{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56368", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-09T09:49:29.671Z", "datePublished": "2025-01-11T12:35:45.719Z", "dateUpdated": "2026-08-05T11:44:53.114Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:44:53.114Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix overflow in __rb_map_vma\n\nAn overflow occurred when performing the following calculation:\n\n nr_pages = ((nr_subbufs + 1) << subbuf_order) - pgoff;\n\nAdd a check before the calculation to avoid this problem.\n\nsyzbot reported this as a slab-out-of-bounds in __rb_map_vma:\n\nBUG: KASAN: slab-out-of-bounds in __rb_map_vma+0x9ab/0xae0 kernel/trace/ring_buffer.c:7058\nRead of size 8 at addr ffff8880767dd2b8 by task syz-executor187/5836\n\nCPU: 0 UID: 0 PID: 5836 Comm: syz-executor187 Not tainted 6.13.0-rc2-syzkaller-00159-gf932fb9b4074 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:489\n kasan_report+0xd9/0x110 mm/kasan/report.c:602\n __rb_map_vma+0x9ab/0xae0 kernel/trace/ring_buffer.c:7058\n ring_buffer_map+0x56e/0x9b0 kernel/trace/ring_buffer.c:7138\n tracing_buffers_mmap+0xa6/0x120 kernel/trace/trace.c:8482\n call_mmap include/linux/fs.h:2183 [inline]\n mmap_file mm/internal.h:124 [inline]\n __mmap_new_file_vma mm/vma.c:2291 [inline]\n __mmap_new_vma mm/vma.c:2355 [inline]\n __mmap_region+0x1786/0x2670 mm/vma.c:2456\n mmap_region+0x127/0x320 mm/mmap.c:1348\n do_mmap+0xc00/0xfc0 mm/mmap.c:496\n vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580\n ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:542\n __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]\n __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]\n __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe reproducer for this bug is:\n\n------------------------8<-------------------------\n #include \n #include \n #include \n #include \n #include \n\n int main(int argc, char **argv)\n {\n\tint page_size = getpagesize();\n\tint fd;\n\tvoid *meta;\n\n\tsystem(\"echo 1 > /sys/kernel/tracing/buffer_size_kb\");\n\tfd = open(\"/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw\", O_RDONLY);\n\n\tmeta = mmap(NULL, page_size, PROT_READ, MAP_SHARED, fd, page_size * 5);\n }\n------------------------>8-------------------------" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Triggered by an mmap(2) syscall on the local tracefs file /sys/kernel/tracing/per_cpu/cpuN/trace_pipe_raw; there is no remote or adjacent path into ring_buffer_map().\nAC:L - A single deterministic mmap() with an oversized page offset triggers the unsigned underflow every time — no race, no memory-layout grooming, and the required tracing/tracefs support is enabled in essentially all distro kernels.\nPR:L - Only a read-only open of trace_pipe_raw is needed (the reproducer's buffer_size_kb write is not required), and tracefs files are group-readable with a supported gid= mount option that Android, ChromeOS, and distro \"tracing\"-group configurations use to grant unprivileged users access.\nUI:N - The attacking process performs open() and mmap() entirely on its own; no victim action or interaction is involved.\nS:U - The out-of-bounds access and its consequences are confined to the kernel of the same host, with no crossing of a VM, IOMMU, or other security-authority boundary.\nC:H - The overread offset is fully attacker-controlled up to ~2^54 bytes from the kcalloc'd subbuf_ids array — an unbounded arbitrary-address read primitive rather than a few-byte bounded overread, and its mapped/unmapped outcome discloses kernel address-space layout.\nI:N - The faulty path only reads; pages[] writes remain bounded by nr_pages and the bogus struct page pointer is discarded at the WARN before vm_insert_pages(), so no kernel memory is modified and no attacker page is mapped.\nA:H - Dereferencing subbuf_ids at an arbitrary attacker-chosen displacement reliably faults on unmapped kernel memory, causing an oops while mapping_lock, buffer->mutex, and mmap_lock are held; the WARN_ON_ONCE alone panics systems configured with panic_on_warn." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/ring_buffer.c" ], "versions": [ { "version": "117c39200d9d760cbd5944bb89efb7b9c51965aa", "lessThan": "ec12f30fe54234dd40ffee50dda8d2df10bd0871", "status": "affected", "versionType": "git" }, { "version": "117c39200d9d760cbd5944bb89efb7b9c51965aa", "lessThan": "c58a812c8e49ad688f94f4b050ad5c5b388fc5d2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/ring_buffer.c" ], "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.7", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ec12f30fe54234dd40ffee50dda8d2df10bd0871" }, { "url": "https://git.kernel.org/stable/c/c58a812c8e49ad688f94f4b050ad5c5b388fc5d2" } ], "title": "ring-buffer: Fix overflow in __rb_map_vma", "x_generator": { "engine": "bippy-1.2.0" } } } }