In the Linux kernel, the following vulnerability has been resolved:
gfs2: Validate i_depth for exhash directories
A fuzzer test introduced corruption that ends up with a depth of 0 in
dir_e_read(), causing an undefined shift by 32 at:
index = hash >> (32 - dip->i_depth);
As calculated in an open-coded way in dir_make_exhash(), the minimum
depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is
invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time.
So we can avoid the undefined behaviour by checking for depth values
lower than the minimum in gfs2_dinode_in(). Values greater than the
maximum are already being checked for there.
Also switch the calculation in dir_make_exhash() to use ilog2() to
clarify how the depth is calculated.
Tested with the syzkaller repro.c and xfstests '-g quick'.
References
Configurations
Configuration 1 (hide)
|
History
25 Nov 2025, 22:07
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d - Patch | |
| References | () https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b - Patch | |
| References | () https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0 - Patch | |
| References | () https://git.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7 - Patch |
Information
Published : 2025-09-04 16:15
Updated : 2025-11-25 22:07
NVD link : CVE-2025-38710
Mitre link : CVE-2025-38710
CVE.ORG link : CVE-2025-38710
JSON object : View
Products Affected
linux
- linux_kernel
CWE