In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)
KASAN reports:
[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)
[ 4.676149][ T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0
[ 4.683454][ T0]
[ 4.685638][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1
[ 4.694331][ T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016
[ 4.703196][ T0] Call Trace:
[ 4.706334][ T0] <TASK>
[ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)
after converting the type of the first argument (@nr, bit number)
of arch_test_bit() from `long` to `unsigned long`[0].
Under certain conditions (for example, when ACPI NUMA is disabled
via command line), pxm_to_node() can return %NUMA_NO_NODE (-1).
It is valid 'magic' number of NUMA node, but not valid bit number
to use in bitops.
node_online() eventually descends to test_bit() without checking
for the input, assuming it's on caller side (which might be good
for perf-critical tasks). There, -1 becomes %ULONG_MAX which leads
to an insane array index when calculating bit position in memory.
For now, add an explicit check for @node being not %NUMA_NO_NODE
before calling test_bit(). The actual logics didn't change here
at all.
[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d
References
Configurations
Configuration 1 (hide)
|
History
18 Nov 2025, 02:44
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/0b4c0003aeda32a600f95df53b2848da8a5aa3fa - Patch | |
| References | () https://git.kernel.org/stable/c/5659efdadf04b56707d58c1b758df16d2e0eff2c - Patch | |
| References | () https://git.kernel.org/stable/c/73ce2046e04ad488cecc66757c36cbe1bdf089d4 - Patch | |
| References | () https://git.kernel.org/stable/c/b0b0b77ea611e3088e9523e60860f4f41b62b235 - Patch | |
| References | () https://git.kernel.org/stable/c/b12304984654d8e58a2b22ff94c4410906d6267f - Patch | |
| References | () https://git.kernel.org/stable/c/c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa - Patch | |
| Summary |
|
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.1 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-125 | |
| First Time |
Linux
Linux linux Kernel |
18 Jun 2025, 11:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-06-18 11:15
Updated : 2025-11-18 02:44
NVD link : CVE-2022-50093
Mitre link : CVE-2022-50093
CVE.ORG link : CVE-2022-50093
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-125
Out-of-bounds Read