alsa-2026:25120
Vulnerability from osv_almalinux
Published
2026-06-10 00:00
Modified
2026-06-11 08:42
Summary
Critical: kernel-rt security update
Details

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: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)
  • kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)
  • kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)
  • kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)
  • kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)
  • kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)
  • kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
  • kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)
  • kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)
  • kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)
  • kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
  • kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852)
  • kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)

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.

References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-modules"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-modules-extra"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-modules"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-modules-extra"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.132.1.rt7.473.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.  \n\nSecurity Fix(es):  \n\n  * kernel: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)\n  * kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)\n  * kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)\n  * kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)\n  * kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)\n  * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)\n  * kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)\n  * kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)\n  * kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err() (CVE-2026-43037)\n  * kernel: ipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)\n  * kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)\n  * kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852)\n  * kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)\n\n\nFor 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.\n",
  "id": "ALSA-2026:25120",
  "modified": "2026-06-11T08:42:31Z",
  "published": "2026-06-10T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:25120"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-53781"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2025-21858"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2025-68366"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-22984"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-22990"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-23392"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-31581"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-31613"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43037"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43038"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43125"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-45852"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46181"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2351619"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2420279"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2424881"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2432389"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2432400"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2451218"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2461471"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2461480"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464351"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464397"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467234"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2482166"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2482532"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-25120.html"
    }
  ],
  "related": [
    "CVE-2025-21858",
    "CVE-2023-53781",
    "CVE-2025-68366",
    "CVE-2026-22984",
    "CVE-2026-22990",
    "CVE-2026-23392",
    "CVE-2026-31581",
    "CVE-2026-31613",
    "CVE-2026-43037",
    "CVE-2026-43038",
    "CVE-2026-43125",
    "CVE-2026-45852",
    "CVE-2026-46181"
  ],
  "summary": "Critical: kernel-rt security update"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.