CVE-2024-26906— x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()
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I. Basic Information for CVE-2024-26906
Vulnerability Information
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Vulnerability Title
x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() When trying to use copy_from_kernel_nofault() to read vsyscall page through a bpf program, the following oops was reported: BUG: unable to handle page fault for address: ffffffffff600000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ...... RIP: 0010:copy_from_kernel_nofault+0x6f/0x110 ...... Call Trace: <TASK> ? copy_from_kernel_nofault+0x6f/0x110 bpf_probe_read_kernel+0x1d/0x50 bpf_prog_2061065e56845f08_do_probe_read+0x51/0x8d trace_call_bpf+0xc5/0x1c0 perf_call_bpf_enter.isra.0+0x69/0xb0 perf_syscall_enter+0x13e/0x200 syscall_trace_enter+0x188/0x1c0 do_syscall_64+0xb5/0xe0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK> ...... ---[ end trace 0000000000000000 ]--- The oops is triggered when: 1) A bpf program uses bpf_probe_read_kernel() to read from the vsyscall page and invokes copy_from_kernel_nofault() which in turn calls __get_user_asm(). 2) Because the vsyscall page address is not readable from kernel space, a page fault exception is triggered accordingly. 3) handle_page_fault() considers the vsyscall page address as a user space address instead of a kernel space address. This results in the fix-up setup by bpf not being applied and a page_fault_oops() is invoked due to SMAP. Considering handle_page_fault() has already considered the vsyscall page address as a userspace address, fix the problem by disallowing vsyscall page read for copy_from_kernel_nofault().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于允许copy_from_kernel_nofault() 读取 vsyscall 页面。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-26906
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Same Patch Batch · Linux · 2024-04-17 · 100 CVEs total
| CVE-2024-26883 | bpf: Fix stackmap overflow check on 32-bit arches | |
| CVE-2024-26877 | crypto: xilinx - call finalize with bh disabled | |
| CVE-2024-26873 | scsi: hisi_sas: Fix a deadlock issue related to automatic dump | |
| CVE-2024-26872 | RDMA/srpt: Do not register event handler until srpt device is fully setup | |
| CVE-2024-26871 | f2fs: fix NULL pointer dereference in f2fs_submit_page_write() | |
| CVE-2024-26870 | NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102 | |
| CVE-2024-26869 | f2fs: fix to truncate meta inode pages forcely | |
| CVE-2024-26874 | drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip | |
| CVE-2024-26881 | net: hns3: fix kernel crash when 1588 is received on HIP08 devices | |
| CVE-2024-26882 | net: ip_tunnel: make sure to pull inner header in ip_tunnel_rcv() | |
| CVE-2024-26880 | dm: call the resume method on internal suspend | |
| CVE-2024-26884 | bpf: Fix hashtab overflow check on 32-bit arches | |
| CVE-2024-26885 | bpf: Fix DEVMAP_HASH overflow check on 32-bit arches | |
| CVE-2024-26886 | Bluetooth: af_bluetooth: Fix deadlock | |
| CVE-2024-26887 | Bluetooth: btusb: Fix memory leak | |
| CVE-2024-26888 | Bluetooth: msft: Fix memory leak | |
| CVE-2024-26889 | Bluetooth: hci_core: Fix possible buffer overflow | |
| CVE-2024-26890 | Bluetooth: btrtl: fix out of bounds memory access | |
| CVE-2024-26891 | iommu/vt-d: Don't issue ATS Invalidation request when device is disconnected | |
| CVE-2024-26892 | wifi: mt76: mt7921e: fix use-after-free in free_irq() |
Showing top 20 of 100 CVEs. View all on vendor page → →
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Same vendor: Linux
- CVE-2026-43500
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scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
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