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

{
  "id": "acfd3324954042fc86331c0b860b9fbbac07e659eeeaae9dbe3581c2f63b496b",
  "url": "https://osv.dev/vulnerability/RLSA-2026%3A89082",
  "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: tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236) * kernel: fuse: re-lock request before replacing page cache folio (CVE-2026-53388) * kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs() (CVE-2026-64378) * kernel: net: gro: fix double aggregation of flush-marked skbs (CVE-2026-68136) * kernel: net/packet: avoid fanout hook re-registration after unregister (CVE-2026-68338) * kernel: net/iucv: fix use-after-free of a severed iucv_path (CVE-2026-68140) * kernel: net/sched: serialize qdisc_rtab_list against concurrent get/put (CVE-2026-68138) * kernel: ipvs: reload ip header after head reallocation (CVE-2026-68476) * kernel: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() (CVE-2026-72242) * kernel: mptcp: options: reset DSS fields in case of unexpected size (CVE-2026-80586) * kernel: usb: usbfs: fix use-after-free of usb_device in usbdev_release() (CVE-2026-80824) * kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638) * kernel: net/iucv: filter frames in afiucv_hs_rcv() by ingress device (CVE-2026-81003) * kernel: ipv4: validate checksum_start before completing checksum (CVE-2026-99999) Bug Fix(es) and Enhancement(s): * Backport 6785011f8b16 (\"ipv4: validate checksum_start before completin",
    "evidence": "osv:RLSA-2026:89082",
    "products": [
      {
        "name": {
          "value": "kernel-rt",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:4.18.0-553.178.1.rt7.519.el8_10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RLSA-2026:89082",
      "aliases": [
        "RLSA-2026:89082"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:4.18.0-553.178.1.rt7.519.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-2026:89082.json"
          }
        }
      ],
      "modified": "2026-10-27T00:30:02.845913761Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-53236",
        "CVE-2026-53388",
        "CVE-2026-64378",
        "CVE-2026-68136",
        "CVE-2026-68138",
        "CVE-2026-68140",
        "CVE-2026-68338",
        "CVE-2026-68476",
        "CVE-2026-72242",
        "CVE-2026-80586",
        "CVE-2026-80824",
        "CVE-2026-81003",
        "CVE-2026-89638",
        "CVE-2026-99999"
      ],
      "references": [
        "https://errata.rockylinux.org/RLSA-2026:89082",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492709",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2502255",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2507296",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2513163",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2513264",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2513293",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2513343",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2516251",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2516417",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2524438",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2528642",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2532122",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2532515",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2553429",
        "https://access.redhat.com/errata/RHSA-2026:89082"
      ],
      "provider_metadata": {
        "license": "CC-BY-4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "source_advisory": "RHSA-2026:89082"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53236",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-53388",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-64378",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-68136",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-68138",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-68140",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-68338",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-68476",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-72242",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-80586",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-80824",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-81003",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-89638",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-99999",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 459033,
  "published_at": "2026-10-27T00:01:58.067258+00:00"
}