drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes

{
  "id": "3a0b32bf7ceb839a1cabcbd1a57f90ee72d235abc13dd99920ba5480a3e15804",
  "url": "https://osv.dev/vulnerability/CVE-2022-49532",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes",
    "summary": "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",
    "evidence": "osv:CVE-2022-49532",
    "products": [
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        "name": {
          "value": "Kernel",
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        "prerequisites": [],
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      "modified": "2026-10-28T02:30:42.795617323Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0f8bc147a963686b7351aa35d1701124ffacac08",
        "https://git.kernel.org/stable/c/194d250cdc4a40ccbd179afd522a9e9846957402",
        "https://git.kernel.org/stable/c/32e10aabc287f09a148ff759bb9ce70b01b0012c",
        "https://git.kernel.org/stable/c/848dd072744ea662ab3097e3c8282bee552df218",
        "https://git.kernel.org/stable/c/c51d00472fa54b9b05c17789ed665c17adf3a25d",
        "https://git.kernel.org/stable/c/e0828456578cc8ba0a69147f7ae3428392eec287",
        "https://git.kernel.org/stable/c/edafcad84c4134ebec4bc24b29ca4497a1184eea",
        "https://git.kernel.org/stable/c/f85cb059fad03a3b33a50023be91e944bb065ae8",
        "https://git.kernel.org/stable/c/fadc626cae99aaa1325094edc6a9e2b883f3e562",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49532.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49532",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 510221,
  "published_at": "2025-02-26T02:13:52.013+00:00"
}