367 lines
17 KiB
JSON
367 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-2021-47185",
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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": "2024-03-25T09:12:14.113Z",
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"datePublished": "2024-04-10T18:56:25.671Z",
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"dateUpdated": "2026-05-11T13:49:37.452Z"
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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": "2026-05-11T13:49:37.452Z"
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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\ntty: tty_buffer: Fix the softlockup issue in flush_to_ldisc\n\nWhen running ltp testcase(ltp/testcases/kernel/pty/pty04.c) with arm64, there is a soft lockup,\nwhich look like this one:\n\n Workqueue: events_unbound flush_to_ldisc\n Call trace:\n dump_backtrace+0x0/0x1ec\n show_stack+0x24/0x30\n dump_stack+0xd0/0x128\n panic+0x15c/0x374\n watchdog_timer_fn+0x2b8/0x304\n __run_hrtimer+0x88/0x2c0\n __hrtimer_run_queues+0xa4/0x120\n hrtimer_interrupt+0xfc/0x270\n arch_timer_handler_phys+0x40/0x50\n handle_percpu_devid_irq+0x94/0x220\n __handle_domain_irq+0x88/0xf0\n gic_handle_irq+0x84/0xfc\n el1_irq+0xc8/0x180\n slip_unesc+0x80/0x214 [slip]\n tty_ldisc_receive_buf+0x64/0x80\n tty_port_default_receive_buf+0x50/0x90\n flush_to_ldisc+0xbc/0x110\n process_one_work+0x1d4/0x4b0\n worker_thread+0x180/0x430\n kthread+0x11c/0x120\n\nIn the testcase pty04, The first process call the write syscall to send\ndata to the pty master. At the same time, the workqueue will do the\nflush_to_ldisc to pop data in a loop until there is no more data left.\nWhen the sender and workqueue running in different core, the sender sends\ndata fastly in full time which will result in workqueue doing work in loop\nfor a long time and occuring softlockup in flush_to_ldisc with kernel\nconfigured without preempt. So I add need_resched check and cond_resched\nin the flush_to_ldisc loop to avoid it."
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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/tty/tty_buffer.c"
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],
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"versions": [
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{
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"lessThan": "0380f643f3a7a61b0845cdc738959c2ad5735d61",
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"status": "affected",
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"lessThan": "b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc",
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"status": "affected",
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},
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{
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"version": "81de916f19cf5f1437c0b9ed817364f0f7c81961",
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"lessThan": "4c1623651a0936ee197859824cdae6ebbd04d3ed",
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"status": "affected",
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"lessThan": "d491c84df5c469dd9621863b6a770b3428137063",
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"status": "affected",
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{
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}
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},
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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/tty/tty_buffer.c"
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],
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"versions": [
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{
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"version": "3.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.0",
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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": "4.4.293",
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"lessThanOrEqual": "4.4.*",
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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": "4.9.291",
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"lessThanOrEqual": "4.9.*",
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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": "4.14.256",
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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": "4.19.218",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.162",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.82",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.5",
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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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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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},
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{
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"url": "https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725"
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},
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{
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"url": "https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063"
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},
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{
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"url": "https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41"
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{
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{
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"url": "https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1"
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}
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],
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"title": "tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"lang": "en",
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"description": "CWE-noinfo Not enough information"
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}
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]
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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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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 4.4,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "HIGH",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2024-04-15T14:53:32.237242Z",
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"id": "CVE-2021-47185",
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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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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-11-01T14:14:51.983Z"
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{
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"dateUpdated": "2024-08-04T05:32:07.394Z"
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},
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61",
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