ghsa-xjr2-g37g-hrjm
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
mm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()
Check for a NULL page->mapping before dereferencing the mapping in page_is_secretmem(), as the page's mapping can be nullified while gup() is running, e.g. by reclaim or truncation.
BUG: kernel NULL pointer dereference, address: 0000000000000068 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G W RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0 Code: <48> 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046 RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900 ... CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0 Call Trace: get_user_pages_fast_only+0x13/0x20 hva_to_pfn+0xa9/0x3e0 try_async_pf+0xa1/0x270 direct_page_fault+0x113/0xad0 kvm_mmu_page_fault+0x69/0x680 vmx_handle_exit+0xe1/0x5d0 kvm_arch_vcpu_ioctl_run+0xd81/0x1c70 kvm_vcpu_ioctl+0x267/0x670 __x64_sys_ioctl+0x83/0xa0 do_syscall_64+0x56/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
{
"affected": [],
"aliases": [
"CVE-2021-47463"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-22T07:15:11Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix NULL page-\u003emapping dereference in page_is_secretmem()\n\nCheck for a NULL page-\u003emapping before dereferencing the mapping in\npage_is_secretmem(), as the page\u0027s mapping can be nullified while gup()\nis running, e.g. by reclaim or truncation.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000068\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G W\n RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0\n Code: \u003c48\u003e 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be\n RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046\n RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900\n ...\n CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0\n Call Trace:\n get_user_pages_fast_only+0x13/0x20\n hva_to_pfn+0xa9/0x3e0\n try_async_pf+0xa1/0x270\n direct_page_fault+0x113/0xad0\n kvm_mmu_page_fault+0x69/0x680\n vmx_handle_exit+0xe1/0x5d0\n kvm_arch_vcpu_ioctl_run+0xd81/0x1c70\n kvm_vcpu_ioctl+0x267/0x670\n __x64_sys_ioctl+0x83/0xa0\n do_syscall_64+0x56/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae",
"id": "GHSA-xjr2-g37g-hrjm",
"modified": "2024-05-22T09:31:45Z",
"published": "2024-05-22T09:31:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47463"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767"
}
],
"schema_version": "1.4.0",
"severity": []
}