CVE-2023-52752: smb: client: fix use-after-free bug in cifs_debug_data_proc_show()
First published: Tue May 21 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <6.1.64 | |
| Linux kernel | >=6.2<6.5.13 | |
| Linux kernel | >=6.6<6.6.3 | |
| Linux Kernel | <6.1.64 | |
| Linux Kernel | >=6.2<6.5.13 | |
| Linux Kernel | >=6.6<6.6.3 | |
| debian/linux | <=5.10.223-1<=5.10.234-1 | 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/0ab6f842452ce2cae04209d4671ac6289d0aef8a
- https://git.kernel.org/stable/c/558817597d5fbd7af31f891b67b0fd20f0d047b7
- https://git.kernel.org/stable/c/89929ea46f9cc11ba66d2c64713aa5d5dc723b09
- https://git.kernel.org/stable/c/d328c09ee9f15ee5a26431f5aad7c9239fa85e62
- https://launchpad.net/bugs/cve/CVE-2023-52752
- https://git.kernel.org/linus/d328c09ee9f15ee5a26431f5aad7c9239fa85e62
- https://security-tracker.debian.org/tracker/CVE-2023-52752
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52752
- https://nvd.nist.gov/vuln/detail/CVE-2023-52752
- https://ubuntu.com/security/CVE-2023-52752
Frequently Asked Questions
What is the severity of CVE-2023-52752?
CVE-2023-52752 has been rated as a high severity vulnerability due to the potential for use-after-free conditions in the Linux kernel.
How do I fix CVE-2023-52752?
To fix CVE-2023-52752, update your Linux kernel to versions 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.13-1.
Which versions of the Linux kernel are affected by CVE-2023-52752?
CVE-2023-52752 affects Linux kernel versions earlier than 6.1.64 and those in the ranges 6.2 to 6.5.13 and 6.6 to 6.6.3.
What components are involved in CVE-2023-52752?
CVE-2023-52752 involves the CIFS (Common Internet File System) client within the Linux kernel.
Is there a workaround for CVE-2023-52752?
There is no official workaround for CVE-2023-52752, therefore updating to a fixed version is recommended.
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