CVE-2024-47692

nfsd: return -EINVAL when namelen is 0

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

nfsd: return -EINVAL when namelen is 0

When we have a corrupted main.sqlite in /var/lib/nfs/nfsdcld/, it may
result in namelen being 0, which will cause memdup_user() to return
ZERO_SIZE_PTR.
When we access the name.data that has been assigned the value of
ZERO_SIZE_PTR in nfs4_client_to_reclaim(), null pointer dereference is
triggered.

[ T1205] ==================================================================
[ T1205] BUG: KASAN: null-ptr-deref in nfs4_client_to_reclaim+0xe9/0x260
[ T1205] Read of size 1 at addr 0000000000000010 by task nfsdcld/1205
[ T1205]
[ T1205] CPU: 11 PID: 1205 Comm: nfsdcld Not tainted 5.10.0-00003-g2c1423731b8d #406
[ T1205] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014
[ T1205] Call Trace:
[ T1205] dump_stack+0x9a/0xd0
[ T1205] ? nfs4_client_to_reclaim+0xe9/0x260
[ T1205] __kasan_report.cold+0x34/0x84
[ T1205] ? nfs4_client_to_reclaim+0xe9/0x260
[ T1205] kasan_report+0x3a/0x50
[ T1205] nfs4_client_to_reclaim+0xe9/0x260
[ T1205] ? nfsd4_release_lockowner+0x410/0x410
[ T1205] cld_pipe_downcall+0x5ca/0x760
[ T1205] ? nfsd4_cld_tracking_exit+0x1d0/0x1d0
[ T1205] ? down_write_killable_nested+0x170/0x170
[ T1205] ? avc_policy_seqno+0x28/0x40
[ T1205] ? selinux_file_permission+0x1b4/0x1e0
[ T1205] rpc_pipe_write+0x84/0xb0
[ T1205] vfs_write+0x143/0x520
[ T1205] ksys_write+0xc9/0x170
[ T1205] ? __ia32_sys_read+0x50/0x50
[ T1205] ? ktime_get_coarse_real_ts64+0xfe/0x110
[ T1205] ? ktime_get_coarse_real_ts64+0xa2/0x110
[ T1205] do_syscall_64+0x33/0x40
[ T1205] entry_SYSCALL_64_after_hwframe+0x67/0xd1
[ T1205] RIP: 0033:0x7fdbdb761bc7
[ T1205] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 514
[ T1205] RSP: 002b:00007fff8c4b7248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ T1205] RAX: ffffffffffffffda RBX: 000000000000042b RCX: 00007fdbdb761bc7
[ T1205] RDX: 000000000000042b RSI: 00007fff8c4b75f0 RDI: 0000000000000008
[ T1205] RBP: 00007fdbdb761bb0 R08: 0000000000000000 R09: 0000000000000001
[ T1205] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000042b
[ T1205] R13: 0000000000000008 R14: 00007fff8c4b75f0 R15: 0000000000000000
[ T1205] ==================================================================

Fix it by checking namelen.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-09-30 CVE Reserved
2024-10-21 CVE Published
2024-10-21 CVE Updated
---------- EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (8)

URL	Tag	Source
https://git.kernel.org/stable/c/74725959c33c14114fdce1e36e3504d106584d53	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/0f1d007bbea38a61cf9c5392708dc70ae9d84a3d	2024-10-17
https://git.kernel.org/stable/c/b7b7a8df41ef18862dd6b22289fb46c2c12398af	2024-10-17
https://git.kernel.org/stable/c/84a563d136faf514fdad1ade28d7a142fd313cb8	2024-10-17
https://git.kernel.org/stable/c/318f70857caab3da9a6ada9bc8c1f4f7591b695e	2024-10-04
https://git.kernel.org/stable/c/766d5fbd78f7a52b3888449a0358760477b74602	2024-10-04
https://git.kernel.org/stable/c/1ff8be8d008b9ddc8e7043fbddd37d5d451b271b	2024-10-04
https://git.kernel.org/stable/c/22451a16b7ab7debefce660672566be887db1637	2024-09-20

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 5.10.227 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.10.227"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 5.15.168 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.15.168"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 6.1.113 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 6.1.113"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 6.6.54 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 6.6.54"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 6.10.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 6.10.13"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 6.11.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 6.11.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.2 < 6.12-rc1 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 6.12-rc1"		en		Affected