235 lines
12 KiB
JSON
235 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2023-53111",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-05-02T15:51:43.554Z",
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"datePublished": "2025-05-02T15:55:51.029Z",
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"dateUpdated": "2026-10-30T12:17:26.200Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:17:26.200Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Fix use-after-free issues\n\ndo_req_filebacked() calls blk_mq_complete_request() synchronously or\nasynchronously when using asynchronous I/O unless memory allocation fails.\nHence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor\n'rq' after do_req_filebacked() finished unless we are sure that the request\nhas not yet been completed. This patch fixes the following kernel crash:\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000054\nCall trace:\n css_put.42938+0x1c/0x1ac\n loop_process_work+0xc8c/0xfd4\n loop_rootcg_workfn+0x24/0x34\n process_one_work+0x244/0x558\n worker_thread+0x400/0x8fc\n kthread+0x16c/0x1e0\n ret_from_fork+0x10/0x20"
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The bug is in the loop block driver’s I/O completion path (loop_handle_cmd), reached via local block I/O or loop ioctls on /dev/loop*, not by parsing remote network packets.\nAC:L - With LO_FLAGS_DIRECT_IO/AIO, lo_rw_aio can complete and free the request synchronously before do_req_filebacked() returns, so the subsequent cmd dereferences are a reliable UAF the attacker triggers by submitting I/O—no conditions outside attacker control.\nPR:L - LOOP_SET_FD/LOOP_CONFIGURE require no CAP_SYS_ADMIN—only open access to the loop device node—and LO_FLAGS_DIRECT_IO is a LOOP_CONFIGURE_SETTABLE_FLAGS bit; unprivileged users with device access (disk group, containers) or who can perform I/O on an already DIO-backed loop mount can reach the path.\nUI:N - The attacker configures the loop device (or uses an accessible one) and submits reads/writes themselves; no separate victim action is required.\nS:U - Impact is confined to the local kernel’s authority (crash or privilege escalation within the host); it does not cross a VM/IOMMU/sandbox boundary.\nC:H - Use-after-free of the blk-mq request PDU (loop_cmd) lets an attacker reclaim and control freed object contents, enabling information disclosure primitives from the corrupted state.\nI:H - The same UAF can be turned into strong integrity primitives (e.g., css_put on a reclaimed pointer, double completion via corrupted use_aio), supporting arbitrary write / control-flow hijack.\nA:H - The report’s crash (NULL deref in css_put from loop_process_work) shows a kernel oops/panic is readily achievable whenever the freed cmd is accessed."
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}
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]
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}
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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},
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"version": "6.2.8",
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"lessThanOrEqual": "6.2.*",
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"role": "CISA Coordinator",
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"options": [
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{
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:33:59.619907Z"
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} |