Important: kernel-rt security, bug fix, and enhancement update

{
  "id": "c4bf526deb7c1340d5dbb26f7e14ddd773c02e6d6cecb3debdef03bf71751d07",
  "url": "https://osv.dev/vulnerability/RLSA-2026%3A85774",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Important: kernel-rt security, bug fix, and enhancement update",
    "summary": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: xfrm: espintcp: do not reuse an in-progress partial send (CVE-2026-52935) * kernel: USB: serial: io_ti: fix heap overflow in get_manuf_info() (CVE-2026-53196) * kernel: sctp: keep chunk->transport in step with the list it is queued on (CVE-2026-74588) * kernel: sctp: validate cookie AUTH state before use (CVE-2026-74752) * kernel: smb: client: reject a tree connect response whose byte count is too small (CVE-2026-89631) * kernel: sctp: stop processing a packet once its association is deleted (CVE-2026-89479) * kernel: perf: Fix addr_filter_ranges lifetime (CVE-2026-93817) * kernel: netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state (CVE-2026-93288) * kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation () * kernel: netfilter: flowtable: hold reference on ct until flow is released (CVE-2026-98320) Bug Fix(es) and Enhancement(s): * gfs2 filesystem withdrawal rework [Rocky Linux-8] (JIRA:Rocky Linux-129363) * Batch: z-stream xfrm - rhel-8.10.z (NST-Core-26W38) (JIRA:Rocky Linux-256684) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
    "evidence": "osv:RLSA-2026:85774",
    "products": [
      {
        "name": {
          "value": "kernel-rt",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:4.18.0-553.176.1.rt7.517.el8_10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RLSA-2026:85774",
      "aliases": [
        "RLSA-2026:85774"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:4.18.0-553.176.1.rt7.517.el8_10"
                }
              ],
              "database_specific": {
                "yum_repository": "NFV"
              }
            }
          ],
          "package": {
            "name": "kernel-rt",
            "purl": "pkg:rpm/rocky-linux/kernel-rt?distro=rocky-linux-8&epoch=0",
            "ecosystem": "Rocky Linux:8"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/resf-osv-data/RLSA-2026:85774.json"
          }
        }
      ],
      "modified": "2026-10-21T07:15:06.178118079Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-52935",
        "CVE-2026-53196",
        "CVE-2026-74588",
        "CVE-2026-74752",
        "CVE-2026-89479",
        "CVE-2026-89631",
        "CVE-2026-93288",
        "CVE-2026-93817",
        "CVE-2026-98320"
      ],
      "references": [
        "https://errata.rockylinux.org/RLSA-2026:85774",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492098",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492750",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2521384",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2524422",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2532089",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2532290",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2540391",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2540500",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2546494",
        "https://access.redhat.com/errata/RHSA-2026:85774"
      ],
      "provider_metadata": {
        "license": "CC-BY-4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "source_advisory": "RHSA-2026:85774"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52935",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-53196",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-74588",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-74752",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-89479",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-89631",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-93288",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-93817",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-98320",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 391625,
  "published_at": "2026-10-21T06:38:15.230306+00:00"
}