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CVE-2026-74399

UnknownEPSS 0.17%

Last modified

CVE-2026-74399 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: evm: terminate and bound the evm_xattrs read buffer evm_read_xattrs() allocates size + 1 bytes, fills them from the list of enabled xattrs, and then passes strlen(temp) to simple_read_from_buffer(). When no configured xattrs are enabled, the fill loop stores nothing and temp[0] remains uninitialized, so strlen() reads beyond initialized memory. Explicitly terminate the buffer after allocation, use snprintf() for each formatted line, and pass the accumulated length, without risk of truncation, to simple_read_from_buffer().. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: evm: terminate and bound the evm_xattrs read buffer evm_read_xattrs() allocates size + 1 bytes, fills them from the list of enabled xattrs, and then passes strlen(temp) to simple_read_from_buffer(). When no configured xattrs are enabled, the fill loop stores nothing and temp[0] remains uninitialized, so strlen() reads beyond initialized memory. Explicitly terminate the buffer after allocation, use snprintf() for each formatted line, and pass the accumulated length, without risk of truncation, to simple_read_from_buffer().

Metrics

EPSS Probability
0.17%

7.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 8df81954d22a653a8b01d46692cd56f71137269b; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 0b9f8282b40af4a99d6243d2cb939d14ff36b049; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < a36cbfb85f26e6c6fb6529b1a364331b94dc88f3; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 12ad52dc45a0c8c9d25e85b4a84201de4c5420ed; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 38b7d63b23aa9d2ddde7688040e9426d32be4065; >= fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 11143a19f5b8dc8f414deab87571134f9f447313
LinuxLinux4.18

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74399?
In the Linux kernel, the following vulnerability has been resolved: evm: terminate and bound the evm_xattrs read buffer evm_read_xattrs() allocates size + 1 bytes, fills them from the list of enabled xattrs, and then passes strlen(temp) to simple_read_from_buffer(). When no configured xattrs are enabled, the fill loop stores nothing and temp[0] remains uninitialized, so strlen() reads beyond initialized memory. Explicitly terminate the buffer after allocation, use snprintf() for each formatted line, and pass the accumulated length, without risk of truncation, to simple_read_from_buffer().
How severe is CVE-2026-74399?
Severity scoring for CVE-2026-74399 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74399?
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