH610s FirmwareAll versions
NetappH615c FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-8835?
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
How severe is CVE-2020-8835?
CVE-2020-8835 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 6.06% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8835?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST