ghsa-wrx3-9hcj-fp9v
Vulnerability from github
Published
2025-12-30 15:30
Modified
2025-12-30 15:30
Details

In the Linux kernel, the following vulnerability has been resolved:

MIPS: KVM: Fix NULL pointer dereference

After commit 45c7e8af4a5e3f0bea4ac209 ("MIPS: Remove KVM_TE support") we get a NULL pointer dereference when creating a KVM guest:

[ 146.243409] Starting KVM with MIPS VZ extensions [ 149.849151] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000300, epc == ffffffffc06356ec, ra == ffffffffc063568c [ 149.849177] Oops[#1]: [ 149.849182] CPU: 3 PID: 2265 Comm: qemu-system-mip Not tainted 6.4.0-rc3+ #1671 [ 149.849188] Hardware name: THTF CX TL630 Series/THTF-LS3A4000-7A1000-ML4A, BIOS KL4.1F.TF.D.166.201225.R 12/25/2020 [ 149.849192] $ 0 : 0000000000000000 000000007400cce0 0000000000400004 ffffffff8119c740 [ 149.849209] $ 4 : 000000007400cce1 000000007400cce1 0000000000000000 0000000000000000 [ 149.849221] $ 8 : 000000240058bb36 ffffffff81421ac0 0000000000000000 0000000000400dc0 [ 149.849233] $12 : 9800000102a07cc8 ffffffff80e40e38 0000000000000001 0000000000400dc0 [ 149.849245] $16 : 0000000000000000 9800000106cd0000 9800000106cd0000 9800000100cce000 [ 149.849257] $20 : ffffffffc0632b28 ffffffffc05b31b0 9800000100ccca00 0000000000400000 [ 149.849269] $24 : 9800000106cd09ce ffffffff802f69d0 [ 149.849281] $28 : 9800000102a04000 9800000102a07cd0 98000001106a8000 ffffffffc063568c [ 149.849293] Hi : 00000335b2111e66 [ 149.849295] Lo : 6668d90061ae0ae9 [ 149.849298] epc : ffffffffc06356ec kvm_vz_vcpu_setup+0xc4/0x328 [kvm] [ 149.849324] ra : ffffffffc063568c kvm_vz_vcpu_setup+0x64/0x328 [kvm] [ 149.849336] Status: 7400cce3 KX SX UX KERNEL EXL IE [ 149.849351] Cause : 1000000c (ExcCode 03) [ 149.849354] BadVA : 0000000000000300 [ 149.849357] PrId : 0014c004 (ICT Loongson-3) [ 149.849360] Modules linked in: kvm nfnetlink_queue nfnetlink_log nfnetlink fuse sha256_generic libsha256 cfg80211 rfkill binfmt_misc vfat fat snd_hda_codec_hdmi input_leds led_class snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_pcm snd_timer snd serio_raw xhci_pci radeon drm_suballoc_helper drm_display_helper xhci_hcd ip_tables x_tables [ 149.849432] Process qemu-system-mip (pid: 2265, threadinfo=00000000ae2982d2, task=0000000038e09ad4, tls=000000ffeba16030) [ 149.849439] Stack : 9800000000000003 9800000100ccca00 9800000100ccc000 ffffffffc062cef4 [ 149.849453] 9800000102a07d18 c89b63a7ab338e00 0000000000000000 ffffffff811a0000 [ 149.849465] 0000000000000000 9800000106cd0000 ffffffff80e59938 98000001106a8920 [ 149.849476] ffffffff80e57f30 ffffffffc062854c ffffffff811a0000 9800000102bf4240 [ 149.849488] ffffffffc05b0000 ffffffff80e3a798 000000ff78000000 000000ff78000010 [ 149.849500] 0000000000000255 98000001021f7de0 98000001023f0078 ffffffff81434000 [ 149.849511] 0000000000000000 0000000000000000 9800000102ae0000 980000025e92ae28 [ 149.849523] 0000000000000000 c89b63a7ab338e00 0000000000000001 ffffffff8119dce0 [ 149.849535] 000000ff78000010 ffffffff804f3d3c 9800000102a07eb0 0000000000000255 [ 149.849546] 0000000000000000 ffffffff8049460c 000000ff78000010 0000000000000255 [ 149.849558] ... [ 149.849565] Call Trace: [ 149.849567] [] kvm_vz_vcpu_setup+0xc4/0x328 [kvm] [ 149.849586] [] kvm_arch_vcpu_create+0x184/0x228 [kvm] [ 149.849605] [] kvm_vm_ioctl+0x64c/0xf28 [kvm] [ 149.849623] [] sys_ioctl+0xc8/0x118 [ 149.849631] [] syscall_common+0x34/0x58

The root cause is the deletion of kvm_mips_commpage_init() leaves vcpu ->arch.cop0 NULL. So fix it by making cop0 from a pointer to an embedded object.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2023-54241"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-30T13:16:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: KVM: Fix NULL pointer dereference\n\nAfter commit 45c7e8af4a5e3f0bea4ac209 (\"MIPS: Remove KVM_TE support\") we\nget a NULL pointer dereference when creating a KVM guest:\n\n[  146.243409] Starting KVM with MIPS VZ extensions\n[  149.849151] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000300, epc == ffffffffc06356ec, ra == ffffffffc063568c\n[  149.849177] Oops[#1]:\n[  149.849182] CPU: 3 PID: 2265 Comm: qemu-system-mip Not tainted 6.4.0-rc3+ #1671\n[  149.849188] Hardware name: THTF CX TL630 Series/THTF-LS3A4000-7A1000-ML4A, BIOS KL4.1F.TF.D.166.201225.R 12/25/2020\n[  149.849192] $ 0   : 0000000000000000 000000007400cce0 0000000000400004 ffffffff8119c740\n[  149.849209] $ 4   : 000000007400cce1 000000007400cce1 0000000000000000 0000000000000000\n[  149.849221] $ 8   : 000000240058bb36 ffffffff81421ac0 0000000000000000 0000000000400dc0\n[  149.849233] $12   : 9800000102a07cc8 ffffffff80e40e38 0000000000000001 0000000000400dc0\n[  149.849245] $16   : 0000000000000000 9800000106cd0000 9800000106cd0000 9800000100cce000\n[  149.849257] $20   : ffffffffc0632b28 ffffffffc05b31b0 9800000100ccca00 0000000000400000\n[  149.849269] $24   : 9800000106cd09ce ffffffff802f69d0\n[  149.849281] $28   : 9800000102a04000 9800000102a07cd0 98000001106a8000 ffffffffc063568c\n[  149.849293] Hi    : 00000335b2111e66\n[  149.849295] Lo    : 6668d90061ae0ae9\n[  149.849298] epc   : ffffffffc06356ec kvm_vz_vcpu_setup+0xc4/0x328 [kvm]\n[  149.849324] ra    : ffffffffc063568c kvm_vz_vcpu_setup+0x64/0x328 [kvm]\n[  149.849336] Status: 7400cce3 KX SX UX KERNEL EXL IE\n[  149.849351] Cause : 1000000c (ExcCode 03)\n[  149.849354] BadVA : 0000000000000300\n[  149.849357] PrId  : 0014c004 (ICT Loongson-3)\n[  149.849360] Modules linked in: kvm nfnetlink_queue nfnetlink_log nfnetlink fuse sha256_generic libsha256 cfg80211 rfkill binfmt_misc vfat fat snd_hda_codec_hdmi input_leds led_class snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_pcm snd_timer snd serio_raw xhci_pci radeon drm_suballoc_helper drm_display_helper xhci_hcd ip_tables x_tables\n[  149.849432] Process qemu-system-mip (pid: 2265, threadinfo=00000000ae2982d2, task=0000000038e09ad4, tls=000000ffeba16030)\n[  149.849439] Stack : 9800000000000003 9800000100ccca00 9800000100ccc000 ffffffffc062cef4\n[  149.849453]         9800000102a07d18 c89b63a7ab338e00 0000000000000000 ffffffff811a0000\n[  149.849465]         0000000000000000 9800000106cd0000 ffffffff80e59938 98000001106a8920\n[  149.849476]         ffffffff80e57f30 ffffffffc062854c ffffffff811a0000 9800000102bf4240\n[  149.849488]         ffffffffc05b0000 ffffffff80e3a798 000000ff78000000 000000ff78000010\n[  149.849500]         0000000000000255 98000001021f7de0 98000001023f0078 ffffffff81434000\n[  149.849511]         0000000000000000 0000000000000000 9800000102ae0000 980000025e92ae28\n[  149.849523]         0000000000000000 c89b63a7ab338e00 0000000000000001 ffffffff8119dce0\n[  149.849535]         000000ff78000010 ffffffff804f3d3c 9800000102a07eb0 0000000000000255\n[  149.849546]         0000000000000000 ffffffff8049460c 000000ff78000010 0000000000000255\n[  149.849558]         ...\n[  149.849565] Call Trace:\n[  149.849567] [\u003cffffffffc06356ec\u003e] kvm_vz_vcpu_setup+0xc4/0x328 [kvm]\n[  149.849586] [\u003cffffffffc062cef4\u003e] kvm_arch_vcpu_create+0x184/0x228 [kvm]\n[  149.849605] [\u003cffffffffc062854c\u003e] kvm_vm_ioctl+0x64c/0xf28 [kvm]\n[  149.849623] [\u003cffffffff805209c0\u003e] sys_ioctl+0xc8/0x118\n[  149.849631] [\u003cffffffff80219eb0\u003e] syscall_common+0x34/0x58\n\nThe root cause is the deletion of kvm_mips_commpage_init() leaves vcpu\n-\u003earch.cop0 NULL. So fix it by making cop0 from a pointer to an embedded\nobject.",
  "id": "GHSA-wrx3-9hcj-fp9v",
  "modified": "2025-12-30T15:30:33Z",
  "published": "2025-12-30T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54241"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b9fb255d53759e3ea9b30067cb55091df1caf06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd9cf2a5f9e1b2229ad22f21de6f6ad1a9c8858e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd517f9a9d07d41f4f3593b1da3982261e09d162"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4de2057698636c0ee709e545d19b169d2069fa3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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