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CVE-2025-40320

Updated on 08 Dec 2025

Severity

7.0 High severity

Details

CVSS score
7.0
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential cfid UAF in smb2_query_info_compound When smb2_query_info_compound() retries, a previously allocated cfid may have been freed in the first attempt. Because cfid wasn’t reset on replay, later cleanup could act on a stale pointer, leading to a potential use-after-free. Reinitialize cfid to NULL under the replay label. Example trace (trimmed): refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 11224 at ../lib/refcount.c:28 refcount_warn_saturate+0x9c/0x110 […] RIP: 0010:refcount_warn_saturate+0x9c/0x110 […] Call Trace: <TASK> smb2_query_info_compound+0x29c/0x5c0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? step_into+0x10d/0x690 ? __legitimize_path+0x28/0x60 smb2_queryfs+0x6a/0xf0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] smb311_queryfs+0x12d/0x140 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? kmem_cache_alloc+0x18a/0x340 ? getname_flags+0x46/0x1e0 cifs_statfs+0x9f/0x2b0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] statfs_by_dentry+0x67/0x90 vfs_statfs+0x16/0xd0 user_statfs+0x54/0xa0 __do_sys_statfs+0x20/0x50 do_syscall_64+0x58/0x80

Details

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 10 Released
21 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.28.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.31.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.33.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.38.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.42.1.el10_0
  • 6.12.0-55.43.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
Debian 13 Will Not Fix —
Oracle Linux 10 Released
22 kernels
  • 6.12.0-55.27.1.0.1.el10_0
  • 6.12.0-55.28.1.0.1.el10_0
  • 6.12.0-55.29.1.0.1.el10_0
  • 6.12.0-55.30.1.0.1.el10_0
  • 6.12.0-55.31.1.0.1.el10_0
  • 6.12.0-55.32.1.0.1.el10_0
  • 6.12.0-55.33.1.0.1.el10_0
  • 6.12.0-55.34.1.0.1.el10_0
  • 6.12.0-55.37.1.0.1.el10_0
  • 6.12.0-55.38.1.0.1.el10_0
  • 6.12.0-55.39.1.0.1.el10_0
  • 6.12.0-55.40.1.0.1.el10_0
  • 6.12.0-55.41.1.0.1.el10_0
  • 6.12.0-55.42.1.0.1.el10_0
  • 6.12.0-55.43.1.0.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
RHEL 10 Released
24 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.28.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.31.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.33.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.38.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.41.1.el10_0
  • 6.12.0-55.42.1.el10_0
  • 6.12.0-55.43.1.el10_0
  • 6.12.0-124.9.1.el10_1
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.11.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
Rocky Linux 10 Released
16 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.41.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
Ubuntu 24.04 Released
39 kernels
  • 6.8.0-35.35
  • 6.8.0-38.38
  • 6.8.0-36.36
  • 6.8.0-39.39
  • 6.8.0-40.40
  • 6.8.0-41.41
  • 6.8.0-44.44
  • 6.8.0-45.45
  • 6.8.0-31.31
  • 6.8.0-47.47
  • 6.8.0-48.48
  • 6.8.0-49.49
  • 6.8.0-50.51
  • 6.8.0-51.52
  • 6.8.0-52.53
  • 6.8.0-54.56
  • 6.8.0-55.57
  • 6.8.0-53.55
  • 6.8.0-56.58
  • 6.8.0-57.59
  • 6.8.0-58.60
  • 6.8.0-59.61
  • 6.8.0-60.63
  • 6.8.0-62.65
  • 6.8.0-63.66
  • 6.8.0-64.67
  • 6.8.0-71.71
  • 6.8.0-78.78
  • 6.8.0-79.79
  • 6.8.0-84.84
  • 6.8.0-85.85
  • 6.8.0-83.83
  • 6.8.0-86.87
  • 6.8.0-87.88
  • 6.8.0-88.89
  • 6.8.0-90.91
  • 6.8.0-94.96
  • 6.8.0-100.100
  • 6.8.0-101.101
Ubuntu 24.04 AWS Planned —