CVE-2021-47412

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47412", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.817Z", "datePublished": "2024-05-21T15:04:03.309Z", "dateUpdated": "2026-08-05T08:47:43.235Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:43.235Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't call rq_qos_ops->done_bio if the bio isn't tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn't to be called for bio based driver\n\n2) rq_qos_done_bio() needn't to be called for bio which isn't tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio->bi_bdev->bd_disk->queue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q->rq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops->done_bio if\nthe bio isn't tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn't tracked."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in block-layer bio_endio()/rq_qos_done_bio(), reached by local I/O submission (syscalls to a block device or filesystem on it) racing device/queue teardown, not by parsing remote protocol packets.\nAC:L - An attacker who can issue concurrent I/O and induce queue teardown (e.g. write to removable/loop/NBD media then eject/disconnect) controls both sides of the race; rq_qos_done_bio() has no lock versus rq_qos_exit(), so the UAF is reliably triggerable.\nPR:L - Unprivileged local users can write to user-accessible block devices (removable media, permitted loop/NBD nodes) and trigger teardown via eject/unmount paths available to the mounting user; root in the init namespace is not required.\nUI:N - The attacker performs the I/O and device teardown/eject themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel (UAF/panic or local privilege escalation) and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - rq_qos_exit() frees rq_qos objects while bio_endio() may still load q->rq_qos and walk rqos->ops/next on reallocated slab memory, giving an attacker-controlled UAF read primitive.\nI:H - __rq_qos_done_bio() invokes rqos->ops->done_bio on the freed object, so heap reuse can hijack the function pointer for arbitrary write / control-flow hijacking, not merely a crash.\nA:H - The same UAF produces kernel oops/panic when done_bio runs against freed rq_qos or a freed request_queue, fully impacting availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/bio.c"], "versions": [{"version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "db60edbfff332a6a5477c367af8125f034570989", "status": "affected", "versionType": "git"}, {"version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "004b8f8a691205a93d9e80d98b786b2b97424d6e", "status": "affected", "versionType": "git"}, {"version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "a647a524a46736786c95cdb553a070322ca096e3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/bio.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.11", "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": "4.19", "versionEndExcluding": "5.10.241"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.14.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/db60edbfff332a6a5477c367af8125f034570989"}, {"url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e"}, {"url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3"}], "title": "block: don't call rq_qos_ops->done_bio if the bio isn't tracked", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-11T17:28:47.066559Z", "id": "CVE-2021-47412", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-11T17:29:00.823Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:30:56.004Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:30:56.004Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47412", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-11T17:28:47.066559Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-11T17:28:53.752Z"}}], "cna": {"title": "block: don't call rq_qos_ops->done_bio if the bio isn't tracked", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in block-layer bio_endio()/rq_qos_done_bio(), reached by local I/O submission (syscalls to a block device or filesystem on it) racing device/queue teardown, not by parsing remote protocol packets.\nAC:L - An attacker who can issue concurrent I/O and induce queue teardown (e.g. write to removable/loop/NBD media then eject/disconnect) controls both sides of the race; rq_qos_done_bio() has no lock versus rq_qos_exit(), so the UAF is reliably triggerable.\nPR:L - Unprivileged local users can write to user-accessible block devices (removable media, permitted loop/NBD nodes) and trigger teardown via eject/unmount paths available to the mounting user; root in the init namespace is not required.\nUI:N - The attacker performs the I/O and device teardown/eject themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel (UAF/panic or local privilege escalation) and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - rq_qos_exit() frees rq_qos objects while bio_endio() may still load q->rq_qos and walk rqos->ops/next on reallocated slab memory, giving an attacker-controlled UAF read primitive.\nI:H - __rq_qos_done_bio() invokes rqos->ops->done_bio on the freed object, so heap reuse can hijack the function pointer for arbitrary write / control-flow hijacking, not merely a crash.\nA:H - The same UAF produces kernel oops/panic when done_bio runs against freed rq_qos or a freed request_queue, fully impacting availability."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "db60edbfff332a6a5477c367af8125f034570989", "versionType": "git"}, {"status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "004b8f8a691205a93d9e80d98b786b2b97424d6e", "versionType": "git"}, {"status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "lessThan": "a647a524a46736786c95cdb553a070322ca096e3", "versionType": "git"}], "programFiles": ["block/bio.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"status": "unaffected", "version": "0", "lessThan": "4.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.241", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.11", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["block/bio.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/db60edbfff332a6a5477c367af8125f034570989"}, {"url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e"}, {"url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't call rq_qos_ops->done_bio if the bio isn't tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn't to be called for bio based driver\n\n2) rq_qos_done_bio() needn't to be called for bio which isn't tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio->bi_bdev->bd_disk->queue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q->rq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops->done_bio if\nthe bio isn't tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn't tracked."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.241", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.11", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "4.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:43.235Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47412", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:43.235Z", "dateReserved": "2024-05-21T14:58:30.817Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:04:03.309Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["block/bio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "db60edbfff332a6a5477c367af8125f034570989", "status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "versionType": "git"}, {"lessThan": "004b8f8a691205a93d9e80d98b786b2b97424d6e", "status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "versionType": "git"}, {"lessThan": "a647a524a46736786c95cdb553a070322ca096e3", "status": "affected", "version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["block/bio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"lessThan": "4.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.241", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AC788FBF-3063-4B89-9406-EA698F0B9B1C", "versionEndExcluding": "5.10.241", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9E845F47-DE3A-41CF-BB74-007A8AF3E47C", "versionEndExcluding": "5.14.11", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't call rq_qos_ops->done_bio if the bio isn't tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn't to be called for bio based driver\n\n2) rq_qos_done_bio() needn't to be called for bio which isn't tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio->bi_bdev->bd_disk->queue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q->rq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops->done_bio if\nthe bio isn't tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn't tracked."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: no llame a rq_qos_ops->done_bio si no se realiza un seguimiento de la biograf\u00eda. El framework rq_qos solo se aplica en el controlador basado en solicitudes, por lo que: 1) rq_qos_done_bio() no necesita hacerlo ser llamado para un controlador basado en biograf\u00eda 2) No es necesario llamar a rq_qos_done_bio() para una biograf\u00eda que no est\u00e1 rastreada, como una biograf\u00eda terminada por un c\u00f3digo de manejo de errores. Especialmente en bio_endio(): 1) la cola de solicitudes se remite a trav\u00e9s de bio->bi_bdev->bd_disk->queue, que puede desaparecer ya que el recuento de la cola de solicitudes no se puede mantener en los dos casos anteriores 2) q->rq_qos se puede liberar en blk_cleanup_queue() al llamar a __rq_qos_done_bio() Solucione el posible p\u00e1nico del kernel al no llamar a rq_qos_ops->done_bio si no se realiza un seguimiento de la biograf\u00eda. Esta forma es segura porque tanto ioc_rqos_done_bio() como blkcg_iolatency_done_bio() no funcionan si no se realiza un seguimiento de la biograf\u00eda."}], "id": "CVE-2021-47412", "lastModified": "2026-08-04T10:17:02.490", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47412", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-11T17:28:47.066559Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:26.700", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db60edbfff332a6a5477c367af8125f034570989"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}], "bugzilla": {"description": "kernel: block: don't call rq_qos_ops->done_bio if the bio isn't tracked", "id": "2282324", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282324"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-388", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblock: don't call rq_qos_ops->done_bio if the bio isn't tracked\nrq_qos framework is only applied on request based driver, so:\n1) rq_qos_done_bio() needn't to be called for bio based driver\n2) rq_qos_done_bio() needn't to be called for bio which isn't tracked,\nsuch as bios ended from error handling code.\nEspecially in bio_endio():\n1) request queue is referred via bio->bi_bdev->bd_disk->queue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n2) q->rq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\nFix the potential kernel panic by not calling rq_qos_ops->done_bio if\nthe bio isn't tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn't tracked.", "A vulnerability was found in the Linux kernel, where improper handling of block I/O requests when a block I/O request (bio) is not tracked, the kernel erroneously calls the rq_qos_ops->done_bio function, potentially leading to use-after-free issues. This situation can occurr when the request queue is accessed after it has been freed, resulting in possible kernel panic."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47412", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47412\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47412\nhttps://lore.kernel.org/linux-cve-announce/2024052152-CVE-2021-47412-b362@gregkh/T"], "statement": "This vulnerability is classified as moderate severity, as the issue can cause kernel panics, leading to system crashes. However, it does not affect data confidentiality or integrity.", "threat_severity": "Moderate"}

{}