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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/rt: Fix race in push_rt_task\n\nOverview\n========\nWhen a CPU chooses to call push_rt_task and picks a task to push to\nanother CPU\u0027s runqueue then it will call find_lock_lowest_rq method\nwhich would take a double lock on both CPUs\u0027 runqueues. If one of the\nlocks aren\u0027t readily available, it may lead to dropping the current\nrunqueue lock and reacquiring both the locks at once. During this window\nit is possible that the task is already migrated and is running on some\nother CPU. These cases are already handled. However, if the task is\nmigrated and has already been executed and another CPU is now trying to\nwake it up (ttwu) such that it is queued again on the runqeue\n(on_rq is 1) and also if the task was run by the same CPU, then the\ncurrent checks will pass even though the task was migrated out and is no\nlonger in the pushable tasks list.\n\nCrashes\n=======\nThis bug resulted in quite a few flavors of crashes triggering kernel\npanics with various crash signatures such as assert failures, page\nfaults, null pointer dereferences, and queue corruption errors all\ncoming from scheduler itself.\n\nSome of the crashes:\n-\u003e kernel BUG at kernel/sched/rt.c:1616! BUG_ON(idx \u003e= MAX_RT_PRIO)\n   Call Trace:\n   ? __die_body+0x1a/0x60\n   ? die+0x2a/0x50\n   ? do_trap+0x85/0x100\n   ? pick_next_task_rt+0x6e/0x1d0\n   ? do_error_trap+0x64/0xa0\n   ? pick_next_task_rt+0x6e/0x1d0\n   ? exc_invalid_op+0x4c/0x60\n   ? pick_next_task_rt+0x6e/0x1d0\n   ? asm_exc_invalid_op+0x12/0x20\n   ? pick_next_task_rt+0x6e/0x1d0\n   __schedule+0x5cb/0x790\n   ? update_ts_time_stats+0x55/0x70\n   schedule_idle+0x1e/0x40\n   do_idle+0x15e/0x200\n   cpu_startup_entry+0x19/0x20\n   start_secondary+0x117/0x160\n   secondary_startup_64_no_verify+0xb0/0xbb\n\n-\u003e BUG: kernel NULL pointer dereference, address: 00000000000000c0\n   Call Trace:\n   ? __die_body+0x1a/0x60\n   ? no_context+0x183/0x350\n   ? __warn+0x8a/0xe0\n   ? exc_page_fault+0x3d6/0x520\n   ? asm_exc_page_fault+0x1e/0x30\n   ? pick_next_task_rt+0xb5/0x1d0\n   ? pick_next_task_rt+0x8c/0x1d0\n   __schedule+0x583/0x7e0\n   ? update_ts_time_stats+0x55/0x70\n   schedule_idle+0x1e/0x40\n   do_idle+0x15e/0x200\n   cpu_startup_entry+0x19/0x20\n   start_secondary+0x117/0x160\n   secondary_startup_64_no_verify+0xb0/0xbb\n\n-\u003e BUG: unable to handle page fault for address: ffff9464daea5900\n   kernel BUG at kernel/sched/rt.c:1861! BUG_ON(rq-\u003ecpu != task_cpu(p))\n\n-\u003e kernel BUG at kernel/sched/rt.c:1055! BUG_ON(!rq-\u003enr_running)\n   Call Trace:\n   ? __die_body+0x1a/0x60\n   ? die+0x2a/0x50\n   ? do_trap+0x85/0x100\n   ? dequeue_top_rt_rq+0xa2/0xb0\n   ? do_error_trap+0x64/0xa0\n   ? dequeue_top_rt_rq+0xa2/0xb0\n   ? exc_invalid_op+0x4c/0x60\n   ? dequeue_top_rt_rq+0xa2/0xb0\n   ? asm_exc_invalid_op+0x12/0x20\n   ? dequeue_top_rt_rq+0xa2/0xb0\n   dequeue_rt_entity+0x1f/0x70\n   dequeue_task_rt+0x2d/0x70\n   __schedule+0x1a8/0x7e0\n   ? blk_finish_plug+0x25/0x40\n   schedule+0x3c/0xb0\n   futex_wait_queue_me+0xb6/0x120\n   futex_wait+0xd9/0x240\n   do_futex+0x344/0xa90\n   ? get_mm_exe_file+0x30/0x60\n   ? audit_exe_compare+0x58/0x70\n   ? audit_filter_rules.constprop.26+0x65e/0x1220\n   __x64_sys_futex+0x148/0x1f0\n   do_syscall_64+0x30/0x80\n   entry_SYSCALL_64_after_hwframe+0x62/0xc7\n\n-\u003e BUG: unable to handle page fault for address: ffff8cf3608bc2c0\n   Call Trace:\n   ? __die_body+0x1a/0x60\n   ? no_context+0x183/0x350\n   ? spurious_kernel_fault+0x171/0x1c0\n   ? exc_page_fault+0x3b6/0x520\n   ? plist_check_list+0x15/0x40\n   ? plist_check_list+0x2e/0x40\n   ? asm_exc_page_fault+0x1e/0x30\n   ? _cond_resched+0x15/0x30\n   ? futex_wait_queue_me+0xc8/0x120\n   ? futex_wait+0xd9/0x240\n   ? try_to_wake_up+0x1b8/0x490\n   ? futex_wake+0x78/0x160\n   ? do_futex+0xcd/0xa90\n   ? plist_check_list+0x15/0x40\n   ? plist_check_list+0x2e/0x40\n   ? plist_del+0x6a/0xd0\n   ? plist_check_list+0x15/0x40\n   ? plist_check_list+0x2e/0x40\n   ? dequeue_pushable_task+0x20/0x70\n   ? __schedule+0x382/0x7e0\n   ? asm_sysvec_reschedule_i\n---truncated---"
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The vulnerable code is the core RT scheduler\u0027s task-push balancing path, reached only by running tasks on the local system via scheduling activity (sched_setscheduler, affinity changes, futex wait/wake). There is no network-facing entry point.\nAC:L - Although this is a multi-CPU race, the attacker controls every participant \u2014 spawning RT threads, setting affinity masks to force rq overload and push_rt_task, generating rq-lock contention to widen the double_lock_balance window, and driving the dequeue/wakeup interleaving with tight futex loops \u2014 and can retry indefinitely; the commit notes it fires spontaneously under mere ordinary production load.\nPR:L - An unprivileged local account suffices in realistic deployments, since RLIMIT_RTPRIO is commonly granted to normal users (rtkit-daemon on desktop distros, audio group limits.conf, Android audio threads, container/systemd LimitRTPRIO), and on PREEMPT_RT systems the multi-CPU-affine RT IRQ threads can be driven by plain unprivileged I/O with no RT privilege at all.\nUI:N - The race is triggered entirely by the attacker\u0027s own thread activity and scheduler load; no victim action or interaction of any kind is required.\nS:U - The corruption is confined to kernel scheduler data structures within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unlocked cross-runqueue dequeue corrupts Y\u0027s plist and prio-array lists and desyncs its counters, so pick_next_rt_entity() type-confuses a list head into a struct sched_rt_entity and the scheduler reads an attacker-shapeable fake task_struct, yielding a kernel memory disclosure/read primitive.\nI:H - Concurrent unsynchronized list_del_init()/plist_del() on a runqueue whose lock is not held is a classic linked-list unlink write primitive, and the resulting bogus task_struct is written to and context-switched into, giving heap-shaping attackers a path to arbitrary write and control-flow hijack.\nA:H - The commit documents repeated kernel panics from this bug \u2014 BUG_ON(idx \u003e= MAX_RT_PRIO), BUG_ON(!rq-\u003enr_running), BUG_ON(rq-\u003ecpu != task_cpu(p)), NULL pointer dereferences, and kernel page faults \u2014 each a full system crash."
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          "url": "https://git.kernel.org/stable/c/690e47d1403e90b7f2366f03b52ed3304194c793"
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      "title": "sched/rt: Fix race in push_rt_task",
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    "dateReserved": "2025-04-16T04:51:23.996Z",
    "dateUpdated": "2026-08-05T12:00:34.386Z",
    "state": "PUBLISHED"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: ensure the received length does not exceed allocated size\n\nIn xdp_linearize_page, when reading the following buffers from the ring,\nwe forget to check the received length with the true allocate size. This\ncan lead to an out-of-bound read. This commit adds that missing check."
        }
      ],
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              "value": "AV:L - The attacker-controlled value is the used-ring length written by the virtio backend (hypervisor/VMM, vhost-user daemon, VDUSE device, or vDPA hardware), not anything carried in received network packets, so a remote peer cannot reach it. The attack is delivered over the local paravirtual transport, matching kernel CNA precedent for virtio device-supplied-length bugs (CVE-2026-64456, CVE-2026-46123).\nAC:L - The backend fully and deterministically controls both `hdr-\u003enum_buffers` and the used-ring `len`, with no race to win and no memory-layout guessing required; a single crafted RX completion triggers it every time. XDP attachment is a target configuration the backend can observe via the guest\u0027s headroom/GSO renegotiation, not an uncontrollable condition.\nPR:N - The malicious backend needs no credentials, account, or capability inside the victim guest \u2014 it simply completes a receive buffer with a bogus length. This matches the PR:N scoring used for the equivalent virtio_bt and hwrng-virtio device-length CVEs.\nUI:N - Triggering requires only that the driver process an RX completion in NAPI/softirq context, which happens automatically. No victim action of any kind is needed.\nS:U - The vulnerable component and the impacted component are both the virtio_net driver\u0027s own kernel, and a host-to-guest attack does not gain the attacker authority it did not already hold. This is not a guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - Each malformed completion copies up to ~3.5 KB of adjacent kernel memory into the linearized packet, which the XDP program can then XDP_TX/XDP_REDIRECT back to the attacker or which reaches userspace via a socket, giving a repeatable kernel memory disclosure channel. The integer-overflow variant extends the read arbitrarily far past the source buffer.\nI:H - The `page_off + buflen + tailroom \u003e PAGE_SIZE` guard is defeated by unsigned wraparound (verified: `buflen = 0xFFFFFD5C` makes the sum evaluate to 0), so the memcpy writes gigabytes beyond the single-page destination, corrupting arbitrary kernel heap memory. That is an out-of-bounds write, not merely the out-of-bounds read named in the commit message.\nA:H - Reading past the end of the source page, or the multi-gigabyte memcpy from the overflow variant, faults in softirq context and oopses/panics the kernel, and is instantly reproducible under KASAN or DEBUG_PAGEALLOC. The wholesale kernel memory corruption makes a crash the expected outcome."
            }
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        }
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        "dateUpdated": "2026-08-05T12:01:26.660Z",
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          "url": "https://git.kernel.org/stable/c/ddc8649d363141fb3371dd81a73e1cb4ef8ed1e1"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: ets: Always remove class from active list before deleting in ets_qdisc_change\n\nzdi-disclosures@trendmicro.com says:\n\nThe vulnerability is a race condition between `ets_qdisc_dequeue` and\n`ets_qdisc_change`.  It leads to UAF on `struct Qdisc` object.\nAttacker requires the capability to create new user and network namespace\nin order to trigger the bug.\nSee my additional commentary at the end of the analysis.\n\nAnalysis:\n\nstatic int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt,\n                          struct netlink_ext_ack *extack)\n{\n...\n\n      // (1) this lock is preventing .change handler (`ets_qdisc_change`)\n      //to race with .dequeue handler (`ets_qdisc_dequeue`)\n      sch_tree_lock(sch);\n\n      for (i = nbands; i \u003c oldbands; i++) {\n              if (i \u003e= q-\u003enstrict \u0026\u0026 q-\u003eclasses[i].qdisc-\u003eq.qlen)\n                      list_del_init(\u0026q-\u003eclasses[i].alist);\n              qdisc_purge_queue(q-\u003eclasses[i].qdisc);\n      }\n\n      WRITE_ONCE(q-\u003enbands, nbands);\n      for (i = nstrict; i \u003c q-\u003enstrict; i++) {\n              if (q-\u003eclasses[i].qdisc-\u003eq.qlen) {\n\t\t      // (2) the class is added to the q-\u003eactive\n                      list_add_tail(\u0026q-\u003eclasses[i].alist, \u0026q-\u003eactive);\n                      q-\u003eclasses[i].deficit = quanta[i];\n              }\n      }\n      WRITE_ONCE(q-\u003enstrict, nstrict);\n      memcpy(q-\u003eprio2band, priomap, sizeof(priomap));\n\n      for (i = 0; i \u003c q-\u003enbands; i++)\n              WRITE_ONCE(q-\u003eclasses[i].quantum, quanta[i]);\n\n      for (i = oldbands; i \u003c q-\u003enbands; i++) {\n              q-\u003eclasses[i].qdisc = queues[i];\n              if (q-\u003eclasses[i].qdisc != \u0026noop_qdisc)\n                      qdisc_hash_add(q-\u003eclasses[i].qdisc, true);\n      }\n\n      // (3) the qdisc is unlocked, now dequeue can be called in parallel\n      // to the rest of .change handler\n      sch_tree_unlock(sch);\n\n      ets_offload_change(sch);\n      for (i = q-\u003enbands; i \u003c oldbands; i++) {\n\t      // (4) we\u0027re reducing the refcount for our class\u0027s qdisc and\n\t      //  freeing it\n              qdisc_put(q-\u003eclasses[i].qdisc);\n\t      // (5) If we call .dequeue between (4) and (5), we will have\n\t      // a strong UAF and we can control RIP\n              q-\u003eclasses[i].qdisc = NULL;\n              WRITE_ONCE(q-\u003eclasses[i].quantum, 0);\n              q-\u003eclasses[i].deficit = 0;\n              gnet_stats_basic_sync_init(\u0026q-\u003eclasses[i].bstats);\n              memset(\u0026q-\u003eclasses[i].qstats, 0, sizeof(q-\u003eclasses[i].qstats));\n      }\n      return 0;\n}\n\nComment:\nThis happens because some of the classes have their qdiscs assigned to\nNULL, but remain in the active list. This commit fixes this issue by always\nremoving the class from the active list before deleting and freeing its\nassociated qdisc\n\nReproducer Steps\n(trimmed version of what was sent by zdi-disclosures@trendmicro.com)\n\n```\nDEV=\"${DEV:-lo}\"\nROOT_HANDLE=\"${ROOT_HANDLE:-1:}\"\nBAND2_HANDLE=\"${BAND2_HANDLE:-20:}\"   # child under 1:2\nPING_BYTES=\"${PING_BYTES:-48}\"\nPING_COUNT=\"${PING_COUNT:-200000}\"\nPING_DST=\"${PING_DST:-127.0.0.1}\"\n\nSLOW_TBF_RATE=\"${SLOW_TBF_RATE:-8bit}\"\nSLOW_TBF_BURST=\"${SLOW_TBF_BURST:-100b}\"\nSLOW_TBF_LAT=\"${SLOW_TBF_LAT:-1s}\"\n\ncleanup() {\n  tc qdisc del dev \"$DEV\" root 2\u003e/dev/null\n}\ntrap cleanup EXIT\n\nip link set \"$DEV\" up\n\ntc qdisc del dev \"$DEV\" root 2\u003e/dev/null || true\n\ntc qdisc add dev \"$DEV\" root handle \"$ROOT_HANDLE\" ets bands 2 strict 2\n\ntc qdisc add dev \"$DEV\" parent 1:2 handle \"$BAND2_HANDLE\" \\\n  tbf rate \"$SLOW_TBF_RATE\" burst \"$SLOW_TBF_BURST\" latency \"$SLOW_TBF_LAT\"\n\ntc filter add dev \"$DEV\" parent 1: protocol all prio 1 u32 match u32 0 0 flowid 1:2\ntc -s qdisc ls dev $DEV\n\nping -I \"$DEV\" -f -c \"$PING_COUNT\" -s \"$PING_BYTES\" -W 0.001 \"$PING_DST\" \\\n  \u003e/dev/null 2\u003e\u00261 \u0026\ntc qdisc change dev \"$DEV\" root handle \"$ROOT_HANDLE\" ets bands 2 strict 0\ntc qdisc change dev \"$DEV\" root handle \"$ROOT_HANDLE\" ets bands 2 strict 2\ntc -s qdisc ls dev $DEV\ntc qdisc del dev \"$DEV\" parent \n---truncated---"
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              "value": "AV:L - Exploitation requires local rtnetlink qdisc configuration and locally generated traffic reaching the ETS dequeue path.\nAC:L - The attacker controls both racing paths by issuing qdisc changes while driving packet dequeue, and can deterministically create the stale active-list state. Although the UAF window is narrow, preemptible, RT, or virtualized scheduling makes it plausible, and the higher-severity tie-break requires L.\nPR:L - RTM_NEWQDISC requires CAP_NET_ADMIN in the target network namespace. An unprivileged user can obtain that capability by creating user and network namespaces on deployments permitting unprivileged user namespaces.\nUI:N - No victim action is required after the attacker configures ETS and generates concurrent traffic.\nS:U - The corruption and resulting kernel compromise occur within the Linux kernel\u2019s existing security authority; standard namespace escape or kernel privilege escalation does not change CVSS scope.\nC:H - The freed Qdisc can be reclaimed with attacker-influenced contents and dereferenced through its operations pointer, supporting kernel memory disclosure primitives.\nI:H - The UAF reaches an indirect peek function call through the freed Qdisc operations pointer, making control-flow hijacking and arbitrary kernel modification defensible.\nA:H - The flaw demonstrably causes a KASAN use-after-free or NULL-pointer kernel oops and can produce a kernel panic."
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          "url": "https://git.kernel.org/stable/c/ce052b9402e461a9aded599f5b47e76bc727f7de"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()\n\nsyzbot was able to crash the kernel in rt6_uncached_list_flush_dev()\nin an interesting way [1]\n\nCrash happens in list_del_init()/INIT_LIST_HEAD() while writing\nlist-\u003eprev, while the prior write on list-\u003enext went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list-\u003enext, list); // This went well\n\tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul-\u003elock, as list_empty(\u0026rt-\u003edst.rt_uncached) returned\ntrue because the WRITE_ONCE(list-\u003enext, list) happened on the other CPU.\n\nWe might use list_del_init_careful() and list_empty_careful(),\nor make sure rt6_uncached_list_del() always grabs the spinlock\nwhenever rt-\u003edst.rt_uncached_list has been set.\n\nA similar fix is neeed for IPv4.\n\n[1]\n\n BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline]\n BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline]\n BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\nWrite of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450\n\nCPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: netns cleanup_net\nCall Trace:\n \u003cTASK\u003e\n  dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n  print_address_description mm/kasan/report.c:378 [inline]\n  print_report+0xca/0x240 mm/kasan/report.c:482\n  kasan_report+0x118/0x150 mm/kasan/report.c:595\n  INIT_LIST_HEAD include/linux/list.h:46 [inline]\n  list_del_init include/linux/list.h:296 [inline]\n  rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n  rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\n  addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853\n addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1\n  notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n  call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n  call_netdevice_notifiers net/core/dev.c:2282 [inline]\n  netif_close_many+0x29c/0x410 net/core/dev.c:1785\n  unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353\n  ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248\n  cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n \u003c/TASK\u003e\n\nAllocated by task 803:\n  kasan_save_stack mm/kasan/common.c:57 [inline]\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n  unpoison_slab_object mm/kasan/common.c:340 [inline]\n  __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366\n  kasan_slab_alloc include/linux/kasan.h:253 [inline]\n  slab_post_alloc_hook mm/slub.c:4953 [inline]\n  slab_alloc_node mm/slub.c:5263 [inline]\n  kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270\n  dst_alloc+0x105/0x170 net/core/dst.c:89\n  ip6_dst_alloc net/ipv6/route.c:342 [inline]\n  icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333\n  mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844\n  mld_send_cr net/ipv6/mcast.c:2154 [inline]\n  mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr\n---truncated---"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The vulnerable IPv4/IPv6 dst uncached-list paths are reachable through local network namespace operations and local packet/socket activity rather than unauthenticated remote packets alone. A local attacker can use user namespaces to obtain CAP_NET_ADMIN in a new network namespace and drive route creation plus device/netns teardown.\nAC:L - The bug is a race, but the attacker can plausibly control both sides by repeatedly creating/freeing uncached dst objects and concurrently tearing down devices or network namespaces. No rare external condition is required beyond normal kernel scheduling.\nPR:L - The relevant device and route teardown paths require CAP_NET_ADMIN, but rtnetlink checks it against the target network namespace user_ns. An unprivileged local user can obtain those capabilities in a user-created network namespace on systems allowing user namespaces.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an action. The attacker can trigger the route allocation/free and teardown sequence directly.\nS:U - The corruption occurs inside the host kernel networking stack and impacts resources governed by the same kernel security authority. It is not a guest-to-host escape or other cross-scope boundary bypass.\nC:H - This is a slab use-after-free involving dst/route objects, and kernel UAF memory corruption can be leveraged with heap shaping for disclosure primitives. When uncertain, the higher severity confidentiality impact is appropriate.\nI:H - The race causes a write through list_del_init into freed route memory, creating kernel heap corruption. Such UAF writes are plausibly exploitable for arbitrary write or control-flow corruption, so integrity impact is high.\nA:H - The upstream report demonstrates a KASAN slab-use-after-free crash in rt6_uncached_list_flush_dev during netns cleanup. Repeated triggering can crash or destabilize the kernel."
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    "dateReserved": "2026-05-01T14:12:56.014Z",
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