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vuln-cve/data/2024/40xxx/CVE-2024-40901.json
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{
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"cveId": "CVE-2024-40901",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory\n\nThere is a potential out-of-bounds access when using test_bit() on a single\nword. The test_bit() and set_bit() functions operate on long values, and\nwhen testing or setting a single word, they can exceed the word\nboundary. KASAN detects this issue and produces a dump:\n\n\t BUG: KASAN: slab-out-of-bounds in _scsih_add_device.constprop.0 (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 drivers/scsi/mpt3sas/mpt3sas_scsih.c:7331) mpt3sas\n\n\t Write of size 8 at addr ffff8881d26e3c60 by task kworker/u1536:2/2965\n\nFor full log, please look at [1].\n\nMake the allocation at least the size of sizeof(unsigned long) so that\nset_bit() and test_bit() have sufficient room for read/write operations\nwithout overwriting unallocated memory.\n\n[1] Link: https://lore.kernel.org/all/ZkNcALr3W3KGYYJG@gmail.com/"
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"value": "AV:L - The undersized bitmaps are per-HBA kernel objects touched by local device-discovery/reset work and by the `MPT3COMMAND` ioctl on `/dev/mpt3ctl`, which passes a user-supplied `device_handle` to `test_bit()`. Nothing here processes remote network data, so local access is required.\nAC:L - On any controller whose firmware reports a `MaxDevHandle` that is not a multiple of 64, the allocation is deterministically short and every device add/remove or handle-referencing ioctl performs the 8-byte read-modify-write past the requested allocation. No race, no memory-layout grooming, and no unpredictable system state is involved.\nPR:L - The driver performs no `capable()`/`CAP_SYS_RAWIO` check on any of these paths — reachability is governed solely by device-node policy, and appliance, storage-management and container deployments routinely hand `/dev/mpt3ctl` or HBA-attached block devices to a non-root storage group. The OOB write side itself occurs in automatic discovery work that needs no privilege at all, so low privileges are the ceiling of what an attacker needs.\nUI:N - Device discovery, hotplug handling and controller reset run autonomously in the driver's firmware-event workqueue, and the ioctl path is a plain syscall. No victim action of any kind is required.\nS:U - The out-of-bounds access corrupts kernel slab memory from within kernel context; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:L - `test_bit()` reads an 8-byte word that extends past the allocation, but the overread is strictly bounded to at most 7 adjacent bytes and only the in-bounds bit is consumed, so no meaningful memory contents are returned to the attacker.\nI:H - This is an out-of-bounds write — KASAN reports `Write of size 8` past the slab allocation from `_scsih_add_device` — and the atomic RMW spans neighbouring heap bytes, which can clobber a concurrent non-atomic update to adjacent slab memory. Per the out-of-bounds-write classification this is scored High.\nA:H - The trailing word access crosses the object boundary, which faults into the guard page under KFENCE (enabled by default in mainstream distro and Android kernels) and raises a slab-out-of-bounds BUG under KASAN or SLUB redzoning, producing an oops or, with `panic_on_warn`, a full kernel panic."
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