🛡️ AZL-50827 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2024-47692 affecting package kernel for versions less than 5.15.173.1-1

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

AZL-50827 is recorded against 1 package.

  • kernel (fixed in 5.15.173.1-1)

Timeline and source

Published on 21 October 2024 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-10-21
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 5.15.173.1-1

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