Linux Kernel up to 2277d7cbdf47531b2c3cd01ba15255fa955aab35 tls tls_strp_check_rcv use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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 6.1.146/6.6.99/6.12.39/6.15.7/2277d7cbdf47531b2c3cd01ba15255fa955aab35. It has been declared as critical. Affected by this issue is the function tls_strp_check_rcv of the component tls. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2025-38471. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.1.146/6.6.99/6.12.39/6.15.7/2277d7cbdf47531b2c3cd01ba15255fa955aab35. This vulnerability affects the function tls_strp_check_rcv of the component tls. 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. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: tls: always refresh the queue when reading sock After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry. BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls] (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544) Read of size 4 at addr ffff888013085750 by task tls/13529 CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme Call Trace: kasan_report+0xca/0x100 tls_strp_check_rcv+0x898/0x9a0 [tls] tls_rx_rec_wait+0x2c9/0x8d0 [tls] tls_sw_recvmsg+0x40f/0x1aa0 [tls] inet_recvmsg+0x1c3/0x1f0 Always reload the queue, fast path is to have the record in the queue when we wake, anyway (IOW the path going down "if !strp->stm.full_len").

The advisory is available at git.kernel.org. This vulnerability was named CVE-2025-38471 since 04/16/2025. The exploitation appears to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/25/2026).

The vulnerability scanner Nessus provides a plugin with the ID 251308 (Linux Distros Unpatched Vulnerability : CVE-2025-38471), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.147, 6.6.100, 6.12.40 or 6.15.8 eliminates this vulnerability. Applying the patch 730fed2ff5e259495712518e18d9f521f61972bb/1f3a429c21e0e43e8b8c55d30701e91411a4df02/cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8/c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6/4ab26bce3969f8fd925fe6f6f551e4d1a508c68b 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 (251308) and CERT Bund (WID-SEC-2025-1665). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • Dell Avamar
  • NetApp ActiveIQ Unified Manager
  • Dell PowerProtect Data Domain
  • Open Source Linux Kernel
  • Dell NetWorker
  • Dell Secure Connect Gateway
  • IBM Security Verify Access

Productinfo

Type

Vendor

Name

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: 251308
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-38471

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.147/6.6.100/6.12.40/6.15.8
Patch: 730fed2ff5e259495712518e18d9f521f61972bb/1f3a429c21e0e43e8b8c55d30701e91411a4df02/cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8/c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6/4ab26bce3969f8fd925fe6f6f551e4d1a508c68b

Timelineinfo

04/16/2025 CVE reserved
07/28/2025 +103 days Advisory disclosed
07/28/2025 +0 days VulDB entry created
01/25/2026 +181 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-38471 (🔒)
GCVE (CVE): GCVE-0-2025-38471
GCVE (VulDB): GCVE-100-317890
CERT Bund: WID-SEC-2025-1665 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 07/28/2025 14:45
Updated: 01/25/2026 13:46
Changes: 07/28/2025 14:45 (59), 08/17/2025 20:23 (7), 08/18/2025 12:24 (1), 08/19/2025 11:04 (2), 08/20/2025 12:17 (1), 08/26/2025 16:03 (1), 09/30/2025 11:43 (1), 10/18/2025 10:01 (1), 11/02/2025 00:36 (1), 11/16/2025 19:16 (1), 12/22/2025 21:09 (12), 01/25/2026 13:46 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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