vulnerability
Amazon Linux AMI 2: CVE-2025-37756: Security patch for kernel (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | May 1, 2025 | Jun 24, 2025 | May 20, 2026 |
Description
In the Linux kernel, the following vulnerability has been resolved:
net: tls: explicitly disallow disconnect
syzbot discovered that it can disconnect a TLS socket and then
run into all sort of unexpected corner cases. I have a vague
recollection of Eric pointing this out to us a long time ago.
Supporting disconnect is really hard, for one thing if offload
is enabled we'd need to wait for all packets to be _acked_.
Disconnect is not commonly used, disallow it.
The immediate problem syzbot run into is the warning in the strp,
but that's just the easiest bug to trigger:
WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
Call Trace:
<TASK>
tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363
tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043
inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678
sock_recvmsg_nosec net/socket.c:1023 [inline]
sock_recvmsg+0x109/0x280 net/socket.c:1045
__sys_recvfrom+0x202/0x380 net/socket.c:2237
Solutions
References
- AMAZON-AL2/ALAS2KERNEL-5.10-2025-094
- AMAZON-AL2/ALAS2KERNEL-5.15-2025-073
- AMAZON-AL2/ALAS2KERNEL-5.15-2025-076
- AMAZON-AL2/ALAS2KERNEL-5.15-2025-079
- AMAZON-AL2/ALASKERNEL-5.15-2025-076
- CVE-2025-37756
- https://attackerkb.com/topics/CVE-2025-37756
- EUVD-EUVD-2025-13060
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-13060
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