CVE-2022-49532: drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes drm_cvt_mode may return NULL and we should check it. This bug is found by syzkaller: FAULT_INJECTION stacktrace: [ 168.567394] FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 [ 168.567403] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1 [ 168.567406] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 168.567408] Call trace: [ 168.567414] dump_backtrace+0x0/0x310 [ 168.567418] show_stack+0x28/0x38 [ 168.567423] dump_stack+0xec/0x15c [ 168.567427] should_fail+0x3ac/0x3d0 [ 168.567437] __should_failslab+0xb8/0x120 [ 168.567441] should_failslab+0x28/0xc0 [ 168.567445] kmem_cache_alloc_trace+0x50/0x640 [ 168.567454] drm_mode_create+0x40/0x90 [ 168.567458] drm_cvt_mode+0x48/0xc78 [ 168.567477] virtio_gpu_conn_get_modes+0xa8/0x140 [virtio_gpu] [ 168.567485] drm_helper_probe_single_connector_modes+0x3a4/0xd80 [ 168.567492] drm_mode_getconnector+0x2e0/0xa70 [ 168.567496] drm_ioctl_kernel+0x11c/0x1d8 [ 168.567514] drm_ioctl+0x558/0x6d0 [ 168.567522] do_vfs_ioctl+0x160/0xf30 [ 168.567525] ksys_ioctl+0x98/0xd8 [ 168.567530] __arm64_sys_ioctl+0x50/0xc8 [ 168.567536] el0_svc_common+0xc8/0x320 [ 168.567540] el0_svc_handler+0xf8/0x160 [ 168.567544] el0_svc+0x10/0x218 KASAN stacktrace: [ 168.567561] BUG: KASAN: null-ptr-deref in virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu] [ 168.567565] Read of size 4 at addr 0000000000000054 by task syz/6425 [ 168.567566] [ 168.567571] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1 [ 168.567573] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 168.567575] Call trace: [ 168.567578] dump_backtrace+0x0/0x310 [ 168.567582] show_stack+0x28/0x38 [ 168.567586] dump_stack+0xec/0x15c [ 168.567591] kasan_report+0x244/0x2f0 [ 168.567594] __asan_load4+0x58/0xb0 [ 168.567607] virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu] [ 168.567612] drm_helper_probe_single_connector_modes+0x3a4/0xd80 [ 168.567617] drm_mode_getconnector+0x2e0/0xa70 [ 168.567621] drm_ioctl_kernel+0x11c/0x1d8 [ 168.567624] drm_ioctl+0x558/0x6d0 [ 168.567628] do_vfs_ioctl+0x160/0xf30 [ 168.567632] ksys_ioctl+0x98/0xd8 [ 168.567636] __arm64_sys_ioctl+0x50/0xc8 [ 168.567641] el0_svc_common+0xc8/0x320 [ 168.567645] el0_svc_handler+0xf8/0x160 [ 168.567649] el0_svc+0x10/0x218
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| <4.9.318 | ||
| >=4.10<4.14.283 | ||
| >=4.15<4.19.247 | ||
| >=4.20<5.4.198 | ||
| >=5.5<5.10.121 | ||
| >=5.11<5.15.46 | ||
| >=5.16<5.17.14 | ||
| >=5.18<5.18.3 |
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Reference Links
- https://git.kernel.org/stable/c/e0828456578cc8ba0a69147f7ae3428392eec287
- https://git.kernel.org/stable/c/848dd072744ea662ab3097e3c8282bee552df218
- https://git.kernel.org/stable/c/edafcad84c4134ebec4bc24b29ca4497a1184eea
- https://git.kernel.org/stable/c/f85cb059fad03a3b33a50023be91e944bb065ae8
- https://git.kernel.org/stable/c/fadc626cae99aaa1325094edc6a9e2b883f3e562
- https://git.kernel.org/stable/c/32e10aabc287f09a148ff759bb9ce70b01b0012c
- https://git.kernel.org/stable/c/c51d00472fa54b9b05c17789ed665c17adf3a25d
- https://git.kernel.org/stable/c/0f8bc147a963686b7351aa35d1701124ffacac08
- https://git.kernel.org/stable/c/194d250cdc4a40ccbd179afd522a9e9846957402
Frequently Asked Questions
What is the severity of CVE-2022-49532?
CVE-2022-49532 has a medium severity rating due to the potential for NULL pointer dereference in the Linux kernel.
How do I fix CVE-2022-49532?
To fix CVE-2022-49532, update the Linux kernel to a version that contains the patch addressing this vulnerability.
What versions of the Linux kernel are affected by CVE-2022-49532?
CVE-2022-49532 affects Linux kernel versions prior to 4.9.318 and multiple versions between 4.10 to 5.18.3.
What causes the vulnerability in CVE-2022-49532?
CVE-2022-49532 is caused by a failure to check for NULL return values in the drm_cvt_mode function within the Linux kernel's virtio GPU.
Can CVE-2022-49532 be exploited remotely?
The specifics of CVE-2022-49532 suggest that exploitation may require local access or specific conditions to be met.
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