In the Linux kernel, the following vulnerability has been resolved:
mm: zswap: fix shrinker NULL crash with cgroup_disable=memory
Christian reports a NULL deref in zswap that he bisected down to the zswap
shrinker. The issue also cropped up in the bug trackers of libguestfs [1]
and the Red Hat bugzilla [2].
The problem is that when memcg is disabled with the boot time flag, the
zswap shrinker might get called with sc->memcg == NULL. This is okay in
many places, like the lruvec operations. But it crashes in
memcg_page_state() - which is only used due to the non-node accounting of
cgroup's the zswap memory to begin with.
Nhat spotted that the memcg can be NULL in the memcg-disabled case, and I
was then able to reproduce the crash locally as well.
[1] https://github.com/libguestfs/libguestfs/issues/139
[2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252
References
Configurations
Configuration 1 (hide)
|
History
30 Dec 2024, 17:39
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-476 | |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1 - Patch | |
| References | () https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
Information
Published : 2024-05-17 15:15
Updated : 2024-12-30 17:39
NVD link : CVE-2024-35846
Mitre link : CVE-2024-35846
CVE.ORG link : CVE-2024-35846
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference