Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix heap overflow in cifs_do_set_acl() cifs_set_acl() validates ACL size using posix_acl_xattr_size(): 4 + (count * 8) // 4-byte header + 8 bytes per ACE cifs_do_set_acl() then calls posix_acl_to_cifs() to write the CIFS wire format into the same buffer: 6 + (count * 10) // 6-byte header + 10 bytes per ACE An ACL that passes the xattr-based check in cifs_set_acl() can overflow the heap when posix_acl_to_cifs() writes the larger CIFS format. Validate the CIFS format size against the remaining buffer space and USHRT_MAX before converting--data_count is __u16, so sizes above USHRT_MAX truncate the on-wire packet length, causing the server to apply a partial ACL. Replace MaxDataCount = 1000 with min(CIFSMaxBufSize, USHRT_MAX).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
dc1af4c4b4721abfa07b351063825acc7e69cc66 to < d96f3365ce61c5f39602955af43c8174548dee98affecteddc1af4c4b4721abfa07b351063825acc7e69cc66 to < 596b4062e6c75bdd85a7f2b7f2087a872dc420acaffecteddc1af4c4b4721abfa07b351063825acc7e69cc66 to < 1dac61e2c29d1a71784604b48cf3b1234a65ec29affected
Linux Linux
Default version status: affected
6.2affected0 to < 6.2unaffected6.18.59 to ≤ 6.18.*unaffected7.2.13 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected