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              "value": "AV:L - Exploitation requires a local account to open a PF_CAN/CAN_BCM socket, issue RX_SETUP/RX_DELETE via sendmsg(), and read /proc/net/can-bcm/\u003cinode\u003e. No remote or adjacent network path reaches the racing procfs reader.\nAC:L - The attacker controls both sides of the race entirely \u2014 one thread loops reading the procfs entry while another loops RX_SETUP/RX_DELETE \u2014 and bcm_proc_show() held no lock whatsoever against the deleter, so the window is hit reliably by simple repetition; a working PoC was produced by the reporter for this bcm series.\nPR:L - can_create() performs no capability check, connect() with ifindex 0 needs no CAN device, and the created proc entry is mode 0644, so any unprivileged local user can drive the whole sequence in its own process (module autoload of can/can-bcm is also unprivileged).\nUI:N - The attacker performs every step itself \u2014 socket setup, op deletion, and reading its own procfs file \u2014 with no action by any other user.\nS:U - The freed object, the disclosure, and the crash are all within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Fields are read from a freed bcm_op and formatted directly into world-readable procfs output; since bcm_op lands in the sprayable kmalloc-512 cache, an attacker reclaiming it controls the list cursor and can steer the walk to arbitrary kernel addresses, leaking their contents to userspace.\nI:H - This is a use-after-free on an attacker-reclaimable slab object whose linkage pointers are dereferenced after free, a primitive that combined with heap grooming is leveraged for kernel state corruption and control-flow influence.\nA:H - A concurrent plain list_del() leaves LIST_POISON1 in the cursor, so the unprotected walker dereferences a non-canonical/freed pointer and oopses; the walk can also spin over reclaimed memory or hit a divide-by-zero on a re-read frames_abs, crashing or hanging the kernel."
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    "datePublished": "2025-06-08T10:34:55.808Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2026-08-05T11:58:54.550Z",
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              "value": "AV:L - Exploitation requires a local `socket(PF_CAN, SOCK_DGRAM, CAN_BCM)` and concurrent `sendmsg()` calls; the race is between the local socket\u0027s user context and the local hrtimer softirq, with no remote input involved.\nAC:L - The attacker controls both sides of the race \u2014 arming the hrtimer with a 1 \u00b5s `ival` (allowed by `bcm_is_invalid_tv()`) to spin `bcm_can_tx()` in softirq while looping `TX_SETUP|TX_ANNOUNCE` sendmsg on another CPU; a working PoC was written and tested by the reporter.\nPR:L - `can_create()` performs no capability check and `can-bcm` is module-autoloaded on socket creation, so any unprivileged local user can reach `bcm_tx_setup()`; the required CAN netdev exists by default on automotive/industrial targets and is otherwise creatable via `unshare -Urn` plus vcan.\nUI:N - The attacker triggers the entire sequence from its own process \u2014 socket creation, timer arming, and the concurrent TX_SETUP updates \u2014 with no victim action required.\nS:U - The out-of-bounds read, the leaked pointers, and the counter underflow are all confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The OOB read is not merely detected by KASAN \u2014 the stale-heap bytes are copied into an skb and looped back by `can_send(skb, 1)`, so up to 72 bytes of adjacent slab memory per iteration, including the `op-\u003esk` and `op-\u003erx_reg_dev` kernel pointers, are delivered to a userspace `CAN_RAW` socket, giving a repeatable heap/KASLR disclosure primitive.\nI:L - No out-of-bounds write primitive exists (`currframe` is only a read index), but the unsynchronized `op-\u003ecount--` from both contexts corrupts kernel state by underflowing the u32 counter, and `op-\u003ecurrframe` itself is left in an invalid out-of-range state, causing the kernel to emit frames it was never instructed to send.\nA:H - The `op-\u003ecount` underflow to 0xFFFFFFFF makes `bcm_tx_set_expiry()` re-arm indefinitely at a 1 \u00b5s interval, producing a persistent softirq/TX flood that starves the CPU, and the slab-out-of-bounds access panics KASAN/hardened kernels outright."
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