CVE-2023-52999 Information

Mar 28, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

net: fix UaF in netns ops registration error path

If net_assign_generic() fails the current error path in ops_init() tries to clear the gen pointer slot. Anyway in such error path the gen pointer itself has not been modified yet and the existing and accessed one is smaller than the accessed index causing an out-of-bounds error:

BUG: KASAN: slab-out-of-bounds in ops_init+0x2de/0x320 Write of size 8 at addr ffff888109124978 by task modprobe/1018

CPU: 2 PID: 1018 Comm: modprobe Not tainted 6.2.0-rc2.mptcp_ae5ac65fbed5+ 1641 Hardware name: QEMU Standard PC (Q35 + ICH9 2009) BIOS 1.16.1-2.fc37 04/01/2014 Call Trace: dump_stack_lvl+0x6a/0x9f print_address_description.constprop.0+0x86/0x2b5 print_report+0x11b/0x1fb kasan_report+0x87/0xc0 ops_init+0x2de/0x320 register_pernet_operations+0x2e4/0x750 register_pernet_subsys+0x24/0x40 tcf_register_action+0x9f/0x560 do_one_initcall+0xf9/0x570 do_init_module+0x190/0x650 load_module+0x1fa5/0x23c0 __do_sys_finit_module+0x10d/0x1b0 do_syscall_64+0x58/0x80 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f42518f778d Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d cb 56 2c 00 f7 d8 64 89 01 48 RSP: 002b:00007fff96869688 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 00005568ef7f7c90 RCX: 00007f42518f778d RDX: 0000000000000000 RSI: 00005568ef41d796 RDI: 0000000000000003 RBP: 00005568ef41d796 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00005568ef7f7d30 R14: 0000000000040000 R15: 0000000000000000

This change addresses the issue by skipping the gen pointer de-reference in the mentioned error-path.

Found by code inspection and verified with explicit error injection on a kasan-enabled kernel.

Reference

https://git.kernel.org/stable/c/12075708f2e77ee6a9f8bb2cf512c38be3099794 https://git.kernel.org/stable/c/66689a72ba73575e76d4f6a8748d3fa2690ec1c4 https://git.kernel.org/stable/c/71ab9c3e2253619136c31c89dbb2c69305cc89b1 https://git.kernel.org/stable/c/ad0dfe9bcf0d78e699c7efb64c90ed062dc48bea https://git.kernel.org/stable/c/d4c008f3b7f7d4ffd311eb2dae5e75b3cbddacd0 https://git.kernel.org/stable/c/ddd49cbbd4c1ceb38032018b589b44208e54f55e

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