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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix race condition in hidp_session_thread\n\nThere is a potential race condition in hidp_session_thread that may\nlead to use-after-free. For instance, the timer is active while\nhidp_del_timer is called in hidp_session_thread(). After hidp_session_put,\nthen \u0027session\u0027 will be freed, causing kernel panic when hidp_idle_timeout\nis running.\n\nThe solution is to use del_timer_sync instead of del_timer.\n\nHere is the call trace:\n\n? hidp_session_probe+0x780/0x780\ncall_timer_fn+0x2d/0x1e0\n__run_timers.part.0+0x569/0x940\nhidp_session_probe+0x780/0x780\ncall_timer_fn+0x1e0/0x1e0\nktime_get+0x5c/0xf0\nlapic_next_deadline+0x2c/0x40\nclockevents_program_event+0x205/0x320\nrun_timer_softirq+0xa9/0x1b0\n__do_softirq+0x1b9/0x641\n__irq_exit_rcu+0xdc/0x190\nirq_exit_rcu+0xe/0x20\nsysvec_apic_timer_interrupt+0xa1/0xc0"
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              "value": "AV:A - The vulnerable HIDP session and its idle timer are driven entirely by a Bluetooth peer\u0027s traffic and link teardown, so the attacker must be within Bluetooth radio range of the host. Bluetooth-reachable code is scored Adjacent.\nAC:L - The attacker controls both sides of the race: the idle timer is re-armed on every input report it sends (so expiry timing is known precisely), and it triggers the session-thread exit at that exact moment via an L2CAP disconnect or a VIRTUAL_CABLE_UNPLUG control message. The attempt can be repeated indefinitely by reconnecting.\nPR:N - The attacker needs no account or privileges on the target host; it acts purely as a Bluetooth HID peripheral, and Linux HID hosts of this era accepted HID connections from unbonded peers. All required actions are ordinary HIDP protocol traffic.\nUI:N - The HIDP session is established and torn down by the Bluetooth daemon automatically in response to the peer\u0027s connection and its subsequent disconnect/unplug; no victim action is required at any point.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - hidp_idle_timeout() reads pointer fields (intr_sock/ctrl_sock) out of the freed hidp_session and follows them, and the resulting UAF primitive over a plain-kfree\u0027d heap object can be leveraged with heap grooming to disclose arbitrary kernel memory.\nI:H - The callback writes EUNATCH through a pointer read from freed memory and performs wake_up_interruptible() on a waitqueue head taken from that freed object, giving both a controlled write and an indirect call through an attacker-groomable function pointer \u2014 sufficient for control-flow hijack.\nA:H - The reported symptom is a kernel panic from the timer callback running against a freed session; any such use-after-free reliably oopses the kernel and can be triggered repeatedly by a nearby device."
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          "url": "https://git.kernel.org/stable/c/c95930abd687fcd1aa040dc4fe90dff947916460"
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      "title": "Bluetooth: Fix race condition in hidp_session_thread",
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              "value": "AV:A - The vulnerable window is opened and closed by a remote Bluetooth peer over an L2CAP/RFCOMM/LE CoC connection, which requires only radio proximity to the target. Per kernel scoring convention Bluetooth-reachable bugs are Adjacent.\nAC:L - The attacker controls both sides of the race: withholding L2CAP credits (or ACL buffers) parks the sender in the blocking `bt_skb_send_alloc()` with the chan lock released for an unbounded time, and the attacker then terminates the link to run `l2cap_conn_del()`/`kfree(conn)` inside that window. This makes the race deterministic rather than dependent on timing luck.\nPR:N - No local account and no privileges are needed \u2014 the sending side is the kernel\u0027s own RFCOMM session or a system Bluetooth daemon, and L2CAP/LE CoC channels at BT_SECURITY_LOW accept connections without pairing or authentication. The attacker is purely an unauthenticated adjacent device.\nUI:N - Exploitation needs only a connectable/discoverable target or an already-established profile connection; the freed-conn dereference happens entirely within normal send and link-teardown handling. No victim action is required.\nS:U - The corruption and its consequences are confined to the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety issue.\nC:H - This is a use-after-free read of a freed `struct l2cap_conn` slab object whose contents the attacker can influence by reclaiming the slot with heap spray, and the value read (`conn-\u003emtu`) feeds fragment sizing and copy loops. UAF of an attacker-groomable object is treated as enabling arbitrary read.\nI:H - The dangling `l2cap_conn` is used to drive skb allocation and fragmentation while the freed slab is attacker-reclaimable, giving heap-grooming leverage over subsequent kernel allocations and control-flow-relevant state. Per kernel guidance a use-after-free is scored as exploitable for arbitrary write/control-flow hijack.\nA:H - The freed-object read reliably oopses under any hardening (KASAN/slab poisoning) and, when the reclaimed `conn-\u003emtu` reads as 0, `count` becomes 0 so `len` never decreases \u2014 an infinite skb-allocation loop causing hang and memory exhaustion. Either outcome is a full denial of service."
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      "title": "Bluetooth: L2CAP: Fix potential user-after-free",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Clear Present bit before tearing down PASID entry\n\nThe Intel VT-d Scalable Mode PASID table entry consists of 512 bits (64\nbytes). When tearing down an entry, the current implementation zeros the\nentire 64-byte structure immediately using multiple 64-bit writes.\n\nSince the IOMMU hardware may fetch these 64 bytes using multiple\ninternal transactions (e.g., four 128-bit bursts), updating or zeroing\nthe entire entry while it is active (P=1) risks a \"torn\" read. If a\nhardware fetch occurs simultaneously with the CPU zeroing the entry, the\nhardware could observe an inconsistent state, leading to unpredictable\nbehavior or spurious faults.\n\nFollow 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 PASID entry.\n2. Use a dma_wmb() to ensure the cleared bit is visible to hardware\n   before proceeding.\n3. Execute the required invalidation sequence (PASID cache, IOTLB, and\n   Device-TLB flush) to ensure the hardware has released all cached\n   references.\n4. Only after the flushes are complete, zero out the remaining fields\n   of the PASID entry.\n\nAlso, add a dma_wmb() in pasid_set_present() to ensure that all other\nfields of the PASID entry are visible to the hardware before the Present\nbit is set."
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              "value": "AV:L - The teardown path is reached only through local interfaces \u2014 IOMMU domain attach/detach, SVA bind/unbind via accelerator char devices, and VFIO/iommufd ioctls \u2014 plus a locally-controlled device\u0027s DMA; there is no remote/network path to this code.\nAC:H - Triggering the torn read requires the IOMMU\u0027s internal multi-burst fetch of the 64-byte entry to interleave with the CPU\u0027s eight 64-bit zeroing writes during the narrow teardown window; this sub-microsecond hardware-internal timing is beyond the attacker\u0027s control and cannot be reliably reproduced.\nPR:L - Reaching the teardown requires local access to manage an IOMMU domain or to bind/unbind a PASID on an SVA-capable accelerator (reachable by an unprivileged user granted device access), not a pre-auth or fully unauthenticated path.\nUI:N - No victim interaction is needed; the attacker drives both the device DMA and the PASID-entry teardown.\nS:C - The IOMMU enforces the DMA isolation boundary; a torn/inconsistent PASID-entry read can cause the IOMMU to mistranslate a device\u0027s DMA, allowing access outside the device\u0027s authorized memory scope \u2014 an IOMMU/DMA boundary crossing.\nC:H - Mistranslation from an inconsistent entry read could let a device (e.g., guest-assigned or SVA-bound) read host physical memory outside its domain, yielding disclosure of memory beyond its authorized scope.\nI:H - The same mistranslation could let a device perform DMA writes to host physical memory outside its assigned domain, corrupting memory across the isolation boundary.\nA:H - The torn read causes \"spurious faults\" and \"unpredictable\" IOMMU behavior, which can produce DMA fault storms or device/translation failures impacting availability."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Reject unknown opcodes before ICRC processing\n\nEven after applying commit 7244491dab34 (\"RDMA/rxe: Validate pad and ICRC\nbefore payload_size() in rxe_rcv\"), a single unauthenticated UDP packet\ncan still trigger panic.  That patch handled payload_size() underflow only\nfor valid opcodes with short packets, not for packets carrying an unknown\nopcode.  The unknown-opcode OOB read described below predates that commit\nand reaches back to the initial Soft RoCE driver.\n\nThe check added there reads\n\n    pkt-\u003epaylen \u003c header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE\n\nwhere header_size(pkt) expands to rxe_opcode[pkt-\u003eopcode].length.  The\nrxe_opcode[] array has 256 entries but is only populated for defined IB\nopcodes; any other entry (for example opcode 0xff) is zero-initialized, so\nlength == 0 and the check degenerates to\n\n    pkt-\u003epaylen \u003c 0 + bth_pad(pkt) + RXE_ICRC_SIZE\n\nwhich does not constrain pkt-\u003epaylen enough.  rxe_icrc_hdr() then computes\n\n    rxe_opcode[pkt-\u003eopcode].length - RXE_BTH_BYTES\n\nwhich underflows when length == 0 and passes a huge value to rxe_crc32(),\ncausing an out-of-bounds read of the skb payload.\n\nReproduced on v7.0-rc7 with that fix applied, QEMU/KVM with\nCONFIG_RDMA_RXE=y and CONFIG_KASAN=y, after\n\n    rdma link add rxe0 type rxe netdev eth0\n\nA single 48-byte UDP packet to port 4791 with BTH opcode=0xff and\nQPN=IB_MULTICAST_QPN triggers:\n\n    BUG: KASAN: slab-out-of-bounds in crc32_le+0x115/0x170\n    Read of size 1 at addr ...\n    The buggy address is located 0 bytes to the right of\n     allocated 704-byte region\n    Call Trace:\n     crc32_le+0x115/0x170\n     rxe_icrc_hdr.isra.0+0x226/0x300\n     rxe_icrc_check+0x13f/0x3a0\n     rxe_rcv+0x6e1/0x16e0\n     rxe_udp_encap_recv+0x20a/0x320\n     udp_queue_rcv_one_skb+0x7ed/0x12c0\n\nSubsequent packets with the same shape fault on unmapped memory and panic\nthe kernel.  The trigger requires only module load and \"rdma link add\"; no\nQP, no connection, and no authentication.\n\nFix this by rejecting packets whose opcode has no rxe_opcode[] entry,\ndetected via the zero mask or zero length, before any length arithmetic\nruns."
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