vulnerability
Debian: CVE-2021-47649: linux -- security update
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:L/AC:L/Au:S/C:N/I:C/A:C) | Feb 27, 2025 | Feb 27, 2025 | Feb 28, 2025 |
Severity
6
CVSS
(AV:L/AC:L/Au:S/C:N/I:C/A:C)
Published
Feb 27, 2025
Added
Feb 27, 2025
Modified
Feb 28, 2025
Description
In the Linux kernel, the following vulnerability has been resolved:
udmabuf: validate ubuf->pagecount
Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The
problem was in ubuf->pages == ZERO_PTR.
ubuf->pagecount is calculated from arguments passed from user-space. If
user creates udmabuf with list.size == 0 then ubuf->pagecount will be
also equal to zero; it causes kmalloc_array() to return ZERO_PTR.
Fix it by validating ubuf->pagecount before passing it to
kmalloc_array().
Solution
debian-upgrade-linux
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