cve-2021-47463
Vulnerability from cvelistv5
Published
2024-05-22 06:23
Modified
2024-12-19 07:42
Severity ?
Summary
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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49
Version: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49
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   Linux Linux Version: 5.14
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}


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