CVE-2025-37756net: tls: explicitly disallow disconnect
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before 7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before ac91c6125468be720eafde9c973994cb45b61d44; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before f3ce4d3f874ab7919edca364c147ac735f9f1d04; 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 builds before 2bcad8fefcecdd5f005d8c550b25d703c063c34a; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before 9fcbca0f801580cbb583e9cb274e2c7fbe766ca6; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before c665bef891e8972e1d3ce5bbc0d42a373346a2c3; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before 8513411ec321942bd3cfed53d5bb700665c67d86; from 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 before 5071a1e606b30c0c11278d3c6620cd6a24724cf6 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.13 before 5.10.237; from 5.11 before 5.15.181; from 5.16 before 6.1.135; from 6.2 before 6.6.88; from 6.7 before 6.12.24; from 6.13 before 6.13.12; from 6.14 before 6.14.3; 6.15 | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cfpatch
- https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44patch
- https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04patch
- https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34apatch
- https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6patch
- https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3patch
- https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86patch
- https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6patch
- http://www.openwall.com/lists/oss-security/2026/05/07/1
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlmailing-list
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlmailing-list
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.