CVE-2026-93811

Summary

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

ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

  1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths.

  2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8f0541186e9ad1b62accc9519cc2b7a7240272a7 < c3836f55e0dab96314774215e12d87f63fa919f2affected
LinuxLinux8f0541186e9ad1b62accc9519cc2b7a7240272a7 < 6e6329322ad733c5b23555c609353841560b26bcaffected
LinuxLinux8f0541186e9ad1b62accc9519cc2b7a7240272a7 < d708a36634bb7b6f94d0e76d587d2ec50b2b93b5affected
LinuxLinuxcb69d4d6f709f87c94afa28ae64c501576692171affected
LinuxLinux6e8f4abf584253cbaa596ea4ad13110cf61cd4c9affected
LinuxLinux8e33102309bd6839b2e2e158f93a7b378cb4655daffected
LinuxLinux5.15.62 < 5.16affected
LinuxLinux5.18.18 < 5.19affected
LinuxLinux5.19.2 < 5.20affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References