CVE-2025-37756

net: tls: explicitly disallow disconnect

State: Published
Severity: 7.8 High
Published: May 1, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cfAffected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before ac91c6125468be720eafde9c973994cb45b61d44Affected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before f3ce4d3f874ab7919edca364c147ac735f9f1d04Affected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 2bcad8fefcecdd5f005d8c550b25d703c063c34aAffected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 9fcbca0f801580cbb583e9cb274e2c7fbe766ca6Affected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before c665bef891e8972e1d3ce5bbc0d42a373346a2c3Affected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 8513411ec321942bd3cfed53d5bb700665c67d86Affected 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 5071a1e606b30c0c11278d3c6620cd6a24724cf6Affected
LinuxLinux	4.13Affected before 4.13Not affected 5.10.237 through 5.10.Not affected 5.15.181 through 5.15.Not affected 6.1.135 through 6.1.Not affected 6.6.88 through 6.6.Not affected 6.12.24 through 6.12.Not affected 6.13.12 through 6.13.Not affected 6.14.3 through 6.14.*Not affected 6.15 and laterNot affected

Product

Versions

LinuxLinux

3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cfAffected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before ac91c6125468be720eafde9c973994cb45b61d44Affected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before f3ce4d3f874ab7919edca364c147ac735f9f1d04Affected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 2bcad8fefcecdd5f005d8c550b25d703c063c34aAffected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 9fcbca0f801580cbb583e9cb274e2c7fbe766ca6Affected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before c665bef891e8972e1d3ce5bbc0d42a373346a2c3Affected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 8513411ec321942bd3cfed53d5bb700665c67d86Affected
3c4d7559159bfe1e3b94df3a657b2cda3a34e218 to before 5071a1e606b30c0c11278d3c6620cd6a24724cf6Affected

LinuxLinux

4.13Affected
before 4.13Not affected
5.10.237 through 5.10.*Not affected
5.15.181 through 5.15.*Not affected
6.1.135 through 6.1.*Not affected
6.6.88 through 6.6.*Not affected
6.12.24 through 6.12.*Not affected
6.13.12 through 6.13.*Not affected
6.14.3 through 6.14.*Not affected
6.15 and laterNot affected

References

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