In the Linux kernel, the following vulnerability has been resolved:smb: client: fix use-after-free bug in cifs_debug_data_proc_show()Skip SMB sessions that are being teared down(e.g. @ses->ses_status == SES_EXITING) in cifs_debug_data_proc_show()to avoid use-after-free in @ses.This fixes the following GPF when reading from /proc/fs/cifs/DebugDatawhile mounting and umounting  [ 816.251274] general protection fault, probably for non-canonical  address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI  ...  [  816.260138] Call Trace:  [  816.260329]  <TASK>  [  816.260499]  ? die_addr+0x36/0x90  [  816.260762]  ? exc_general_protection+0x1b3/0x410  [  816.261126]  ? asm_exc_general_protection+0x26/0x30  [  816.261502]  ? cifs_debug_tcon+0xbd/0x240 [cifs]  [  816.261878]  ? cifs_debug_tcon+0xab/0x240 [cifs]  [  816.262249]  cifs_debug_data_proc_show+0x516/0xdb0 [cifs]  [  816.262689]  ? seq_read_iter+0x379/0x470  [  816.262995]  seq_read_iter+0x118/0x470  [  816.263291]  proc_reg_read_iter+0x53/0x90  [  816.263596]  ? srso_alias_return_thunk+0x5/0x7f  [  816.263945]  vfs_read+0x201/0x350  [  816.264211]  ksys_read+0x75/0x100  [  816.264472]  do_syscall_64+0x3f/0x90  [  816.264750]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8  [  816.265135] RIP: 0033:0x7fd5e669d381
CWE-416 Use After Free