302 lines
16 KiB
JSON
302 lines
16 KiB
JSON
{
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"cveId": "CVE-2021-47346",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T14:28:16.980Z",
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"datePublished": "2024-05-21T14:35:52.284Z",
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"dateUpdated": "2026-08-05T08:47:21.617Z"
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:21.617Z"
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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\ncoresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()\n\ncommit 6f755e85c332 (\"coresight: Add helper for inserting synchronization\npackets\") removed trailing '\\0' from barrier_pkt array and updated the\ncall sites like etb_update_buffer() to have proper checks for barrier_pkt\nsize before read but missed updating tmc_update_etf_buffer() which still\nreads barrier_pkt past the array size resulting in KASAN out-of-bounds\nbug. Fix this by adding a check for barrier_pkt size before accessing\nlike it is done in etb_update_buffer().\n\n BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698\n Read of size 4 at addr ffffffd05b7d1030 by task perf/2629\n\n Call trace:\n dump_backtrace+0x0/0x27c\n show_stack+0x20/0x2c\n dump_stack+0x11c/0x188\n print_address_description+0x3c/0x4a4\n __kasan_report+0x140/0x164\n kasan_report+0x10/0x18\n __asan_report_load4_noabort+0x1c/0x24\n tmc_update_etf_buffer+0x4b8/0x698\n etm_event_stop+0x248/0x2d8\n etm_event_del+0x20/0x2c\n event_sched_out+0x214/0x6f0\n group_sched_out+0xd0/0x270\n ctx_sched_out+0x2ec/0x518\n __perf_event_task_sched_out+0x4fc/0xe6c\n __schedule+0x1094/0x16a0\n preempt_schedule_irq+0x88/0x170\n arm64_preempt_schedule_irq+0xf0/0x18c\n el1_irq+0xe8/0x180\n perf_event_exec+0x4d8/0x56c\n setup_new_exec+0x204/0x400\n load_elf_binary+0x72c/0x18c0\n search_binary_handler+0x13c/0x420\n load_script+0x500/0x6c4\n search_binary_handler+0x13c/0x420\n exec_binprm+0x118/0x654\n __do_execve_file+0x77c/0xba4\n __arm64_compat_sys_execve+0x98/0xac\n el0_svc_common+0x1f8/0x5e0\n el0_svc_compat_handler+0x84/0xb0\n el0_svc_compat+0x10/0x50\n\n The buggy address belongs to the variable:\n barrier_pkt+0x10/0x40\n\n Memory state around the buggy address:\n ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00\n ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ffffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03\n ^\n ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa\n ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa\n =================================================================="
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only through the CoreSight ETM perf PMU path (perf_event_open → etm_event_stop → tmc_update_etf_buffer), which requires local syscall access on a system with CoreSight ETF hardware.\nAC:L - An attacker who can open a cs_etm session can reliably force lost=true by using a small AUX buffer so to_read exceeds handle->size, which engages the broken barrier_pkt walk without depending on races or uncontrolled state.\nPR:L - Under the default perf_event_paranoid=2, an unprivileged user can open a per-task cs_etm event with exclude_kernel set; etm_event_init imposes no CAP_PERFMON/CAP_SYS_ADMIN check, so real root is not required.\nUI:N - The attacker configures and drives the perf session themselves; no separate victim action is required to reach tmc_update_etf_buffer.\nS:U - Impact stays within the host kernel authority (kernel memory disclosure / potential oops); there is no VM, IOMMU, or sandbox boundary crossing.\nC:H - When lost is set, the vulnerable loop keeps reading past coresight_barrier_pkt and writes those OOB kernel words into the attacker-readable perf AUX buffer, yielding an unbounded-until-zero out-of-bounds kernel read to userspace.\nI:N - The only stores are into the attacker’s own AUX data_pages; there is no out-of-bounds or attacker-controlled write to other kernel memory or integrity-sensitive state.\nA:H - The global out-of-bounds read is a memory-safety violation that can fault if the walk proceeds into unmapped memory, and per scoring policy the higher availability impact is selected when a crash cannot be ruled out."
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