ESB-2026.6501

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.6501 kernel security update 11 June 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-45852 CVE-2025-21858 CVE-2023-53781 CVE-2025-68366 CVE-2026-43037 CVE-2026-43038 CVE-2026-22984 CVE-2026-43125 CVE-2026-22990 CVE-2026-46181 CVE-2026-23392 CVE-2026-31613 CVE-2026-31581 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:25121 Comment: CVSS (Max): 8.8 CVE-2026-43037 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H EPSS (Max): 0.1% (26th) CVE-2026-43037 2026-06-10 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:25121 - Security Advisory Issued: 2026-06-10 Updated: 2026-06-10 Synopsis Kernel security update Type/Severity Security Advisory: Critical Topic An update for kernel is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): o kernel: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858) o kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781) o kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366) o kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done () (CVE-2026-22984) o kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990) o kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392) o kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581) o kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613) o kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037) o kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038) o kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125) o kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852) o 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Affected Products o Red Hat Enterprise Linux for IBM z Systems 8 s390x o Red Hat Enterprise Linux for Power, little endian 8 ppc64le o Red Hat CodeReady Linux Builder for x86_64 8 x86_64 o Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le o Red Hat CodeReady Linux Builder for ARM 64 8 aarch64 o Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le o Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x Fixes o BZ - 2351619 - CVE-2025-21858 kernel: geneve: Fix use-after-free in geneve_find_dev(). o BZ - 2420279 - CVE-2023-53781 kernel: smc: Fix use-after-free in tcp_write_timer_handler() o BZ - 2424881 - CVE-2025-68366 kernel: nbd: defer config unlock in nbd_genl_connect o BZ - 2432389 - CVE-2026-22984 kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() o BZ - 2432400 - CVE-2026-22990 kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() o BZ - 2451218 - CVE-2026-23392 kernel: netfilter: nf_tables: release flowtable after rcu grace period on error o BZ - 2461471 - CVE-2026-31581 kernel: ALSA: 6fire: fix use-after-free on disconnect o BZ - 2461480 - CVE-2026-31613 kernel: smb: client: fix OOB reads parsing symlink error response o BZ - 2464351 - CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() o BZ - 2464397 - CVE-2026-43038 kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() o BZ - 2467234 - CVE-2026-43125 kernel: dlm: validate length in dlm_search_rsb_tree o BZ - 2482166 - CVE-2026-45852 kernel: RDMA/rxe: Fix double free in rxe_srq_from_init o BZ - 2482532 - CVE-2026-46181 kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() CVEs o CVE-2023-53781 o CVE-2025-21858 o CVE-2025-68366 o CVE-2026-22984 o CVE-2026-22990 o CVE-2026-23392 o CVE-2026-31581 o CVE-2026-31613 o CVE-2026-43037 o CVE-2026-43038 o CVE-2026-43125 o CVE-2026-45852 o CVE-2026-46181 References o https://access.redhat.com/security/updates/classification/#critical - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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