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net: tls: explicitly disallow disconnect

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

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
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