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
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.6 | 6.6.3 |
| linux / linux_kernel | 6.2 | 6.5.13 |
| debian / debian_linux | 11.0 | 11.0.x |
| linux / linux_kernel | - | 5.10.237 |
| linux / linux_kernel | 5.11 | 5.15.181 |
| linux / linux_kernel | 5.16 | 6.1.64 |
- https://git.kernel.org/stable/c/99f476e27aad5964ab13777d84fda67d1356dec1
- 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/ce49569079a9d4cad26c0f1d4653382fd9a5ca7a
- https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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