CVE-2026-89989

Summary

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

ima: Check for ERR_PTR from dentry_path() in validate_hash_algo()

dentry_path() returns ERR_PTR(-ENAMETOOLONG) when the path exceeds the buffer. validate_hash_algo() passes the result straight to integrity_audit_msg() without checking. ERR_PTR is not NULL, so integrity_audit_message() sees a valid pointer and calls strlen() on it, which faults:

BUG: unable to handle page fault for address: ffffffffffffffdc
RIP: 0010:strlen+0x30/0xa0
Call Trace:
 audit_log_untrustedstring+0x19/0x30
 integrity_audit_message+0x366/0x4f0
 ima_inode_setxattr+0x512/0x5f0

Check for IS_ERR() and use NULL instead, which makes the audit message skip the name= field instead of crashing.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < d6fade89903c8fd0af6c956242aec8b927040e02affected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < 0de5b525c0cd7d202848b8adfde3c01c287fb1a6affected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < 30b5c0e17dcad72b6b2f987319aa645570e6376daffected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < 9e69d683ebd7def04557fe758ff123105d7d9840affected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < f8a2f2a4602318eb93d49d27fd0d0fdaab17eddeaffected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < d62a84a78de5f29c642fa3bd4eee072ba7289cb4affected
LinuxLinux4f2946aa0c45c78b4f4ef101bab9694e38c68db0 < 8861f6d5c0678a7c5089c7b272509fc5931b8437affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References