CVE-2023-52752

Summary

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/DebugData while 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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < 2abdf136784b7edaec7ffe0f4b461b63f9c4c4deaffected
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < 336a066990bb3962c46daf574ace596bda9303ceaffected
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < 558817597d5fbd7af31f891b67b0fd20f0d047b7affected
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < 89929ea46f9cc11ba66d2c64713aa5d5dc723b09affected
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < 0ab6f842452ce2cae04209d4671ac6289d0aef8aaffected
LinuxLinux7f48558e6489d032b1584b0cc9ac4bb11072c034 < d328c09ee9f15ee5a26431f5aad7c9239fa85e62affected
LinuxLinuxa67172a013953664b1dad03c648200c70b90506caffected
LinuxLinux3.12.48 < 3.13affected
LinuxLinux3.13affected
LinuxLinux0 < 3.13unaffected
LinuxLinux5.10.237 <= 5.10.*unaffected
LinuxLinux5.15.181 <= 5.15.*unaffected
LinuxLinux6.1.64 <= 6.1.*unaffected
LinuxLinux6.5.13 <= 6.5.*unaffected
LinuxLinux6.6.3 <= 6.6.*unaffected
LinuxLinux6.7 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

CVE Program Container

Additional References

References