UBUNTU-CVE-2023-52757
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential deadlock when releasing mids All release_mid() callers seem to hold a reference of @mid so there is no need to call kref_put(&mid->refcount, __release_mid) under @server->mid_lock spinlock. If they don't, then an use-after-free bug would have occurred anyways. By getting rid of such spinlock also fixes a potential deadlock as shown below CPU 0 CPU 1 ------------------------------------------------------------------ cifs_demultiplex_thread() cifs_debug_data_proc_show() release_mid() spin_lock(&server->mid_lock); spin_lock(&cifs_tcp_ses_lock) spin_lock(&server->mid_lock) __release_mid() smb2_find_smb_tcon() spin_lock(&cifs_tcp_ses_lock) *deadlock*
02 / AFFECTED SOFTWARE
Affected packages
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13 explicit affected versions
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107 explicit affected versions
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10 explicit affected versions
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3 explicit affected versions
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56 explicit affected versions
111 explicit affected versions
59 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential deadlock when releasing mids All release_mid() callers seem to hold a reference of @mid so there is no need to call kref_put(&mid->refcount, __release_mid) under @server->mid_lock spinlock. If they don't, then an use-after-free bug would have occurred anyways. By getting rid of such spinlock also fixes a potential deadlock as shown below CPU 0 CPU 1 ------------------------------------------------------------------ cifs_demultiplex_thread() cifs_debug_data_proc_show() release_mid() spin_lock(&server->mid_lock); spin_lock(&cifs_tcp_ses_lock) spin_lock(&server->mid_lock) __release_mid() smb2_find_smb_tcon() spin_lock(&cifs_tcp_ses_lock) *deadlock*
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7
- https://git.kernel.org/stable/c/9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29
- https://git.kernel.org/stable/c/b9bb9607b1fc12fca51f5632da25b36975f599bf
- https://git.kernel.org/stable/c/c1a5962f1462b64fe7b69f20a4b6af8067bc2d26
- https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7
- https://ubuntu.com/security/CVE-2023-52757
- https://ubuntu.com/security/notices/USN-7123-1
- https://ubuntu.com/security/notices/USN-7194-1
- https://ubuntu.com/security/notices/USN-7654-1
- https://ubuntu.com/security/notices/USN-7654-2
- https://ubuntu.com/security/notices/USN-7654-3
- https://ubuntu.com/security/notices/USN-7654-4
- https://ubuntu.com/security/notices/USN-7654-5
- https://ubuntu.com/security/notices/USN-7655-1
- https://ubuntu.com/security/notices/USN-7685-1
- https://ubuntu.com/security/notices/USN-7685-2
- https://ubuntu.com/security/notices/USN-7685-3
- https://ubuntu.com/security/notices/USN-7685-4
- https://ubuntu.com/security/notices/USN-7685-5
- https://ubuntu.com/security/notices/USN-7686-1
- https://ubuntu.com/security/notices/USN-7701-1
- https://ubuntu.com/security/notices/USN-7701-2
- https://ubuntu.com/security/notices/USN-7701-3
- https://ubuntu.com/security/notices/USN-7819-1
- https://ubuntu.com/security/notices/USN-7819-2
- https://ubuntu.com/security/notices/USN-7832-1
- https://www.cve.org/CVERecord?id=CVE-2023-52757