# CVE-2022-49532: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/virtio: fix NULL pointer dereference in virt...

CVE-2022-49532 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49532, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49532
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0032
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49532](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49532.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49532](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49532.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49532](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49532.md) | Feb 26, 2025 |

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