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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix mm lifecycle in open-coded task_vma iterator\n\nThe open-coded task_vma iterator reads task-\u003emm locklessly and acquires\nmmap_read_trylock() but never calls mmget(). If the task exits\nconcurrently, the mm_struct can be freed as it is not\nSLAB_TYPESAFE_BY_RCU, resulting in a use-after-free.\n\nSafely read task-\u003emm with a trylock on alloc_lock and acquire an mm\nreference. Drop the reference via bpf_iter_mmput_async() in _destroy()\nand error paths. bpf_iter_mmput_async() is a local wrapper around\nmmput_async() with a fallback to mmput() on !CONFIG_MMU.\n\nReject irqs-disabled contexts (including NMI) up front. Operations used\nby _next() and _destroy() (mmap_read_unlock, bpf_iter_mmput_async)\ntake spinlocks with IRQs disabled (pool-\u003elock, pi_lock). Running from\nNMI or from a tracepoint that fires with those locks held could\ndeadlock.\n\nA trylock on alloc_lock is used instead of the blocking task_lock()\n(get_task_mm) to avoid a deadlock when a softirq BPF program iterates\na task that already holds its alloc_lock on the same CPU."
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              "value": "AV:L - The vulnerable code is reached by a local attacker loading and running a BPF program through the bpf() syscall that invokes the open-coded task_vma iterator kfuncs. It is not reachable directly from remote network input.\nAC:L - The triggering race is attacker-controllable by selecting or creating a target task and racing its exit while repeatedly invoking bpf_iter_task_vma_new/next/destroy. No rare external condition is required beyond normal BPF availability.\nPR:L - kfunc calls require BPF privilege, but BPF tokens allow CAP_BPF/CAP_PERFMON-style checks in a delegated user namespace, making this reachable by a low-privileged local user in a reasonable user-namespace deployment. Without such delegation it would require init-namespace BPF privileges, but uncertainty is resolved toward the higher-severity PR:L.\nUI:N - Exploitation does not require a victim user action after the attacker has local execution. The attacker can load the BPF program and control the racing task lifecycle themselves.\nS:U - The vulnerability is in the kernel and impacts kernel-controlled memory and execution within the same security authority. This is a standard local kernel compromise path rather than a cross-scope VM or hardware boundary escape.\nC:H - The bug is a use-after-free of mm_struct, which can allow freed kernel memory to be read or interpreted after reallocation while walking VMA state. Under the required conservative scoring rule, kernel UAF memory corruption supports high confidentiality impact.\nI:H - The stale mm_struct is used in locking and VMA iteration paths, causing writes to and operations on freed or reallocated kernel memory. This UAF is plausibly exploitable for arbitrary kernel memory corruption or code execution, so integrity impact is high.\nA:H - Even without full exploitation, dereferencing and locking a freed mm_struct can readily crash or hang the kernel. A local attacker can repeat the trigger, so availability impact is high."
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