Severity
Details
- CVSS score
- 7.8
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overview
About vulnerability
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
Details
- Affected product:
- AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 6 ELS , CloudLinux 7 ELS , Debian 10 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- linux-meta @ 4.15.0 (+20 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| AlmaLinux 9 | Released |
19 kernels
|
| Amazon Linux 2023 | Planned | — |
| Debian 11 | Released |
34 kernels
|
| Debian 11 cloud | Released |
14 kernels
|
| Oracle Linux 8 UEK 7 | Released |
67 kernels
|
| Oracle Linux 9 | Released |
23 kernels
|
| Oracle Linux 9 UEK 7 | Released |
67 kernels
|
| Proxmox VE 7 5.15 | Released |
47 kernels
|
| RHEL 9 | Released |
18 kernels
|
| Rocky Linux 9 | Released |
21 kernels
|
| Ubuntu 16.04 AWS HWE ESM | Will Not Fix | — |
| Ubuntu 16.04 Azure ESM | Will Not Fix | — |
| Ubuntu 16.04 GCP ESM | Will Not Fix | — |
| Ubuntu 16.04 HWE ESM | Will Not Fix | — |
| Ubuntu 18.04 | Planned | — |
| Ubuntu 18.04 AWS Focal | Released |
56 kernels
|
| Ubuntu 18.04 HWE Focal | Released |
69 kernels
|
| Ubuntu 20.04 | Released |
127 kernels
|
| Ubuntu 20.04 AWS | Released |
109 kernels
|
| Ubuntu 20.04 Azure | Released |
100 kernels
|
| Ubuntu 20.04 GCP | Ready For Release | — |
| Ubuntu 20.04 HWE AWS | Released |
57 kernels
|
| Ubuntu 20.04 HWE Azure | Released |
30 kernels
|
| Ubuntu 22.04 | Released |
77 kernels
|
| Ubuntu 22.04 AWS | Released |
68 kernels
|
| Ubuntu 22.04 Azure | Released |
51 kernels
|