{"id":"CVE-2024-26906","revision":"dbcd9755969846e380632f48d6b34fc5","records":[{"revision":"dbcd9755969846e380632f48d6b34fc5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-26906","aliases":[],"title":"x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()\n\nWhen trying to use copy_from_kernel_nofault() to read vsyscall page\nthrough a bpf program, the following oops was reported:\n\n BUG: unable to handle page fault for address: ffffffffff600000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ......\n RIP: 0010:copy_from_kernel_nofault+0x6f/0x110\n ......\n Call Trace:\n \n ? copy_from_kernel_nofault+0x6f/0x110\n bpf_probe_read_kernel+0x1d/0x50\n bpf_prog_2061065e56845f08_do_probe_read+0x51/0x8d\n trace_call_bpf+0xc5/0x1c0\n perf_call_bpf_enter.isra.0+0x69/0xb0\n perf_syscall_enter+0x13e/0x200\n syscall_trace_enter+0x188/0x1c0\n do_syscall_64+0xb5/0xe0\n entry_SYSCALL_64_after_hwframe+0x6e/0x76\n \n ......\n ---[ end trace 0000000000000000 ]---\n\nThe oops is triggered when:\n\n1) A bpf program uses bpf_probe_read_kernel() to read from the vsyscall\npage and invokes copy_from_kernel_nofault() which in turn calls\n__get_user_asm().\n\n2) Because the vsyscall page address is not readable from kernel space,\na page fault exception is triggered accordingly.\n\n3) handle_page_fault() considers the vsyscall page address as a user\nspace address instead of a kernel space address. This results in the\nfix-up setup by bpf not being applied and a page_fault_oops() is invoked\ndue to SMAP.\n\nConsidering handle_page_fault() has already considered the vsyscall page\naddress as a userspace address, fix the problem by disallowing vsyscall\npage read for copy_from_kernel_nofault().","state":0,"publishedAt":"2024-04-17T10:27:53.573+00:00","modifiedAt":"2026-10-15T00:39:19.767+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/x86/mm/maccess.c\"\n ],\n \"versions\": [\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"6e4694e65b6db4c3de125115dd4f55848cc48381\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"e8a67fe34b76a49320b33032228a794f40b0316b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"f175de546a3eb77614d94d4c02550181c0a8493e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"57f78c46f08198e1be08ffe99c4c1ccc12855bf5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"29bd6f86904682adafe9affbc7f79b14defcaff8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"75a1a607bb7e6d918be3aca11ec2214a275392f4\",\n \"lessThan\": \"32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/x86/mm/maccess.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.5\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.5\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.214\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.153\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.83\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.23\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.7.11\",\n \"lessThanOrEqual\": \"6.7.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.8\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381","https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b","https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e","https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5","https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8","https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-26906","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-26906","identifiers":["CVE-2024-26906"]},"retained":false,"historicalAffected":[]}],"coverage":[]}