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              "value": "AV:L - The documented trigger is a local userspace operation \u2014 `ffs_epfile_release()` on a FunctionFS endpoint file racing an in-flight IN request \u2014 which reaches `dwc3_gadget_soft_disconnect()` \u2192 `dwc3_stop_active_transfers()` without any physical access to the device. A local process holding the FFS endpoint fds (or any process able to cause the FFS daemon\u0027s fds to close) drives the whole sequence via ordinary write/close syscalls.\nAC:L - The attacker controls both sides of the race: it queues the transfer (write to the ep file) and triggers the teardown (close of the ep file), and the pre-fix code performs zero wait after ENDXFER, so the window is essentially always open rather than a narrow timing fluke. The attempt is freely repeatable and the affected DWC_usb3 \u2265 3.10a IP is a common mainstream configuration.\nPR:L - Only an unprivileged local process with access to the FunctionFS endpoint files (whose ownership is set by the mount\u0027s uid=/gid= options, e.g. the adb/MTP user on Android) is needed; no root or CAP_SYS_ADMIN is required. Queuing a transfer and closing the descriptor are ordinary file operations.\nUI:N - The attacking process performs the queue and the release itself; no victim action is required. The USB cable being attached is an ambient condition of the target device (phone on a charger/PC, kiosk, embedded controller), not an interaction the attacker must induce.\nS:U - The stale DMA writes into kernel memory the controller was already granted access to, and both the vulnerable component and the impacted component are the kernel itself. No VM, IOMMU, or sandbox security boundary is crossed.\nC:H - For IN endpoints the controller keeps reading the buffer after `usb_gadget_unmap_request_by_dev()` and `kfree()`, so contents of reallocated kernel heap memory are streamed out over USB to the attached host \u2014 an arbitrary-content kernel memory disclosure. This is a use-after-free read with attacker-observable output.\nI:H - For OUT endpoints the controller continues writing host-supplied data into memory that has been DMA-unmapped and freed, giving a use-after-free write with attacker-controlled contents into reallocated kernel objects. That is a heap-spray-friendly write primitive suitable for control-flow hijacking.\nA:H - The commit reports SMMU faults from the controller accessing already-unmapped requests, which on typical SoC IOMMU configurations abort the transaction and panic or wedge the USB controller. Absent an IOMMU, the resulting freed-memory corruption reliably produces oopses and kernel panics."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: xmit: make sure we have at least eth header len bytes\n\nsyzbot triggered an uninit value[1] error in bridge device\u0027s xmit path\nby sending a short (less than ETH_HLEN bytes) skb. To fix it check if\nwe can actually pull that amount instead of assuming.\n\nTested with dropwatch:\n drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\n origin: software\n timestamp: Mon May 13 11:31:53 2024 778214037 nsec\n protocol: 0x88a8\n length: 2\n original length: 2\n drop reason: PKT_TOO_SMALL\n\n[1]\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n xmit_one net/core/dev.c:3531 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n __bpf_tx_skb net/core/filter.c:2136 [inline]\n __bpf_redirect_common net/core/filter.c:2180 [inline]\n __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\n ____bpf_clone_redirect net/core/filter.c:2460 [inline]\n bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\n ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\n bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\n __bpf_prog_run include/linux/filter.h:657 [inline]\n bpf_prog_run include/linux/filter.h:664 [inline]\n bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\n bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\n bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\n __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\n __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\n x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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              "lang": "en",
              "value": "AV:L - `br_dev_xmit()` is the bridge device\u0027s locally-originated transmit path \u2014 remotely received frames go through `br_handle_frame`/`br_forward` and always carry a full Ethernet header, and IP routing toward a bridge always builds one via `dev_hard_header()`. Triggering it requires local injection of a sub-14-byte skb (tun write or AF_PACKET on a `hard_header_len == 0` device, plus a tc `mirred` redirect).\nAC:L - The attacker fully and deterministically controls the skb length; there is no race, no timing window, and no dependence on memory layout or victim state. Every attempt reaches the uninitialized read and the subsequent `skb_push()` leak.\nPR:L - The setup needs CAP_NET_ADMIN/CAP_NET_RAW only within a network namespace, which any unprivileged user obtains via `unshare -Urn` (create the bridge, create the tun/tunnel device, attach the tc mirred redirect, and capture leaked frames from a veth peer). No real root in the initial namespace is required.\nUI:N - The attacker performs every step \u2014 creating the devices, writing the short frame, and reading the leaked frames back \u2014 with no action by any other user or administrator.\nS:U - The uninitialized read, the malformed skb, and the resulting disclosure all stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 14 bytes of uninitialized kernel heap (skb headroom and the region past `skb-\u003etail`, which routinely holds freed packet data and kernel values) are read and then, via the unconditional `skb_push(skb, ETH_HLEN)` in `br_dev_queue_push_xmit()`, transmitted verbatim out every bridge port where the attacker captures them. The leak is repeatable at packet rate, yielding an effectively unbounded kernel memory disclosure rather than a bounded few-byte read.\nI:L - There is no out-of-bounds write primitive, but the kernel emits malformed frames whose source/destination MAC addresses are uninitialized memory, and forwarding decisions (broadcast/multicast/unicast, FDB lookup) are made on that garbage \u2014 corrupting local and peer bridge/switch forwarding state in a limited, attacker-influenced way.\nA:H - When the short skb has less than ETH_HLEN of headroom (as in the syzbot BPF-redirect reproducer), `skb_push(skb, ETH_HLEN)` in `br_dev_queue_push_xmit()` drives `skb-\u003edata` below `skb-\u003ehead` and hits `skb_under_panic()` \u2192 `BUG()`, a hard kernel panic. Additionally the resulting skb has `mac_header`/`network_header` desynchronized from `skb-\u003edata`, propagating a malformed skb into the generic xmit path (e.g. the `WARN_ONCE` in `skb_checksum_help()`, fatal under `panic_on_warn`), and the trigger can be repeated indefinitely."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/cma: Fix kmemleak in rdma_core observed during blktests nvme/rdma use siw\n\nWhen running blktests nvme/rdma, the following kmemleak issue will appear.\n\nkmemleak: Kernel memory leak detector initialized (mempool available:36041)\nkmemleak: Automatic memory scanning thread started\nkmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nkmemleak: 8 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nkmemleak: 17 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nkmemleak: 4 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n\nunreferenced object 0xffff88855da53400 (size 192):\n  comm \"rdma\", pid 10630, jiffies 4296575922\n  hex dump (first 32 bytes):\n    37 00 00 00 00 00 00 00 c0 ff ff ff 1f 00 00 00  7...............\n    10 34 a5 5d 85 88 ff ff 10 34 a5 5d 85 88 ff ff  .4.].....4.]....\n  backtrace (crc 47f66721):\n    [\u003cffffffff911251bd\u003e] kmalloc_trace+0x30d/0x3b0\n    [\u003cffffffffc2640ff7\u003e] alloc_gid_entry+0x47/0x380 [ib_core]\n    [\u003cffffffffc2642206\u003e] add_modify_gid+0x166/0x930 [ib_core]\n    [\u003cffffffffc2643468\u003e] ib_cache_update.part.0+0x6d8/0x910 [ib_core]\n    [\u003cffffffffc2644e1a\u003e] ib_cache_setup_one+0x24a/0x350 [ib_core]\n    [\u003cffffffffc263949e\u003e] ib_register_device+0x9e/0x3a0 [ib_core]\n    [\u003cffffffffc2a3d389\u003e] 0xffffffffc2a3d389\n    [\u003cffffffffc2688cd8\u003e] nldev_newlink+0x2b8/0x520 [ib_core]\n    [\u003cffffffffc2645fe3\u003e] rdma_nl_rcv_msg+0x2c3/0x520 [ib_core]\n    [\u003cffffffffc264648c\u003e]\nrdma_nl_rcv_skb.constprop.0.isra.0+0x23c/0x3a0 [ib_core]\n    [\u003cffffffff9270e7b5\u003e] netlink_unicast+0x445/0x710\n    [\u003cffffffff9270f1f1\u003e] netlink_sendmsg+0x761/0xc40\n    [\u003cffffffff9249db29\u003e] __sys_sendto+0x3a9/0x420\n    [\u003cffffffff9249dc8c\u003e] __x64_sys_sendto+0xdc/0x1b0\n    [\u003cffffffff92db0ad3\u003e] do_syscall_64+0x93/0x180\n    [\u003cffffffff92e00126\u003e] entry_SYSCALL_64_after_hwframe+0x71/0x79\n\nThe root cause: rdma_put_gid_attr is not called when sgid_attr is set\nto ERR_PTR(-ENODEV)."
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