CVE-2022-49921

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up the qdisc hierarchy in their namespace, they can trigger the UAF by sending packets themselves with no victim interaction.\nS:U - This is a standard in-kernel memory corruption/privilege-escalation issue within the same OS security authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - This is a use-after-free on an sk_buff; per CVSS kernel guidance, UAFs enable control of freed object contents and are scored as High confidentiality impact.\nI:H - Use-after-free of sk_buff enables heap reuse/spraying and can be leveraged for arbitrary write or control-flow hijacking, so Integrity is High.\nA:H - Use-after-free of a freed skb can cause kernel oops/panic when the reclaimed memory is accessed or unmapped, so Availability is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_red.c"], "versions": [{"version": 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[{"url": "https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619"}, {"url": "https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db"}, {"url": "https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a"}, {"url": "https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2"}, {"url": "https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36"}, {"url": "https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa"}, {"url": "https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e"}, {"url": "https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9"}], "title": "net: sched: Fix use after free in red_enqueue()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", 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Use-after-free of sk_buff enables heap reuse/spraying and can be leveraged for arbitrary write or control-flow hijacking, so Integrity is High.\nA:H - Use-after-free of a freed skb can cause kernel oops/panic when the reclaimed memory is accessed or unmapped, so Availability is High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "795afe0b9bb6c915f0299a8e309936519be01619", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "a238cdcf2bdc72207c74375fc8be13ee549ca9db", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "e877f8fa49fbccc63cb2df2e9179bddc695b825a", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "52e0429471976785c155bfbf51d80990c6cd46e2", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "5960b9081baca85cc7dcb14aec1de85999ea9d36", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "fc4b50adb400ee5ec527a04073174e8e73a139fa", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "170e5317042c302777ed6d59fdb84af9b0219d4e", "versionType": "git"}, {"status": "affected", "version": "d7f4f332f082c4d4ba53582f902ed6b44fd6f45e", "lessThan": "8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9", "versionType": "git"}, {"status": "affected", "version": "ab0b3b9dbf559a5633d460e748144697bd2d3aa3", "versionType": "git"}, {"status": "affected", "version": "4.4.163", "lessThan": "4.5", "versionType": "semver"}], "programFiles": ["net/sched/sch_red.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.7"}, {"status": "unaffected", "version": "0", "lessThan": "4.7", "versionType": "semver"}, {"status": "unaffected", "version": "4.9.333", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.299", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.265", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.224", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.154", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.78", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.0.8", "versionType": "semver", "lessThanOrEqual": "6.0.*"}, {"status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/sch_red.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619"}, {"url": "https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db"}, {"url": "https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a"}, {"url": "https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2"}, {"url": "https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36"}, {"url": "https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa"}, {"url": "https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e"}, {"url": "https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: Fix use after free in red_enqueue()\n\nWe can't use \"skb\" again after passing it to qdisc_enqueue(). 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This is\nbasically identical to commit 2f09707d0c97 (\"sch_sfb: Also store skb\nlen before calling child enqueue\")."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: sched: Se corrige el use after free en red_enqueue(). No podemos volver a usar \"skb\" despu\u00e9s de pasarlo a qdisc_enqueue(). Esto es pr\u00e1cticamente id\u00e9ntico a el commit 2f09707d0c97 (\"sch_sfb: Tambi\u00e9n se almacena la longitud de skb antes de llamar a la cola secundaria\")."}], "id": "CVE-2022-49921", "lastModified": "2026-06-17T05:19:31.213", "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": "nvd@nist.gov", "type": "Primary"}, {"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-2022-49921", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T14:58:28.989555Z", "version": "2.0.3"}}]}, "published": "2025-05-01T15:16:17.627", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: sched: Fix use after free in red_enqueue()", "id": "2363452", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363452"}, "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:H/A:N", "status": "draft"}, "cwe": "CWE-681", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: sched: Fix use after free in red_enqueue()\nWe can't use \"skb\" again after passing it to qdisc_enqueue(). This is\nbasically identical to commit 2f09707d0c97 (\"sch_sfb: Also store skb\nlen before calling child enqueue\")."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module sch_red from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2022-49921", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49921\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49921\nhttps://lore.kernel.org/linux-cve-announce/2025050108-CVE-2022-49921-e4fc@gregkh/T"], "statement": "The bug could happen only when qdisc with Random Early Detection (RED) packet scheduling algorithm being used. The security impact is limited.", "threat_severity": "Moderate"}

{}