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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Clear Present bit before tearing down context entry\n\nWhen tearing down a context entry, the current implementation zeros the\nentire 128-bit entry using multiple 64-bit writes. This creates a window\nwhere the hardware can fetch a \"torn\" entry \u2014 where some fields are\nalready zeroed while the \u0027Present\u0027 bit is still set \u2014 leading to\nunpredictable behavior or spurious faults.\n\nWhile x86 provides strong write ordering, the compiler may reorder writes\nto the two 64-bit halves of the context entry. Even without compiler\nreordering, the hardware fetch is not guaranteed to be atomic with\nrespect to multiple CPU writes.\n\nAlign with the \"Guidance to Software for Invalidations\" in the VT-d spec\n(Section 6.5.3.3) by implementing the recommended ownership handshake:\n\n1. Clear only the \u0027Present\u0027 (P) bit of the context entry first to\n   signal the transition of ownership from hardware to software.\n2. Use dma_wmb() to ensure the cleared bit is visible to the IOMMU.\n3. Perform the required cache and context-cache invalidation to ensure\n   hardware no longer has cached references to the entry.\n4. Fully zero out the entry only after the invalidation is complete.\n\nAlso, add a dma_wmb() to context_set_present() to ensure the entry\nis fully initialized before the \u0027Present\u0027 bit becomes visible."
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          "url": "https://git.kernel.org/stable/c/c1e4f1dccbe9d7656d1c6872ebeadb5992d0aaa2"
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    "datePublished": "2026-05-27T12:18:00.481Z",
    "dateReserved": "2026-05-13T15:03:33.087Z",
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Drop all SCM attributes for SOCKMAP.\n\nSOCKMAP can hide inflight fd from AF_UNIX GC.\n\nWhen a socket in SOCKMAP receives skb with inflight fd,\nsk_psock_verdict_data_ready() looks up the mapped socket and\nenqueue skb to its psock-\u003eingress_skb.\n\nSince neither the old nor the new GC can inspect the psock\nqueue, the hidden skb leaks the inflight sockets.  Note that\nthis cannot be detected via kmemleak because inflight sockets\nare linked to a global list.\n\nIn addition, SOCKMAP redirect breaks the Tarjan-based GC\u0027s\nassumption that unix_edge.successor is always alive, which\nis no longer true once skb is redirected, resulting in\nuse-after-free below. [0]\n\nMoreover, SOCKMAP does not call scm_stat_del() properly,\nso unix_show_fdinfo() could report an incorrect fd count.\n\nsk_msg_recvmsg() does not support any SCM attributes in the\nfirst place.\n\nLet\u0027s drop all SCM attributes before passing skb to the\nSOCKMAP layer.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\nRead of size 8 at addr ffff888125362670 by task kworker/56:1/496\n\nCPU: 56 UID: 0 PID: 496 Comm: kworker/56:1 Not tainted 7.0.0-rc7-00263-gb9d8b856689d #3 PREEMPT(lazy)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\nWorkqueue: events sk_psock_backlog\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:122)\n print_report (mm/kasan/report.c:379)\n kasan_report (mm/kasan/report.c:597)\n unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\n unix_destroy_fpl (net/unix/garbage.c:317)\n unix_destruct_scm (./include/net/scm.h:80 ./include/net/scm.h:86 net/unix/af_unix.c:1976)\n sk_psock_backlog (./include/linux/skbuff.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)\n \u003c/TASK\u003e\n\nAllocated by task 955:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n __kasan_slab_alloc (mm/kasan/common.c:369)\n kmem_cache_alloc_noprof (mm/slub.c:4539)\n sk_prot_alloc (net/core/sock.c:2240)\n sk_alloc (net/core/sock.c:2301)\n unix_create1 (net/unix/af_unix.c:1099)\n unix_create (net/unix/af_unix.c:1169)\n __sock_create (net/socket.c:1606)\n __sys_socketpair (net/socket.c:1811)\n __x64_sys_socketpair (net/socket.c:1863 net/socket.c:1860 net/socket.c:1860)\n do_syscall_64 (arch/x86/entry/syscall_64.c:?)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 496:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n kasan_save_free_info (mm/kasan/generic.c:587)\n __kasan_slab_free (mm/kasan/common.c:287)\n kmem_cache_free (mm/slub.c:6165)\n __sk_destruct (net/core/sock.c:2282 net/core/sock.c:2384)\n sk_psock_destroy (./include/net/sock.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)"
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              "value": "AV:L - The vulnerable AF_UNIX SOCKMAP path is reached through local syscalls such as bpf(), socketpair(), map update/attach, and sendmsg() with SCM_RIGHTS; remote network peers cannot pass AF_UNIX file descriptors into this path.\nAC:L - The attacker can create the sockets, install the SOCKMAP verdict redirect, send SCM_RIGHTS, and close/tear down the involved sockets; any timing involved is under attacker control.\nPR:L - Triggering requires creating/attaching SK_SKB SOCKMAP BPF objects, gated by CAP_BPF/CAP_NET_ADMIN or delegated BPF token access. In a reasonable namespaced/delegated BPF deployment this is low privilege rather than host-root-only.\nUI:N - No victim action is required after the attacker has local access and the needed BPF privileges; the trigger is entirely attacker-driven.\nS:U - The vulnerability is in the host kernel AF_UNIX/SOCKMAP implementation and impacts the same kernel security authority. This is standard kernel memory corruption/DoS rather than a hypervisor or device isolation boundary escape.\nC:H - The bug produces a use-after-free on AF_UNIX socket/SCM graph state after SOCKMAP hides redirected skb SCM attributes. Per kernel scoring guidance, UAF memory corruption is treated as capable of high confidentiality impact.\nI:H - The freed socket/graph state can be reused while kernel GC follows stale pointers, making this memory corruption potentially exploitable beyond a simple crash. Per guidance, UAF is scored as high integrity impact.\nA:H - The reported failure is a KASAN slab-use-after-free in AF_UNIX GC/workqueue processing, and the hidden inflight-fd skb state can also leak socket references. This can cause kernel oops/panic or sustained resource exhaustion."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: cancel pending_rx_work before taking conn-\u003elock\n\nl2cap_conn_del() takes conn-\u003elock and then calls cancel_work_sync() for\npending_rx_work.  process_pending_rx() takes the same mutex, so teardown\ncan deadlock against the worker it is flushing.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the l2cap_conn_ready() -\u003e queue_work(...,\n\u0026conn-\u003epending_rx_work) submit path, the l2cap_conn_del() -\u003e\ncancel_work_sync(\u0026conn-\u003epending_rx_work) teardown path, and the\nprocess_pending_rx() -\u003e mutex_lock(\u0026conn-\u003elock) worker edge.  Lockdep\n\n  WARNING: possible circular locking dependency detected\n  process_pending_rx+0x21/0x2a [vuln_msv]\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\n  *** DEADLOCK ***\n\nCancel pending_rx_work before taking conn-\u003elock, matching the existing\nlock-before-drain ordering used for the two delayed works in the same\nteardown path.  The pending_rx queue is still purged after the work has\nbeen cancelled and conn-\u003elock has been acquired."
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              "value": "AV:A - A nearby Bluetooth peer can reach the flaw by establishing an ACL or LE link and supplying L2CAP traffic while forcing connection teardown.\nAC:L - The attacker controls connection establishment, queued traffic, and link termination, and can repeat attempts to win the workqueue race.\nPR:N - The vulnerable link-bring-up and teardown paths are reachable before Bluetooth pairing or authentication and require no attacker privileges.\nUI:N - No victim action is required once the Bluetooth interface is enabled and accepting connections.\nS:U - The vulnerable L2CAP code and the affected kernel resources belong to the same security authority.\nC:H - If the worker has started, work_pending() can be false and teardown can skip synchronization, free the l2cap_conn, and leave process_pending_rx() accessing reclaimed memory, creating an exploitable heap use-after-free.\nI:H - The resumed worker performs mutex and queue operations on the freed, potentially reallocated l2cap_conn, permitting heap corruption and potentially attacker-controlled writes or control-flow hijacking.\nA:H - The documented lock inversion can permanently deadlock connection teardown and the Bluetooth workqueue; the associated use-after-free can also crash or panic the kernel."
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