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)…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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*
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.19% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-667
- Affected
- debian/debian linux · linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/99f476e27aad5964ab13777d84fda67d1356dec1Patch
- https://git.kernel.org/stable/c/9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29Patch
- https://git.kernel.org/stable/c/b9bb9607b1fc12fca51f5632da25b36975f599bfPatch
- https://git.kernel.org/stable/c/c1a5962f1462b64fe7b69f20a4b6af8067bc2d26Patch
- https://git.kernel.org/stable/c/ce49569079a9d4cad26c0f1d4653382fd9a5ca7aPatch
- https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7Patch
- https://git.kernel.org/stable/c/9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29Patch
- https://git.kernel.org/stable/c/b9bb9607b1fc12fca51f5632da25b36975f599bfPatch
- https://git.kernel.org/stable/c/c1a5962f1462b64fe7b69f20a4b6af8067bc2d26Patch
- https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7Patch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.