In the Linux kernel, the following vulnerability has been resolved:
NFSD: Fix READDIR buffer overflow
If a client sends a READDIR count argument that is too small (say,
zero), then the buffer size calculation in the new init_dirlist
helper functions results in an underflow, allowing the XDR stream
functions to write beyond the actual buffer.
This calculation has always been suspect. NFSD has never sanity-
checked the READDIR count argument, but the old entry encoders
managed the problem correctly.
With the commits below, entry encoding changed, exposing the
underflow to the pointer arithmetic in xdr_reserve_space().
Modern NFS clients attempt to retrieve as much data as possible
for each READDIR request. Also, we have no unit tests that
exercise the behavior of READDIR at the lower bound of @count
values. Thus this case was missed during testing.
References
| Link | Resource |
|---|---|
| https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72 | Exploit Mailing List Patch |
| https://git.kernel.org/stable/c/9e291a6a28d32545ed2fd959a8165144d1724df1 | Exploit Mailing List Patch |
| https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885 | Exploit Mailing List Patch |
| https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72 | Exploit Mailing List Patch |
| https://git.kernel.org/stable/c/9e291a6a28d32545ed2fd959a8165144d1724df1 | Exploit Mailing List Patch |
| https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885 | Exploit Mailing List Patch |
Configurations
Configuration 1 (hide)
|
History
14 Feb 2025, 15:22
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-120 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| References | () https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72 - Exploit, Mailing List, Patch | |
| References | () https://git.kernel.org/stable/c/9e291a6a28d32545ed2fd959a8165144d1724df1 - Exploit, Mailing List, Patch | |
| References | () https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885 - Exploit, Mailing List, Patch |
Information
Published : 2024-03-04 19:15
Updated : 2025-02-14 15:22
NVD link : CVE-2021-47107
Mitre link : CVE-2021-47107
CVE.ORG link : CVE-2021-47107
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')