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rxrpc: Fix recvmsg() unconditional requeue

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.

Announced Source revision 1
Original source ↗

CVE-2026-23066

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-2026-23066

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.

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    "vendor": "Linux",
    "product": "Linux",
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        "version": "540b1c48c37ac0ad66212004db21e1ff7e2d78be",
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        "versionType": "git"
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      }
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    "programFiles": [
      "include/trace/events/rxrpc.h",
      "net/rxrpc/recvmsg.c"
    ],
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  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "4.11"
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      {
        "status": "unaffected",
        "version": "0",
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        "versionType": "semver"
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        "status": "unaffected",
        "version": "5.10.258",
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        "lessThanOrEqual": "5.10.*"
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        "status": "unaffected",
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        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
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        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
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      },
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        "version": "6.12.78",
        "versionType": "semver",
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        "status": "unaffected",
        "version": "6.18.8",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/trace/events/rxrpc.h",
      "net/rxrpc/recvmsg.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23066

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39736 · Revision 1
Added to Heist Feed
Publisher date
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