{ "cveId": "CVE-2026-45845", "url": "https://patchblox.com/security/cve/CVE-2026-45845", "summary": "CVE-2026-45845 is fixed in 14 products on 1 platform, first by DEBIAN-CVE-2026-45845, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: fix NULL pointer dereference...", "description": "In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: fix NULL pointer dereference in class dump When a TAPRIO child qdisc is deleted via RTM_DELQDISC, taprio_graft() is called with new == NULL and stores NULL into q-\u003Eqdiscs[cl - 1]. Subsequent RTM_GETTCLASS dump operations walk all classes via taprio_walk() and call taprio_dump_class(), which calls taprio_leaf() returning the NULL pointer, then dereferences it to read child-\u003Ehandle, causing a kernel NULL pointer dereference. The bug is reachable with namespace-scoped CAP_NET_ADMIN on any kernel with CONFIG_NET_SCH_TAPRIO enabled. On systems with unprivileged user namespaces enabled, an unprivileged local user can trigger a kernel panic by creating a taprio qdisc inside a new network namespace, grafting an explicit child qdisc, deleting it, and requesting a class dump. The RTM_GETTCLASS dump itself requires no capability. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] RIP: 0010:taprio_dump_class (net/sched/sch_taprio.c:2478) Call Trace: \u003CTASK\u003E tc_fill_tclass (net/sched/sch_api.c:1966) qdisc_class_dump (net/sched/sch_api.c:2326) taprio_walk (net/sched/sch_taprio.c:2514) tc_dump_tclass_qdisc (net/sched/sch_api.c:2352) tc_dump_tclass_root (net/sched/sch_api.c:2370) tc_dump_tclass (net/sched/sch_api.c:2431) rtnl_dumpit (net/core/rtnetlink.c:6864) netlink_dump (net/netlink/af_netlink.c:2325) rtnetlink_rcv_msg (net/core/rtnetlink.c:6959) netlink_rcv_skb (net/netlink/af_netlink.c:2550) \u003C/TASK\u003E Fix this by substituting \u0026noop_qdisc when new is NULL in taprio_graft(), a common pattern used by other qdiscs (e.g., multiq_graft()) to ensure the q-\u003Eqdiscs[] slots are never NULL. This makes control-plane dump paths safe without requiring individual NULL checks. Since the data-plane paths (taprio_enqueue and taprio_dequeue_from_txq) previously had explicit NULL guards that would drop/skip the packet cleanly, update those checks to test for \u0026noop_qdisc instead. Without this, packets would reach taprio_enqueue_one() which increments the root qdisc\u0027s qlen and backlog before calling the child\u0027s enqueue; noop_qdisc drops the packet but those counters are never rolled back, permanently inflating the root qdisc\u0027s statistics. After this change *old can be a valid qdisc, NULL, or \u0026noop_qdisc. Only call qdisc_put(*old) in the first case to avoid decreasing noop_qdisc\u0027s refcount, which was never increased.", "published": "2026-05-27T11:16:23Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.0012, "epssPercentile": 0.01813, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-azure", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-default", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23237-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23237-1", "released": "2026-08-11T21:34:22Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1.160000.2.19", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1.160000.2.19", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-docs", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-docs", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-kvmsmall", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-kvmsmall", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-obs-build", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-obs-qa", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-obs-qa", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-rt", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-source", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-source", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-syms", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-syms", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "kernel-zfcpdump", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "OPENSUSE-SU-2026:21555-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1", "released": "2026-08-12T01:09:28Z" }, { "platform": "linux", "product": "kernel-zfcpdump", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.37.1", "fix": "SUSE-SU-2026:23231-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1", "released": "2026-08-11T21:26:34Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.12.94-1", "fix": "DEBIAN-CVE-2026-45845", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45845", "released": "2026-06-24T14:07:24Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.0.10-1", "fix": "DEBIAN-CVE-2026-45845", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45845", "released": "2026-06-24T14:07:24Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T00:53:09Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }