Jianhong Yin

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 6.12.0 **Description** A NULL pointer dereference issue has been identified in the Linux kernel, specifically in the `crypto aead setkey()` function. This issue arises when the `SMB2 GLOBAL CAP ENCRYPTION` flag is set in the negotiate response, and the client uses AES-128-CCM as the default cipher. The problem occurs because the `@server->cipher type` check is always false for SMB3.02, leading to a null pointer dereference. The estimated number of potentially affected devices worldwide is not specified. Technical details about exploitation include: - The vulnerable function is `crypto aead setkey()`. - The `smb3 init transform rq()` function is involved in the call trace. - The `SMB2 GLOBAL CAP ENCRYPTION` flag is set in the negotiate response. - The client uses AES-128-CCM as the default cipher. **Recommendations** To resolve this issue, update the Linux kernel to a version that includes the fix for this vulnerability. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 20798dfe249a **Description** A NULL dereference vulnerability has been resolved in the Linux kernel. The issue occurs in the nfsd component, specifically in the nfs3svc encode getaclres function, where the dentry may be NULL in error cases. The encoder previously checked the dentry and d really is positive(dentry), but this was considered overkill, as a zero status should be enough to guarantee a positive dentry. This is not the first instance of an error-case NULL dereference hidden in the initialization of a local variable in an xdr encoder. **Recommendations** As a temporary workaround, consider disabling the `nfs3svc encode getaclres` function until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.