Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix overflow in dacloffset bounds check The dacloffset field was originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl(). This could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer. This patch converts dacloffset to unsigned int and uses check_add_overflow() to validate access to the DACL.

Affected versions

Linux: 0626e6641f6b467447c81dd7678a69c66f7746cf through before abbb4ec41867f2cd1c971258e493893bf43bcbd3 (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before 8483d7b532be1d1bc149556a2fedf903868c6303 (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before 73f074fb5e139cd42ad75089abe4e28a49a30003 (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before 6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before 6b8d379048b168a0dff5ab1acb975b933f368514 (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before 443b373a4df5a2cb9f7b8c4658b2afedeb16397f (git); 0626e6641f6b467447c81dd7678a69c66f7746cf through before beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42 (git); 5.15 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.