CVE-2024-36939

CVE Details

Release Date:

2024-05-30

Description

In the Linux kernel, the following vulnerability has been resolved:\nnfs: Handle error of rpc_proc_register() in nfs_net_init().\nsyzkaller reported a warning [0] triggered while destroying immature\nnetns.\nrpc_proc_register() was called in init_nfs_fs(), but its error\nhas been ignored since at least the initial commit 1da177e4c3f4\n('Linux-2.6.12-rc2').\nRecently, commit d47151b79e32 ('nfs: expose /proc/net/sunrpc/nfs\nin net namespaces') converted the procfs to per-netns and made\nthe problem more visible.\nEven when rpc_proc_register() fails, nfs_net_init() could succeed,\nand thus nfs_net_exit() will be called while destroying the netns.\nThen, remove_proc_entry() will be called for non-existing proc\ndirectory and trigger the warning below.\nLet's handle the error of rpc_proc_register() properly in nfs_net_init().\n[0]:\nname 'nfs'\nWARNING: CPU: 1 PID: 1710 at fs/proc/generic.c:711 remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711\nModules linked in:\nCPU: 1 PID: 1710 Comm: syz-executor.2 Not tainted 6.8.0-12822-gcd51db110a7e #12\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nRIP: 0010:remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711\nCode: 41 5d 41 5e c3 e8 85 09 b5 ff 48 c7 c7 88 58 64 86 e8 09 0e 71 02 e8 74 09 b5 ff 4c 89 e6 48 c7 c7 de 1b 80 84 e8 c5 ad 97 ff <0f> 0b eb b1 e8 5c 09 b5 ff 48 c7 c7 88 58 64 86 e8 e0 0d 71 02 eb\nRSP: 0018:ffffc9000c6d7ce0 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: ffff8880422b8b00 RCX: ffffffff8110503c\nRDX: ffff888030652f00 RSI: ffffffff81105045 RDI: 0000000000000001\nRBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000001 R11: ffffffff81bb62cb R12: ffffffff84807ffc\nR13: ffff88804ad6fcc0 R14: ffffffff84807ffc R15: ffffffff85741ff8\nFS: 00007f30cfba8640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ff51afe8000 CR3: 000000005a60a005 CR4: 0000000000770ef0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n\nrpc_proc_unregister+0x64/0x70 net/sunrpc/stats.c:310\nnfs_net_exit+0x1c/0x30 fs/nfs/inode.c:2438\nops_exit_list+0x62/0xb0 net/core/net_namespace.c:170\nsetup_net+0x46c/0x660 net/core/net_namespace.c:372\ncopy_net_ns+0x244/0x590 net/core/net_namespace.c:505\ncreate_new_namespaces+0x2ed/0x770 kernel/nsproxy.c:110\nunshare_nsproxy_namespaces+0xae/0x160 kernel/nsproxy.c:228\nksys_unshare+0x342/0x760 kernel/fork.c:3322\n__do_sys_unshare kernel/fork.c:3393 [inline]\n__se_sys_unshare kernel/fork.c:3391 [inline]\n__x64_sys_unshare+0x1f/0x30 kernel/fork.c:3391\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0x4f/0x110 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x46/0x4e\nRIP: 0033:0x7f30d0febe5d\nCode: ff 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 73 9f 1b 00 f7 d8 64 89 01 48\nRSP: 002b:00007f30cfba7cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110\nRAX: ffffffffffffffda RBX: 00000000004bbf80 RCX: 00007f30d0febe5d\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c020600\nRBP: 00000000004bbf80 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002\nR13: 000000000000000b R14: 00007f30d104c530 R15: 0000000000000000\n

See more information about CVE-2024-36939 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

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-7000	2024-09-24
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14