net: tls: explicitly disallow disconnect
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: 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
CVE-2025-37756
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-37756
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "ac91c6125468be720eafde9c973994cb45b61d44",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "f3ce4d3f874ab7919edca364c147ac735f9f1d04",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "2bcad8fefcecdd5f005d8c550b25d703c063c34a",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "9fcbca0f801580cbb583e9cb274e2c7fbe766ca6",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "c665bef891e8972e1d3ce5bbc0d42a373346a2c3",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "8513411ec321942bd3cfed53d5bb700665c67d86",
"versionType": "git"
},
{
"status": "affected",
"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
"lessThan": "5071a1e606b30c0c11278d3c6620cd6a24724cf6",
"versionType": "git"
}
],
"programFiles": [
"net/tls/tls_main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.237",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.181",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.135",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.88",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.24",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.12",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14.3",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/tls/tls_main.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-37756
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30470 · Revision 1
- Added to Heist Feed
- Publisher date