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              "value": "AV:L - The vulnerability is reached through the setxattr(2)/lsetxattr/fsetxattr syscall on a file residing on an already-mounted JFFS2 volume, requiring local access to the system. There is no network-facing consumer of this path in a realistic JFFS2 (embedded flash) deployment.\nAC:L - A single setxattr call with a value larger than the eraseblock deterministically triggers the over-allocation and the overflowing write \u2014 no race, no memory-layout dependency, and the attacker chooses the value size. The only precondition is an eraseblock of 64K or less, which is the standard geometry for the NOR flash JFFS2 targets (the public reproducer used a 4K eraseblock).\nPR:L - The user.* xattr handler is registered unconditionally with CONFIG_JFFS2_FS_XATTR and the VFS only requires write permission on the target inode, so any unprivileged local account with a writable file or directory on the JFFS2 mount can reach do_jffs2_setxattr. No capability check exists anywhere on the path.\nUI:N - On the affected class of systems the JFFS2 volume is the rootfs or data partition mounted automatically at boot, so the attacker acts alone with no victim action required. The vulnerable syscall path executes entirely in the attacker\u0027s own context.\nS:U - The corruption is confined to the kernel\u0027s own memory and the flash medium it manages, within a single security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The wrapped write offset indexes c-\u003eblocks far out of bounds, producing a KASAN-confirmed slab out-of-bounds read and subsequent wild-pointer dereferences of attacker-groomable heap data. The corrupted on-media node layout also causes later reads to parse data at wrong offsets, exposing neighbouring nodes belonging to other users\u0027 and root-owned files.\nI:H - The oversized node is written past the end of its eraseblock, overwriting nodes of unrelated files \u2014 on a JFFS2 rootfs that means arbitrary system data an unprivileged user cannot otherwise touch. The resulting free_size underflow drives jffs2_link_node_ref() to write through a jeb-\u003elast_node pointer read from out-of-bounds heap memory, a kernel-memory write primitive suitable for control-flow hijack.\nA:H - The path reaches wild-pointer dereferences and an explicit BUG() in jffs2_link_node_ref(), panicking the kernel. Worse, the damage is persistent: the commit log shows the volume subsequently fails eraseblock scanning at mount, permanently bricking an embedded device whose rootfs is JFFS2."
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              "value": "AV:N - The use-after-free dereference occurs in the TCP/MPTCP receive path (`mptcp_incoming_options()` \u2192 `mptcp_pm_del_add_timer()`), driven entirely by an `ADD_ADDR` echo option in a TCP segment sent by the remote MPTCP peer, executed in softirq context. Any internet-facing MPTCP-enabled endpoint (server or Android/mobile client with a `signal` endpoint configured) processes this attacker-supplied option, so the vulnerable code is reached over the network.\nAC:H - The remote peer can hammer the racing side without limit by repeatedly sending ADD_ADDR echoes, but the freeing side must be executed concurrently by the local path manager (netlink FLUSH_ADDRS/DEL_ADDR, e.g. mptcpd reacting to an interface change), which is timing the attacker cannot influence. Winning that window is a condition beyond the remote attacker\u0027s control.\nPR:N - The attacker-controlled side requires only being the peer of an established MPTCP connection to a listening service \u2014 no account, credentials, or privileges on the target are needed, and the ADD_ADDR echo is accepted as part of normal protocol processing once the connection is fully established.\nUI:N - No victim action is required; the ADD_ADDR announcement and the peer\u0027s echo are automatic protocol behaviour, and the concurrent endpoint flush is performed by a background path-manager daemon rather than an interactive user.\nS:U - The corruption is confined to kernel heap memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `mptcp_pm_add_entry` lives in a generic kmalloc cache and can be reclaimed with attacker-shaped data, and the subsequent `timer_delete_sync()`/`__sock_put()` on that stale object gives a foothold for arbitrary kernel memory disclosure, as is standard for slab use-after-free.\nI:H - `__timer_delete_sync()` on the reclaimed object acts on attacker-influenced `timer-\u003eflags` and can perform an hlist unlink write (`*pprev = next; next-\u003epprev = pprev`), and the spurious `__sock_put()` underflows the socket refcount \u2014 both yield write primitives leveragable for control-flow hijack. The same missing-lock defect also permits a double `kfree()` of the entry from two concurrent netlink removals.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free / kernel oops in softirq context (as reported by syzbot), and the resulting timer-base list corruption or socket refcount underflow causes a kernel panic."
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