Threats Tagged 'cve-2026-63946'

This Red Hat security advisory addresses multiple vulnerabilities and bug fixes in the Linux kernel packages for Red Hat Enterprise Linux 8 and 9. It includes a denial of service vulnerability in the qla2xxx SCSI driver (CVE-2025-68745) and several other security issues affecting Bluetooth, DRM, SCTP, Wi-Fi, and other kernel subsystems. The update is rated as important by Red Hat and requires a system reboot to apply. The advisory also contains non-security bug fixes and enhancements.

This Red Hat security advisory addresses multiple vulnerabilities and bug fixes in the Linux kernel, including a denial of service vulnerability in the qla2xxx SCSI driver (CVE-2025-68745) and numerous other issues affecting various kernel subsystems such as Bluetooth, DRM, SCTP, Wi-Fi, and more. The advisory covers security fixes, bug fixes, and enhancements for Red Hat Enterprise Linux 9 and related components. A patch is available to remediate these issues.

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation (CVE-2026-43133) * kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339) * kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests (CVE-2026-43493) * kernel: tcp: call sk_data_ready() after listener migration (CVE-2026-46015) * kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() (CVE-2026-46149) * kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266) * kernel: flow_dissector: do not dissect PPPoE PFC frames (CVE-2026-46306) * kernel: Revert "net/smc: Introduce TCP ULP support" (CVE-2026-46330) * kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002) * kernel: net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223) * kernel: ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275) * kernel: ipv4: account for fraggap on the paged allocation path (CVE-2026-53366) * kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034) * kernel: rhashtable: clear stale iter->p on table restart (CVE-2026-64563) * kernel: smb: client: fix double-free in SMB2_close() replay (CVE-2026-64597) * kernel: nvmet-rdma: handle inline data with a nonzero offset (CVE-2026-72129) * kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480) Bug Fix(es) and Enhancement(s): * KSM to deduplicate only zero pages [rhel-9.8.z] (JIRA:RHEL-249161) 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.

A use-after-free vulnerability in the Linux kernel Bluetooth ISO subsystem (CVE-2026-63946) has been resolved. The flaw occurs in the iso_recv_frame function where a pointer to a socket structure is used after the associated lock is released, allowing a concurrent operation to free the socket and cause use-after-free on socket state and queue functions. This vulnerability has a high severity with a CVSS score of 8.8 and affects multiple Linux kernel versions. A patch is available that replaces the unsafe pointer usage with a reference-counted hold operation to prevent the use-after-free condition.

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.