CVE-2025-38471
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-07-28

Last updated on: 2025-11-03

Assigner: kernel.org

Description
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").
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Meta Information
Published
2025-07-28
Last Modified
2025-11-03
Generated
2026-05-07
AI Q&A
2025-07-28
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38471
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a use-after-free bug in the Linux kernel's TLS implementation. Due to recent changes in TCP that compact socket buffers (skbs) more aggressively, the TLS code may attempt to operate on an old skb that has already been freed when checking if all skbs in the queue have matching decrypt state and geometry. This can lead to a kernel bug detected by KASAN (Kernel Address Sanitizer). The fix involves always refreshing the queue when reading the socket to avoid using stale skbs.


How can this vulnerability impact me? :

This vulnerability can cause a kernel crash or instability due to use-after-free errors in the TLS code path. It may lead to denial of service or unpredictable behavior in applications relying on TLS over TCP in the Linux kernel. Exploiting this bug could potentially compromise system stability or security.


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