CVE-2026-74399

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < 8df81954d22a653a8b01d46692cd56f71137269baffected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < 0b9f8282b40af4a99d6243d2cb939d14ff36b049affected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < a36cbfb85f26e6c6fb6529b1a364331b94dc88f3affected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < 12ad52dc45a0c8c9d25e85b4a84201de4c5420edaffected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39daffected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < 38b7d63b23aa9d2ddde7688040e9426d32be4065affected
LinuxLinuxfa516b66a1bfce1d72f1620c54bdfebc493000d1 < 11143a19f5b8dc8f414deab87571134f9f447313affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References