| CVE-2021-47259 | Date: (C)2024-05-22 (M)2024-06-07 |
In the Linux kernel, the following vulnerability has been resolved:
NFS: Fix use-after-free in nfs4_init_client()
KASAN reports a use-after-free when attempting to mount two different
exports through two different NICs that belong to the same server.
Olga was able to hit this with kernels starting somewhere between 5.7
and 5.10, but I traced the patch that introduced the clear_bit() call to
4.13. So something must have changed in the refcounting of the clp
pointer to make this call to nfs_put_client() the very last one.
CVSS Score and Metrics +CVSS Score and Metrics -| CVSS V3 Severity: | CVSS V2 Severity: |
| CVSS Score : 8.4 | CVSS Score : |
| Exploit Score: | Exploit Score: |
| Impact Score: | Impact Score: |
| |
| CVSS V3 Metrics: | CVSS V2 Metrics: |
| Attack Vector: | Access Vector: |
| Attack Complexity: | Access Complexity: |
| Privileges Required: | Authentication: |
| User Interaction: | Confidentiality: |
| Scope: | Integrity: |
| Confidentiality: | Availability: |
| Integrity: | |
| Availability: | |
| | |
