CVE-2026-31612

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate EaNameLength in smb2_get_ea()

smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received.

Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 859f11e1bc81a4d32bb3ceeae54bcd296ac675d3affected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 4b73376feecb3b61172fe5b4ff42bbbb8531669daffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 551dfb15b182abad4600eaf7b37e6eb7000d5b1baffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 3363a770b193f555f29d76ddf4ced3305c0ccf6daffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 243b206bcb5a7137e8bddd57b2eec81e1ebd3859affected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < dfc6878d14acafffbe670bf2576620757a10a3d8affected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 66751841212c2cc196577453c37f7774ff363f02affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0.1 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References