In the Linux kernel, the following vulnerability has been resolved:
afs: Fix page leak
There's a loop in afs_extend_writeback() that adds extra pages to a write
we want to make to improve the efficiency of the writeback by making it
larger. This loop stops, however, if we hit a page we can't write back
from immediately, but it doesn't get rid of the page ref we speculatively
acquired.
This was caused by the removal of the cleanup loop when the code switched
from using find_get_pages_contig() to xarray scanning as the latter only
gets a single page at a time, not a batch.
Fix this by putting the page on a ref on an early break from the loop.
Unfortunately, we can't just add that page to the pagevec we're employing
as we'll go through that and add those pages to the RPC call.
This was found by the generic/074 test. It leaks ~4GiB of RAM each time it
is run - which can be observed with "top".
References
Configurations
Configuration 1 (hide)
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History
12 May 2025, 19:54
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/581b2027af0018944ba301d68e7af45c6d1128b5 - Patch | |
| References | () https://git.kernel.org/stable/c/d130b5fdd42254d92948d06347940276140c927e - Patch | |
| CWE | CWE-459 | |
| CPE | cpe:2.3:o:linux:linux_kernel:5.14.9:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
Information
Published : 2024-05-21 15:15
Updated : 2025-05-12 19:54
NVD link : CVE-2021-47365
Mitre link : CVE-2021-47365
CVE.ORG link : CVE-2021-47365
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-459
Incomplete Cleanup