| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "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 > /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's bt)\n relay_reserve\n buf->offset <- 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 > /sys/block/sdb/trace/enable &\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." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/trace/blktrace.c" |
| ], |
| "versions": [ |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "488da313edf3abea7f7733efe011c96b23740ab5", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "dacfd5e4d1142bfb3809aab3634a375f6f373269", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "d56171d9360c0170c5c5f8f7e2362a2e999eca40", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "677e362ba807f3aafe6f405c07e0b37244da5222", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "ebb8d26d93c3ec3c7576c52a8373a2309423c069", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "3815fe7371d2411ce164281cef40d9fc7b323dee", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "a5f8e86192612d0183047448d8bbe7918b3f1a26", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "c71a896154119f4ca9e89d6078f5f63ad60ef199", |
| "lessThan": "5afedf670caf30a2b5a52da96eb7eac7dee6a9c9", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/trace/blktrace.c" |
| ], |
| "versions": [ |
| { |
| "version": "2.6.30", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "2.6.30", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.4.286", |
| "lessThanOrEqual": "4.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.9.285", |
| "lessThanOrEqual": "4.9.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.14.249", |
| "lessThanOrEqual": "4.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.209", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.150", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.70", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.14.9", |
| "lessThanOrEqual": "5.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.4.286" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.9.285" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.14.249" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
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| "versionEndExcluding": "4.19.209" |
| }, |
| { |
| "vulnerable": true, |
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| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.4.150" |
| }, |
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| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.10.70" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.14.9" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.15" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/488da313edf3abea7f7733efe011c96b23740ab5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/dacfd5e4d1142bfb3809aab3634a375f6f373269" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d56171d9360c0170c5c5f8f7e2362a2e999eca40" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/677e362ba807f3aafe6f405c07e0b37244da5222" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ebb8d26d93c3ec3c7576c52a8373a2309423c069" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/3815fe7371d2411ce164281cef40d9fc7b323dee" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/a5f8e86192612d0183047448d8bbe7918b3f1a26" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/5afedf670caf30a2b5a52da96eb7eac7dee6a9c9" |
| } |
| ], |
| "title": "blktrace: Fix uaf in blk_trace access after removing by sysfs", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47375", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
