CVE Details
Description
In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: validate user input for expected length\nI got multiple syzbot reports showing old bugs exposed\nby BPF after commit 20f2505fb436 ('bpf: Try to avoid kzalloc\nin cgroup/{s,g}etsockopt')\nsetsockopt() @optlen argument should be taken into account\nbefore copying data.\nBUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]\nBUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]\nBUG: KASAN: slab-out-of-bounds in do_replace net/ipv4/netfilter/ip_tables.c:1111 [inline]\nBUG: KASAN: slab-out-of-bounds in do_ipt_set_ctl+0x902/0x3dd0 net/ipv4/netfilter/ip_tables.c:1627\nRead of size 96 at addr ffff88802cd73da0 by task syz-executor.4/7238\nCPU: 1 PID: 7238 Comm: syz-executor.4 Not tainted 6.9.0-rc2-next-20240403-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\nprint_address_description mm/kasan/report.c:377 [inline]\nprint_report+0x169/0x550 mm/kasan/report.c:488\nkasan_report+0x143/0x180 mm/kasan/report.c:601\nkasan_check_range+0x282/0x290 mm/kasan/generic.c:189\n__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105\ncopy_from_sockptr_offset include/linux/sockptr.h:49 [inline]\ncopy_from_sockptr include/linux/sockptr.h:55 [inline]\ndo_replace net/ipv4/netfilter/ip_tables.c:1111 [inline]\ndo_ipt_set_ctl+0x902/0x3dd0 net/ipv4/netfilter/ip_tables.c:1627\nnf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101\ndo_sock_setsockopt+0x3af/0x720 net/socket.c:2311\n__sys_setsockopt+0x1ae/0x250 net/socket.c:2334\n__do_sys_setsockopt net/socket.c:2343 [inline]\n__se_sys_setsockopt net/socket.c:2340 [inline]\n__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\ndo_syscall_64+0xfb/0x240\nentry_SYSCALL_64_after_hwframe+0x72/0x7a\nRIP: 0033:0x7fd22067dde9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fd21f9ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036\nRAX: ffffffffffffffda RBX: 00007fd2207abf80 RCX: 00007fd22067dde9\nRDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003\nRBP: 00007fd2206ca47a R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000020000880 R11: 0000000000000246 R12: 0000000000000000\nR13: 000000000000000b R14: 00007fd2207abf80 R15: 00007ffd2d0170d8\n\nAllocated by task 7238:\nkasan_save_stack mm/kasan/common.c:47 [inline]\nkasan_save_track+0x3f/0x80 mm/kasan/common.c:68\npoison_kmalloc_redzone mm/kasan/common.c:370 [inline]\n__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387\nkasan_kmalloc include/linux/kasan.h:211 [inline]\n__do_kmalloc_node mm/slub.c:4069 [inline]\n__kmalloc_noprof+0x200/0x410 mm/slub.c:4082\nkmalloc_noprof include/linux/slab.h:664 [inline]\n__cgroup_bpf_run_filter_setsockopt+0xd47/0x1050 kernel/bpf/cgroup.c:1869\ndo_sock_setsockopt+0x6b4/0x720 net/socket.c:2293\n__sys_setsockopt+0x1ae/0x250 net/socket.c:2334\n__do_sys_setsockopt net/socket.c:2343 [inline]\n__se_sys_setsockopt net/socket.c:2340 [inline]\n__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\ndo_syscall_64+0xfb/0x240\nentry_SYSCALL_64_after_hwframe+0x72/0x7a\nThe buggy address belongs to the object at ffff88802cd73da0\nwhich belongs to the cache kmalloc-8 of size 8\nThe buggy address is located 0 bytes inside of\nallocated 1-byte region [ffff88802cd73da0, ffff88802cd73da1)\nThe buggy address belongs to the physical page:\npage: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802cd73020 pfn:0x2cd73\nflags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)\npage_type: 0xffffefff(slab)\nraw: 00fff80000000000 ffff888015041280 dead000000000100 dead000000000122\nraw: ffff88802cd73020 000000008080007f 00000001ffffefff 00\n---truncated---
See more information about CVE-2024-35896 from MITRE CVE dictionary and NIST NVD
CVSS Scoring
NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.
| Base Score: |
5.5 |
CVSS Vector: |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector: |
Local network |
Attack Complexity: |
Low |
| Privileges Required: |
Low |
User Interaction: |
None |
| Scope: |
Unchanged |
Confidentiality Impact: |
None |
| Integrity Impact: |
None |
Availability Impact: |
High |
Errata information
