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CriticalFix available

CVE-2026-74688 affecting package kernel for versions less than 6.6.152.1-1

Type: advisorySource: OSV1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.

Announced Source revision 1
Original source ↗

AZL-97196

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: osv:AZL-97196

kernel

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
6.6.152.1-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.6.152.1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "kernel",
      "purl": "pkg:rpm/azure-linux/kernel",
      "ecosystem": "Azure Linux:3"
    },
    "database_specific": {
      "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-97196.json"
    }
  }
]
Related CVEs
CVE-2026-74688

Source reference: /upstream

Publisher severity

No explicit severity was provided.

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-74688 · Critical

Linux, Linux

Event
#68692 · Revision 1
Added to Heist Feed
Publisher date
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