Linux Kernel up to 6.0.2 sctp sctp_auth_asoc_init_active_key use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.0.2. It has been rated as critical. This vulnerability affects the function sctp_auth_asoc_init_active_key of the component sctp. This manipulation causes use after free. This vulnerability appears as CVE-2022-50243. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.0.2. It has been declared as critical. Affected by this vulnerability is the function sctp_auth_asoc_init_active_key of the component sctp. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: sctp: handle the error returned from sctp_auth_asoc_init_active_key When it returns an error from sctp_auth_asoc_init_active_key(), the active_key is actually not updated. The old sh_key will be freeed while it's still used as active key in asoc. Then an use-after-free will be triggered when sending patckets, as found by syzbot: sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112 sctp_set_owner_w net/sctp/socket.c:132 [inline] sctp_sendmsg_to_asoc+0xbd5/0x1a20 net/sctp/socket.c:1863 sctp_sendmsg+0x1053/0x1d50 net/sctp/socket.c:2025 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 This patch is to fix it by not replacing the sh_key when it returns errors from sctp_auth_asoc_init_active_key() in sctp_auth_set_key(). For sctp_auth_set_active_key(), old active_key_id will be set back to asoc->active_key_id when the same thing happens.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2022-50243 since 09/15/2025. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/10/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265163 (Linux Distros Unpatched Vulnerability : CVE-2022-50243), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.262, 5.4.220, 5.10.150, 5.15.75, 5.19.17 or 6.0.3 eliminates this vulnerability. Applying the patch b8fa99a3a11bdd77fef6b4a97f1021eb30b5ba40/382ff44716603a54f5fd238ddec6a2468e217612/f65955340e0044f5c41ac799a01698ac7dee8a4e/19d636b663e0e92951bba5fced929ca7fd25c552/0f90099d18e3abdc01babf686f41f63fe04939c1/3b0fcf5e29c0940e1169ce9c44f73edd98bdf12d 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 databases at Tenable (265163) and CERT Bund (WID-SEC-2025-2053). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 265163
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2022-50243

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.19.262/5.4.220/5.10.150/5.15.75/5.19.17/6.0.3
Patch: b8fa99a3a11bdd77fef6b4a97f1021eb30b5ba40/382ff44716603a54f5fd238ddec6a2468e217612/f65955340e0044f5c41ac799a01698ac7dee8a4e/19d636b663e0e92951bba5fced929ca7fd25c552/0f90099d18e3abdc01babf686f41f63fe04939c1/3b0fcf5e29c0940e1169ce9c44f73edd98bdf12d

Timelineinfo

09/15/2025 Advisory disclosed
09/15/2025 +0 days CVE reserved
09/15/2025 +0 days VulDB entry created
01/10/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2022-50243 (🔒)
GCVE (CVE): GCVE-0-2022-50243
GCVE (VulDB): GCVE-100-323953
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/15/2025 16:44
Updated: 01/10/2026 07:42
Changes: 09/15/2025 16:44 (59), 09/16/2025 10:15 (7), 09/20/2025 15:11 (2), 11/24/2025 21:33 (11), 12/27/2025 20:44 (1), 01/10/2026 07:42 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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