CVE-2024-26906x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()
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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().
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 75a1a607bb7e6d918be3aca11ec2214a275392f4 builds before 6e4694e65b6db4c3de125115dd4f55848cc48381; from 75a1a607bb7e6d918be3aca11ec2214a275392f4 before e8a67fe34b76a49320b33032228a794f40b0316b; from 75a1a607bb7e6d918be3aca11ec2214a275392f4 before f175de546a3eb77614d94d4c02550181c0a8493e; 75a1a607bb7e6d918be3aca11ec2214a275392f4 builds before 57f78c46f08198e1be08ffe99c4c1ccc12855bf5; 75a1a607bb7e6d918be3aca11ec2214a275392f4 builds before 29bd6f86904682adafe9affbc7f79b14defcaff8; from 75a1a607bb7e6d918be3aca11ec2214a275392f4 before 32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 5.10.214; from 5.11 before 5.15.153; from 5.16 before 6.1.83; from 6.2 before 6.6.23; from 6.7 before 6.7.11; 6.8; 6.8; 6.8; and 2 more ranges | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381patch
- https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316bpatch
- https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493epatch
- https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5patch
- https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8patch
- https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlthird-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.