CVE-2026-63860 (CVSS 8.4)

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Prefer NLA_NUL_STRING These attributes are evaluated as c-string (passed to strcmp), but NLA_STRING doesn't check for the presence of a \0 terminator. Either this needs to switch to nla_strcmp() and needs to adjust printf fmt specifier to not use plain %s, or this needs to use NLA_NUL_STRING. As the code has been this way for long time, it seems to me that userspace does include the terminating nul, even tough its not enforced so far, and thus NLA_NUL_STRING use is the simpler solution.

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CVSS v3.1 Score

8.4

HIGH

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

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/137b5918931d4d05aa8ea8d3adf67f7224eef63c https://git.kernel.org/stable/c/5877c043398d5fa0e93919a3d837e5cd7a98a961 https://git.kernel.org/stable/c/6ed3d14fc45d3da6025e7fe4a6a09066856698e2 https://git.kernel.org/stable/c/87111356d58d86edb221ba144d261ed83a5b8bbe https://git.kernel.org/stable/c/abda65bdd13084c771842adaac1f652d0660dd82 https://git.kernel.org/stable/c/c26a0052cceed4c4d380ee5808b699f937fb58d8 https://git.kernel.org/stable/c/f2c7b39dde2e61df8157066969cc2a408cd3dcd9 https://git.kernel.org/stable/c/fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf

Frequently Asked Questions

What is CVE-2026-63860? +

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Prefer NLA_NUL_STRING These attributes are evaluated as c-string (passed to strcmp), but NLA_STRING doesn't check for the presence of a \0 terminator. Either this needs to switch to nla_strcmp() and needs to adjust printf fmt specifier to not use plain %s, or this needs to use NLA_NUL_STRING. As the code has been this way for long time, it seems to me that userspace does include the terminating nul, even tough its not enforced so far, and thus NLA_NUL_STRING use is the simpler solution. It has a CVSS v3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-63860? +

CVE-2026-63860 has a CVSS v3.1 score of 8.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-63860? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-63860