329 lines
17 KiB
JSON
329 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47576",
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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": "2024-05-24T15:11:00.730Z",
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"datePublished": "2024-06-19T14:53:44.725Z",
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"dateUpdated": "2026-08-05T08:48:26.375Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:26.375Z"
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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\nscsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()\n\nIn resp_mode_select() sanity check the block descriptor len to avoid UAF.\n\nBUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509\nRead of size 1 at addr ffff888026670f50 by task scsicmd/15032\n\nCPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0-01d0625 #15\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nCall Trace:\n <TASK>\n dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107\n print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:257\n kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443\n __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306\n resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509\n schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483\n scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537\n scsi_queue_rq+0x16b4/0x2d10 drivers/scsi/scsi_lib.c:1521\n blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640\n __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325\n blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358\n __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1762\n __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839\n blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891\n blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474\n blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63\n sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:837\n sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775\n sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:941\n sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166\n __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52\n do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50\n entry_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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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:H/A:H",
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"baseScore": 7.8,
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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 vulnerability is triggered via SG_IO ioctl on a local /dev/sg device node for a scsi_debug virtual LUN, as shown in the syzkaller call trace; scsi_debug is a host-side simulator and is not reachable over the network.\nAC:L - An attacker who can open the scsi_debug sg device can reliably trigger the bug by sending a crafted MODE SELECT(10) command with an oversized block descriptor length; no race or unpredictable conditions are required.\nPR:L - MODE_SELECT is permitted to any process that can open /dev/sg for write without CAP_SYS_RAWIO; this is achievable by an unprivileged local user with access to the device (e.g., disk-group membership), not requiring full root.\nUI:N - Exploitation is performed solely by the attacker issuing ioctl/SG_IO with a malicious CDB and parameter list; no separate user action is required.\nS:U - The memory corruption occurs in the kernel's scsi_debug handler and can escalate privileges within the same OS security authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - The unchecked bd_len produces an out-of-bounds read past the stack buffer into adjacent kernel memory (KASAN-reported UAF read), enabling arbitrary kernel memory disclosure.\nI:H - KASAN classifies this as a use-after-free memory corruption, which per scoring guidance yields a high integrity impact through potential control of freed object contents and subsequent write primitives.\nA:H - The out-of-bounds/UAF access can cause a kernel oops, KASAN fault, or panic when invalid or unmapped memory is touched, fully disrupting system availability."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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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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"programFiles": [
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"drivers/scsi/scsi_debug.c"
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],
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"versions": [
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{
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"version": "231839102b54512ced7d3ee7fc9b8bcf5e3b583b",
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"lessThan": "adcecd50da6cab7b4957cba0606771dcc846c5a9",
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"status": "affected",
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"version": "231839102b54512ced7d3ee7fc9b8bcf5e3b583b",
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"lessThan": "90491283b4064220682e4b0687d07b05df01e3bf",
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"status": "affected",
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"lessThan": "04181973c38f3d6a353f9246dcf7fee08024fd9e",
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"status": "affected",
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"lessThan": "b847ecff850719c46c95acd25a0d555dfd16e10d",
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"version": "231839102b54512ced7d3ee7fc9b8bcf5e3b583b",
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"lessThan": "a9078e791426c2cbbdf28a320c3670f6e0a611e6",
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"status": "affected",
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"version": "231839102b54512ced7d3ee7fc9b8bcf5e3b583b",
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/scsi/scsi_debug.c"
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],
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"versions": [
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{
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"version": "2.6.19",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "2.6.19",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "4.9.294",
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"lessThanOrEqual": "4.9.*",
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"status": "unaffected",
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},
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{
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"version": "4.14.259",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.222",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.168",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.88",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.11",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"cpeApplicability": [
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}
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],
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"title": "scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()",
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"x_generator": {
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47576",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Technical Impact": "partial"
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}
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"version": "2.0.3",
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"timestamp": "2024-09-10T17:12:55.832156Z"
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} |