PT-2024-11362 · Linux+2 · Linux Kernel+2
Marc Dionne
·
Published
2021-09-01
·
Updated
2025-05-12
·
CVE-2021-47365
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to a page leak in the Linux kernel, specifically in the
afs extend writeback() function. This function has a loop that adds extra pages to a write to improve efficiency, but it stops if a page cannot be written back immediately, without releasing the speculatively acquired page reference. The leak occurs because the cleanup loop was removed when the code switched from using find get pages contig() to xarray scanning. The issue was found by the generic/074 test and leaks approximately 4GiB of RAM each time it is run, which can be observed using "top".Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Suse