CVE-2023-52752 smb: client: fix use-after-free bug in cifs_debug_data_proc_show()
A use-after-free bug in the Linux kernel CIFS client allows a local attacker to cause a system crash by reading debug data during session teardown.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52752?
CVE-2023-52752 is a high-severity use after free vulnerability in Debian Debian Linux, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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
Weakness: CWE-416
Which versions are affected by CVE-2023-52752?
It affects 2 products.
Linux distribution packages (3)
kernel-livepatch-SLE15-SP6-RT_Update_2 SUSE:Linux Enterprise Live Patching 15 SP6 | All versions | 2-150600.1.6.1 |
kernel-livepatch-SLE15-SP6-RT_Update_3 SUSE:Linux Enterprise Live Patching 15 SP6 | All versions | 2-150600.2.1 |
kernel-livepatch-SLE15-SP6_Update_4 SUSE:Linux Enterprise Live Patching 15 SP6 | All versions | 2-150600.13.6.1 |
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2023-52752?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-52752 being exploited?
There is no known exploitation of CVE-2023-52752 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-42208, BELL-CVE-2023-52752, DEBIAN-CVE-2023-52752, GHSA-c3wm-p2jr-8f5g, SUSE-SU-2024:3764-1, SUSE-SU-2024:3775-1 and 2 more.