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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there is a loop that\nhas 253 iterations. For each iteration, we may call verity_hash_for_block\nrecursively. There is a limit of 4 nested recursions - that means that\nthere may be at most 253^4 (4 billion) iterations. Red Hat QE team\nactually created an image that pushes dm-verity to this limit - and this\nimage just makes the udev-worker process get stuck in the \u0027D\u0027 state.\n\n2. It doesn\u0027t work. In fec_read_bufs we store data into the variable\n\"fio-\u003ebufs\", but fio bufs is shared between recursive invocations, if\n\"verity_hash_for_block\" invoked correction recursively, it would\noverwrite partially filled fio-\u003ebufs."
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              "value": "AV:N - In a reasonable cloud or network-boot deployment, dm-verity data, hash, and FEC devices can be NBD-backed, allowing attacker-controlled TCP replies to supply the crafted blocks directly to the verification path.\nAC:L - A static crafted image deterministically drives FEC scanning into as many as 253^4 recursive iterations, as demonstrated by Red Hat QE. No race or uncontrollable memory layout is required.\nPR:N - DM table creation requires CAP_SYS_ADMIN in the initial user namespace, but that is victim-side setup. A malicious configured network-block peer requires no account or privilege on the affected system to return crafted blocks.\nUI:N - Once the mapping is active, automatic udev probing, boot-time access, or ordinary filesystem I/O triggers FEC without requiring a user action.\nS:U - The vulnerable processing and resulting availability loss occur within the same kernel security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:N - Recursive calls only clobber bounded per-I/O Reed-Solomon working data, and corrected output is cryptographically revalidated before being copied to its destination. The flaw provides no disclosure or read primitive.\nI:N - Although nested decoding corrupts outer intermediate results, the wanted digest is checked before corrected data is used, so failure produces an I/O error rather than attacker-selected data. No arbitrary-write or control-flow primitive results from this flaw.\nA:H - The crafted blocks can force approximately 4.1 billion iterations and leave I/O submitters such as udev workers blocked in uninterruptible sleep. On a boot or operational image this can prevent startup or render the device and dependent services unavailable."
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    "dateReserved": "2026-01-13T15:30:19.665Z",
    "dateUpdated": "2026-09-08T08:44:03.288Z",
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