CVE-2022-49411

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Fix the problem by making sure we always operate on\nonline bfq_group. 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cgroup offline sequence themselves; no separate victim action is needed.\nS:U - This is a kernel heap use-after-free enabling privilege escalation within the same kernel security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of bfq_group on the BFQ service tree allows reclaim and reuse of the freed object, yielding an arbitrary kernel read primitive.\nI:H - The same UAF on service-tree-linked bfq_group memory enables heap spray and corrupted scheduler entities, providing arbitrary write / control-flow hijack potential.\nA:H - Walking freed bfq_group entities in the service tree causes kernel oops/panic (as seen in related BFQ KASAN UAF reports), so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/bfq-cgroup.c"], "versions": [{"version": "e21b7a0b988772e82e7147e1c659a5afe2ae003c", 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This may then cause insertion of this bfq_group\ninto a service tree. But this bfq_group will get freed as soon as last\nbio associated with it is completed leading to use after free issues for\nservice tree users. Fix the problem by making sure we always operate on\nonline bfq_group. If the bfq_group associated with the bio is not\nonline, we pick the first online parent."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bfq: Aseg\u00farese de que bfqg para el que estamos poniendo en cola las solicitudes est\u00e9 en l\u00ednea. Las BIOS en cola en el programador de E/S de BFQ se pueden asociar con un cgroup que ya estaba fuera de l\u00ednea. Esto puede provocar la inserci\u00f3n de este bfq_group en un \u00e1rbol de servicios. Pero este bfq_group se liberar\u00e1 tan pronto como se complete la \u00faltima bio asociada con \u00e9l, lo que genera problemas de use-after-free para los usuarios del \u00e1rbol de servicios. Solucione el problema asegur\u00e1ndose de que siempre operamos en bfq_group en l\u00ednea. Si el bfq_group asociado con la bio no est\u00e1 en l\u00ednea, elegimos el primer padre en l\u00ednea."}], "id": "CVE-2022-49411", "lastModified": "2026-06-17T05:17:58.397", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49411", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-03-05T21:14:17.027775Z", "version": "2.0.3"}}]}, "published": "2025-02-26T07:01:17.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ccddf8cd411c1800863ed357064e56ceffd356bb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bfq: Make sure bfqg for which we are queueing requests is online", "id": "2347861", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347861"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbfq: Make sure bfqg for which we are queueing requests is online\nBios queued into BFQ IO scheduler can be associated with a cgroup that\nwas already offlined. This may then cause insertion of this bfq_group\ninto a service tree. But this bfq_group will get freed as soon as last\nbio associated with it is completed leading to use after free issues for\nservice tree users. Fix the problem by making sure we always operate on\nonline bfq_group. If the bfq_group associated with the bio is not\nonline, we pick the first online parent.", "A use-after-free vulnerability exists in the Linux kernel. The Bios queued into the BFQ IO scheduler can be associated with a cgroup that was already offline. This issue may then cause the insertion of this bfq_group into a service tree. This bfq_group will get freed as soon as the last associated bio is completed, leading to use-after-free issues for service tree users and denial of service issues."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2022-49411", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49411\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49411\nhttps://lore.kernel.org/linux-cve-announce/2025022652-CVE-2022-49411-63ad@gregkh/T"], "threat_severity": "Moderate"}

{}