CVE-2021-46998

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The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961."}], "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 UAF is in enic ndo_start_xmit (enic_hard_start_xmit \u2192 enic_queue_wq_skb \u2192 skb_tx_timestamp), reached when a local process transmits via ordinary socket send over an enic netdev; remote peers do not enter this TX-prepare path.\nAC:L - Once DMA mapping fails, the free-then-skb_tx_timestamp UAF is deterministic with no race; a local attacker can induce mapping failure by exhausting swiotlb/IOMMU resources, which is within attacker influence.\nPR:L - Any unprivileged local user can send packets out an up enic interface through the generic networking stack; no CAP_NET_ADMIN or other capability is required on the transmit path.\nUI:N - The attacker triggers the TX path and resource exhaustion themselves via their own send syscalls; no victim action is required.\nS:U - This is a standard in-kernel skb heap UAF enabling local privilege escalation within the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free of the skb (skb_shinfo/tx_flags access, and skb_tstamp_tx when SKBTX_SW_TSTAMP is set) allows heap spraying and reuse of the freed object, enabling arbitrary kernel memory disclosure primitives.\nI:H - The same skb UAF enables heap corruption and write/control-flow hijack primitives after reclaim, per UAF exploitation guidance.\nA:H - Accessing the freed skb in skb_tx_timestamp reliably causes kernel oops/panic even without a full exploit."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/cisco/enic/enic_main.c"], "versions": [{"version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", 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remote peers do not enter this TX-prepare path.\nAC:L - Once DMA mapping fails, the free-then-skb_tx_timestamp UAF is deterministic with no race; a local attacker can induce mapping failure by exhausting swiotlb/IOMMU resources, which is within attacker influence.\nPR:L - Any unprivileged local user can send packets out an up enic interface through the generic networking stack; no CAP_NET_ADMIN or other capability is required on the transmit path.\nUI:N - The attacker triggers the TX path and resource exhaustion themselves via their own send syscalls; no victim action is required.\nS:U - This is a standard in-kernel skb heap UAF enabling local privilege escalation within the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free of the skb (skb_shinfo/tx_flags access, and skb_tstamp_tx when SKBTX_SW_TSTAMP is set) allows heap spraying and reuse of the freed object, enabling arbitrary kernel memory disclosure primitives.\nI:H - The same skb UAF enables heap corruption and write/control-flow hijack primitives after reclaim, per UAF exploitation guidance.\nA:H - Accessing the freed skb in skb_tx_timestamp reliably causes kernel oops/panic even without a full exploit."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "25a87b1f566b5eb2af2857a928f0e2310d900976", "versionType": "git"}, {"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "f7f6f07774091a6ddd98500b85386c3c6afb30d3", "versionType": "git"}, {"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "7afdd6aba95c8a526038e7abe283eeac3e4320f1", "versionType": "git"}, {"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "6892396ebf04ea2c021d80e10f4075e014cd7cc3", "versionType": "git"}, {"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "d90529392aaf498dafa95d212295d64b2cea4e24", "versionType": "git"}, {"status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "lessThan": "643001b47adc844ae33510c4bb93c236667008a3", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/cisco/enic/enic_main.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.16"}, {"status": "unaffected", "version": "0", "lessThan": "4.16", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.191", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.120", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.38", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11.22", "versionType": "semver", "lessThanOrEqual": "5.11.*"}, {"status": "unaffected", "version": "5.12.5", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/cisco/enic/enic_main.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"}, {"url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"}, {"url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"}, {"url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"}, {"url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"}, {"url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\n\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/cisco/enic/enic_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "25a87b1f566b5eb2af2857a928f0e2310d900976", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}, {"lessThan": "f7f6f07774091a6ddd98500b85386c3c6afb30d3", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}, {"lessThan": "7afdd6aba95c8a526038e7abe283eeac3e4320f1", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}, {"lessThan": "6892396ebf04ea2c021d80e10f4075e014cd7cc3", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}, {"lessThan": "d90529392aaf498dafa95d212295d64b2cea4e24", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}, {"lessThan": "643001b47adc844ae33510c4bb93c236667008a3", "status": "affected", "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/cisco/enic/enic_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.16"}, {"lessThan": "4.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.191", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.120", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.38", "versionType": "semver"}, {"lessThanOrEqual": "5.11.*", "status": "unaffected", "version": "5.11.22", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F677F1C8-2451-43EC-9555-E283697C189E", "versionEndExcluding": "4.19.191", "versionStartIncluding": "4.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2BDC71CF-4451-4D53-93E9-61DE7C4E25B0", "versionEndExcluding": "5.4.120", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2BB4E5E8-4AAD-475A-A1B9-F287254C7D72", "versionEndExcluding": "5.10.38", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "83B53E9A-F426-4C03-9A5F-A931FF79827E", "versionEndExcluding": "5.11.22", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0274929A-B36C-4F4C-AB22-30A0DD6B995B", "versionEndExcluding": "5.12.5", "versionStartIncluding": "5.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\n\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ethernet:enic: corrige un error de use after free en enic_hard_start_xmit. En enic_hard_start_xmit, llama a enic_queue_wq_skb(). Dentro de enic_queue_wq_skb, si ocurre alg\u00fan error, dev_kfree_skb(skb) liberar\u00e1 el skb. Pero el skb liberado todav\u00eda se usa en skb_tx_timestamp(skb). Mi parche hace que enic_queue_wq_skb() devuelva un error y vaya a spin_unlock() en caso de error. La soluci\u00f3n la proporciona Govind. Consulte https://lkml.org/lkml/2021/4/30/961."}], "id": "CVE-2021-46998", "lastModified": "2026-08-04T10:16:40.587", "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": 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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-46998", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:00:51.946004Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:38.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit", "id": "2266877", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266877"}, "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-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961.", "A use-after-free flaw was found in the Linux kernel's Cisco VIC Ethernet NIC Support driver. This issue occurs due to the way some errors happen inside enic_queue_wq_skb and could allow a local user to crash the system."], "name": "CVE-2021-46998", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"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": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46998\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46998\nhttps://lore.kernel.org/linux-cve-announce/2024022827-CVE-2021-46998-eda2@gregkh/T/#u"], "threat_severity": "Moderate"}

{}