VDB-296871 · CVE-2022-49307 · Nessus 235744

Linux Kernel up to 5.18.3 slgt_clean null pointer dereference

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5.0	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.18.3. This vulnerability affects the function slgt_clean. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2022-49307. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.18.3. It has been classified as critical. This affects the function slgt_clean. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat: [ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] Fix this by checking whether the 'info->netdev' is a null pointer first.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2022-49307 since 02/26/2025. The exploitability is told to be difficult. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 235744 (EulerOS 2.0 SP10 : kernel (EulerOS-SA-2025-1520)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9.318, 4.14.283, 4.19.247, 5.4.198, 5.10.122, 5.15.47, 5.17.15 or 5.18.4 eliminates this vulnerability. Applying the patch 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d/078212ad15dbd88840c82c97f12c93d83703c8fd/ba08cbc5b53e151d0acf1930fb526fc65b7f3e65/f6e07eb7ebec53ffe81fc2489589320fbe4a6b75/d68d5e68b7f64de7170f8e04dd9b995c36b2c71c/8a95696bdc0e13f8980f05b54a3b9081963d1256/ddd67751ab86c6a65f95c35293c42f85a42ac05d/1ceb4ca9543a8a788febf6bc8dad2e605e172d5e/689ca31c542687709ba21ec2195c1fbce34fd029 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (235744). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 235744
Nessus Name: EulerOS 2.0 SP10 : kernel (EulerOS-SA-2025-1520)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Timelineinfo

02/26/2025 🔍
02/26/2025 +0 days 🔍
02/26/2025 +0 days 🔍
05/13/2025 +76 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2022-49307 (🔍)
GCVE (CVE): GCVE-0-2022-49307
GCVE (VulDB): GCVE-100-296871

Entryinfo

Created: 02/26/2025 08:10
Updated: 05/13/2025 13:34
Changes: 02/26/2025 08:10 (58), 03/18/2025 06:58 (12), 05/13/2025 13:34 (2)
Complete: 🔍
Cache ID: 216::103