CVE-2026-53110
HIGH
Published Jun 24, 2026
Modified Jun 28, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: s390/bpf: Zero-extend bpf prog return values and kfunc arguments s390x ABI requires callers to zero-extend unsigned arguments and sign-extend signed arguments, and callees to zero-extend unsigned return values and sign-extend signed return values. s390 BPF JIT currently implements only sign extension. Fix this omission and implement zero extension too.
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CVSS v3.1 Score
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — Exploit Prediction
0.0012
Probability of exploitation
0.02%
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/202e42e4aa890172366354b233c42c73107a3f59
https://git.kernel.org/stable/c/366b0e05ee24f5ba62bdc7ec1346038258b9a797
https://git.kernel.org/stable/c/44c4f999b03f55debb1a0c5ab5c1796895a1adf8
https://git.kernel.org/stable/c/834918a77be51419383bf1dda9f02b81ecf26b34
https://git.kernel.org/stable/c/edc90a12073b9a530064a99945c183dde120cb99
Frequently Asked Questions
What is CVE-2026-53110? +
In the Linux kernel, the following vulnerability has been resolved:
s390/bpf: Zero-extend bpf prog return values and kfunc arguments
s390x ABI requires callers to zero-extend unsigned arguments and
sign-extend signed arguments, and callees to zero-extend unsigned
return values and sign-extend signed return values.
s390 BPF JIT currently implements only sign extension. Fix this
omission and implement zero extension too. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2026-53110? +
CVE-2026-53110 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-53110? +
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.