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Linux Kernel CVE-2025-38471

HIGH
Use After Free (CWE-416)
2025-07-28 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Use After Free Memory Corruption Debian Debian Linux
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.4 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
May 12, 2026 - 13:31 vuln.today
CVE Published
Jul 28, 2025 - 12:15 nvd
HIGH 7.8

DescriptionNVD

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").

AnalysisAI

Use-after-free in Linux kernel TLS implementation allows local authenticated users to achieve high confidentiality, integrity, and availability impact through memory corruption. The vulnerability, triggered by aggressive TCP SKB compaction in net-next, causes TLS to operate on freed socket buffers when checking decrypt state. A vendor patch is available across multiple kernel versions (6.1-rc2 through 6.1-rc5 and later stable branches). No active exploitation confirmed, but CWE-416 use-after-free bugs are frequently targeted due to their code execution potential. EPSS data not provided.

Technical ContextAI

This vulnerability affects the Linux kernel's TLS (Transport Layer Security) implementation, specifically in the tls_strp_check_rcv function within net/tls/tls_strp.c. The root cause is CWE-416 (Use After Free), a memory safety issue where code accesses memory after it has been freed. Recent changes to TCP's SKB (socket buffer) compaction logic in net-next made the kernel more aggressive about consolidating network packet buffers to improve memory efficiency. This exposed a latent bug in the TLS strparser code where the function checks if all SKBs in the receive queue have matching decrypt state and geometry. The TLS code was not refreshing its reference to the queue after potential SKB compaction, leading to operations on already-freed SKB structures. The KASAN (Kernel Address Sanitizer) report shows a slab-use-after-free at a 4-byte read operation, indicating the code attempted to dereference a freed object. The fix involves always reloading the queue state before operations, particularly in the fast path where a record is expected to be in the queue when the process wakes (the 'if !strp->stm.full_len' code path). Affected versions span from Linux kernel 6.1-rc2 through 6.1-rc5 and potentially later versions that incorporated the aggressive TCP compaction changes before this TLS fix was applied.

RemediationAI

Update to patched Linux kernel versions containing commits 1f3a429c21e0e43e8b8c55d30701e91411a4df02, 4ab26bce3969f8fd925fe6f6f551e4d1a508c68b, 730fed2ff5e259495712518e18d9f521f61972bb, c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6, or cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8 from git.kernel.org stable tree. Debian users should follow guidance in debian-lts-announce 2025/10/msg00008.html for distribution-specific patched packages. Siemens product users should consult CERT advisory SSA-082556 at cert-portal.siemens.com. If immediate patching is not feasible, compensating controls include restricting local user access to trusted administrators only, disabling kernel TLS if not required by workload (check if kTLS offload is in use for your applications), implementing mandatory access controls (SELinux/AppArmor) to limit process capabilities, and monitoring for abnormal TLS socket operations. Note that disabling kernel TLS may impact performance for applications utilizing TLS offload features and force TLS processing back to userspace. Container environments should ensure kernel is patched on the host system as containers share the host kernel.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Affected
Image SLES15-SP6-Azure-3P Image SLES15-SP6-Azure-Basic Image SLES15-SP6-Azure-Standard Image SLES15-SP6-HPC Image SLES15-SP6-HPC-Azure Affected
Image SLES15-SP6-SAP-Azure-3P Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-BYOS Image SLES15-SP6-SAP-BYOS-Azure Image SLES15-SP6-SAP-BYOS-EC2 Image SLES15-SP6-SAP-BYOS-GCE Image SLES15-SP6-SAP-Hardened Image SLES15-SP6-SAP-Hardened-Azure Image SLES15-SP6-SAP-Hardened-BYOS Image SLES15-SP6-SAP-Hardened-BYOS-Azure Image SLES15-SP6-SAP-Hardened-BYOS-EC2 Image SLES15-SP6-SAP-Hardened-BYOS-GCE Image SLES15-SP6-SAP-Hardened-EC2 Image SLES15-SP6-SAP-Hardened-GCE Affected

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CVE-2025-38471 vulnerability details – vuln.today
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