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In the Linux kernel, the following vulnerability has been...

Moderate severity Unreviewed Published Oct 21, 2024 to the GitHub Advisory Database • Updated Nov 8, 2024

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

Description

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.

References

Published by the National Vulnerability Database Oct 21, 2024
Published to the GitHub Advisory Database Oct 21, 2024
Last updated Nov 8, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.096%
(41st percentile)

Weaknesses

CVE ID

CVE-2024-47692

GHSA ID

GHSA-8qr4-5p7h-w8mm

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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