cve-2021-47375
Vulnerability from cvelistv5
Published
2024-05-21 15:03
Modified
2024-11-04 12:04
Severity ?
6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
blktrace: Fix uaf in blk_trace access after removing by sysfs
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3815fe7371d2411ce164281cef40d9fc7b323dee
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/488da313edf3abea7f7733efe011c96b23740ab5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5afedf670caf30a2b5a52da96eb7eac7dee6a9c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/677e362ba807f3aafe6f405c07e0b37244da5222
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5f8e86192612d0183047448d8bbe7918b3f1a26
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d56171d9360c0170c5c5f8f7e2362a2e999eca40
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dacfd5e4d1142bfb3809aab3634a375f6f373269
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ebb8d26d93c3ec3c7576c52a8373a2309423c069
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblktrace: Fix uaf in blk_trace access after removing by sysfs\n\nThere is an use-after-free problem triggered by following process:\n\n      P1(sda)\t\t\t\tP2(sdb)\n\t\t\techo 0 \u003e /sys/block/sdb/trace/enable\n\t\t\t  blk_trace_remove_queue\n\t\t\t    synchronize_rcu\n\t\t\t    blk_trace_free\n\t\t\t      relay_close\nrcu_read_lock\n__blk_add_trace\n  trace_note_tsk\n  (Iterate running_trace_list)\n\t\t\t        relay_close_buf\n\t\t\t\t  relay_destroy_buf\n\t\t\t\t    kfree(buf)\n    trace_note(sdb\u0027s bt)\n      relay_reserve\n        buf-\u003eoffset \u003c- nullptr deference (use-after-free) !!!\nrcu_read_unlock\n\n[  502.714379] BUG: kernel NULL pointer dereference, address:\n0000000000000010\n[  502.715260] #PF: supervisor read access in kernel mode\n[  502.715903] #PF: error_code(0x0000) - not-present page\n[  502.716546] PGD 103984067 P4D 103984067 PUD 17592b067 PMD 0\n[  502.717252] Oops: 0000 [#1] SMP\n[  502.720308] RIP: 0010:trace_note.isra.0+0x86/0x360\n[  502.732872] Call Trace:\n[  502.733193]  __blk_add_trace.cold+0x137/0x1a3\n[  502.733734]  blk_add_trace_rq+0x7b/0xd0\n[  502.734207]  blk_add_trace_rq_issue+0x54/0xa0\n[  502.734755]  blk_mq_start_request+0xde/0x1b0\n[  502.735287]  scsi_queue_rq+0x528/0x1140\n...\n[  502.742704]  sg_new_write.isra.0+0x16e/0x3e0\n[  502.747501]  sg_ioctl+0x466/0x1100\n\nReproduce method:\n  ioctl(/dev/sda, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\n  ioctl(/dev/sda, BLKTRACESTART)\n  ioctl(/dev/sdb, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\n  ioctl(/dev/sdb, BLKTRACESTART)\n\n  echo 0 \u003e /sys/block/sdb/trace/enable \u0026\n  // Add delay(mdelay/msleep) before kernel enters blk_trace_free()\n\n  ioctl$SG_IO(/dev/sda, SG_IO, ...)\n  // Enters trace_note_tsk() after blk_trace_free() returned\n  // Use mdelay in rcu region rather than msleep(which may schedule out)\n\nRemove blk_trace from running_list before calling blk_trace_free() by\nsysfs if blk_trace is at Blktrace_running state."
        }
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        "dateUpdated": "2024-11-04T12:04:42.277Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "blktrace: Fix uaf in blk_trace access after removing by sysfs",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47375",
    "datePublished": "2024-05-21T15:03:39.090Z",
    "dateReserved": "2024-05-21T14:58:30.811Z",
    "dateUpdated": "2024-11-04T12:04:42.277Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47375\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:23.290\",\"lastModified\":\"2024-10-27T14:35:02.110\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblktrace: Fix uaf in blk_trace access after removing by sysfs\\n\\nThere is an use-after-free problem triggered by following process:\\n\\n      P1(sda)\\t\\t\\t\\tP2(sdb)\\n\\t\\t\\techo 0 \u003e /sys/block/sdb/trace/enable\\n\\t\\t\\t  blk_trace_remove_queue\\n\\t\\t\\t    synchronize_rcu\\n\\t\\t\\t    blk_trace_free\\n\\t\\t\\t      relay_close\\nrcu_read_lock\\n__blk_add_trace\\n  trace_note_tsk\\n  (Iterate running_trace_list)\\n\\t\\t\\t        relay_close_buf\\n\\t\\t\\t\\t  relay_destroy_buf\\n\\t\\t\\t\\t    kfree(buf)\\n    trace_note(sdb\u0027s bt)\\n      relay_reserve\\n        buf-\u003eoffset \u003c- nullptr deference (use-after-free) !!!\\nrcu_read_unlock\\n\\n[  502.714379] BUG: kernel NULL pointer dereference, address:\\n0000000000000010\\n[  502.715260] #PF: supervisor read access in kernel mode\\n[  502.715903] #PF: error_code(0x0000) - not-present page\\n[  502.716546] PGD 103984067 P4D 103984067 PUD 17592b067 PMD 0\\n[  502.717252] Oops: 0000 [#1] SMP\\n[  502.720308] RIP: 0010:trace_note.isra.0+0x86/0x360\\n[  502.732872] Call Trace:\\n[  502.733193]  __blk_add_trace.cold+0x137/0x1a3\\n[  502.733734]  blk_add_trace_rq+0x7b/0xd0\\n[  502.734207]  blk_add_trace_rq_issue+0x54/0xa0\\n[  502.734755]  blk_mq_start_request+0xde/0x1b0\\n[  502.735287]  scsi_queue_rq+0x528/0x1140\\n...\\n[  502.742704]  sg_new_write.isra.0+0x16e/0x3e0\\n[  502.747501]  sg_ioctl+0x466/0x1100\\n\\nReproduce method:\\n  ioctl(/dev/sda, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\\n  ioctl(/dev/sda, BLKTRACESTART)\\n  ioctl(/dev/sdb, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\\n  ioctl(/dev/sdb, BLKTRACESTART)\\n\\n  echo 0 \u003e /sys/block/sdb/trace/enable \u0026\\n  // Add delay(mdelay/msleep) before kernel enters blk_trace_free()\\n\\n  ioctl$SG_IO(/dev/sda, SG_IO, ...)\\n  // Enters trace_note_tsk() after blk_trace_free() returned\\n  // Use mdelay in rcu region rather than msleep(which may schedule out)\\n\\nRemove blk_trace from running_list before calling blk_trace_free() by\\nsysfs if blk_trace is at Blktrace_running state.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: blktrace: corrige uaf en el acceso a blk_trace despu\u00e9s de eliminarlo mediante sysfs. Hay un problema de use after free desencadenado por el siguiente proceso: P1(sda) P2(sdb) echo 0 \u0026gt; /sys /block/sdb/trace/enable blk_trace_remove_queue sincronizar_rcu blk_trace_free rel\u00e9_cerrar rcu_read_lock __blk_add_trace trace_note_tsk (Iterar running_trace_list) rel\u00e9_close_buf rel\u00e9_destroy_buf kfree(buf) trace_note(sdb\u0027s bt) rel\u00e9_reserve buf-\u0026gt;offset \u0026lt;- deferencia nullptr (uso-despu\u00e9s) -gratis) !!! rcu_read_unlock [502.714379] ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000010 [502.715260] #PF: acceso de lectura de supervisor en modo kernel [502.715903] #PF: error_code(0x0000) - p\u00e1gina no presente [502.716546] PGD 103984067 P4D 103984067 PUD 17592b067 PMD 0 [ 502.717252] Vaya: 0000 [#1] SMP [ 502.720308] RIP: 0010:trace_note.isra.0+0x86/0x360 [ 502.732872] Seguimiento de llamadas: [ 502.733193] 0x1a3 [502.733734] blk_add_trace_rq+ 0x7b/0xd0 [ 502.734207] blk_add_trace_rq_issue+0x54/0xa0 [ 502.734755] blk_mq_start_request+0xde/0x1b0 [ 502.735287] scsi_queue_rq+0x528/0x1140 ... [ 502.7427 04] sg_new_write.isra.0+0x16e/0x3e0 [ 502.747501] sg_ioctl+0x466/0x1100 M\u00e9todo de reproducci\u00f3n: ioctl(/dev/sda, BLKTRACESETUP, blk_user_trace_setup[buf_size=127]) ioctl(/dev/sda, BLKTRACESTART) ioctl(/dev/sdb, BLKTRACESETUP, blk_user_trace_setup[buf_size=127]) ioctl(/dev/sdb , BLKTRACESTART) echo 0 \u0026gt; /sys/block/sdb/trace/enable \u0026amp; // Agrega retraso(mdelay/msleep) antes de que el kernel entre blk_trace_free() ioctl$SG_IO(/dev/sda, SG_IO, ...) // Entra trace_note_tsk() despu\u00e9s de que blk_trace_free() regresara // Utilice mdelay en la regi\u00f3n rcu en lugar de msleep (que puede programarse) Elimine blk_trace de running_list antes de llamar a blk_trace_free() mediante sysfs si blk_trace est\u00e1 en el estado Blktrace_running.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":6.2,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":2.5,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3815fe7371d2411ce164281cef40d9fc7b323dee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/488da313edf3abea7f7733efe011c96b23740ab5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5afedf670caf30a2b5a52da96eb7eac7dee6a9c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/677e362ba807f3aafe6f405c07e0b37244da5222\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5f8e86192612d0183047448d8bbe7918b3f1a26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d56171d9360c0170c5c5f8f7e2362a2e999eca40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dacfd5e4d1142bfb3809aab3634a375f6f373269\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebb8d26d93c3ec3c7576c52a8373a2309423c069\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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