CVE-2021-47668

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"baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The vulnerable can_restart path runs after CAN bus-off recovery on real CAN interfaces; an attacker on the same CAN segment can induce bus-off (a known CAN bus-off attack), analogous to Bluetooth/Wi\u2011Fi adjacent reachability rather than internet Network or host-local only.\nAC:L - Bus-off can be reliably forced from the CAN bus, and with automatic recovery (restart-ms) configured\u2014documented and common in automotive/industrial deployments\u2014delayed work deterministically calls can_restart; netif_rx_ni runs softirq and can_receive always frees the skb before cf->len is read.\nPR:N - An adjacent CAN attacker needs no host account or capabilities; bus-off is triggered by on-bus error conditions and the kernel schedules can_restart when restart-ms is already enabled by the deployment.\nUI:N - No victim user action is required; bus-off and subsequent automatic restart occur from attacker-driven bus errors and kernel workqueue handling alone.\nS:U - This is a kernel-context use-after-free within the same host kernel authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - Use-after-free of the CAN error skb after netif_rx_ni frees it enables reading reallocated heap contents (cf aliases skb data), which per kernel UAF guidance is High confidentiality impact.\nI:H - Kernel UAF of an sk_buff object is treated as enabling heap reuse and control-flow/corruption primitives, so Integrity is High even though the immediate buggy access is a post-free read into stats.\nA:H - Dereferencing freed skb memory can oops/panic the kernel, and any use-after-free is scored High for availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/can/dev.c"], "versions": [{"version": 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"can: dev: can_restart: fix use after free bug", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:A - The vulnerable can_restart path runs after CAN bus-off recovery on real CAN interfaces; an attacker on the same CAN segment can induce bus-off (a known CAN bus-off attack), analogous to Bluetooth/Wi\u2011Fi adjacent reachability rather than internet Network or host-local only.\nAC:L - Bus-off can be reliably forced from the CAN bus, and with automatic recovery (restart-ms) configured\u2014documented and common in automotive/industrial deployments\u2014delayed work deterministically calls can_restart; netif_rx_ni runs softirq and can_receive always frees the skb before cf->len is read.\nPR:N - An adjacent CAN attacker needs no host account or capabilities; bus-off is triggered by on-bus error conditions and the kernel schedules can_restart when restart-ms is already enabled by the deployment.\nUI:N - No victim user action is required; bus-off and subsequent automatic restart occur from attacker-driven bus errors and kernel workqueue handling alone.\nS:U - This is a kernel-context use-after-free within the same host kernel authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - Use-after-free of the CAN error skb after netif_rx_ni frees it enables reading reallocated heap contents (cf aliases skb data), which per kernel UAF guidance is High confidentiality impact.\nI:H - Kernel UAF of an sk_buff object is treated as enabling heap reuse and control-flow/corruption primitives, so Integrity is High even though the immediate buggy access is a post-free read into stats.\nA:H - Dereferencing freed skb memory can oops/panic the kernel, and any use-after-free is scored High for availability."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "260925a0b7d2da5449f8ecfd02c1405e0c8a45b8", "versionType": "git"}, {"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "bbc6847b9b8978b520f62fbc7c68c54ef0f8d282", "versionType": "git"}, {"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "92668d28c7e6a7a2ba07df287669ffcdf650c421", "versionType": "git"}, {"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "08ab951787098ae0b6c0364aeea7a8138226f234", "versionType": "git"}, {"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "ac48ef15826e83f4206c47add61072e8fc76d328", "versionType": "git"}, {"status": "affected", "version": "39549eef3587f1c1e8c65c88a2400d10fd30ea17", "lessThan": "593c072b7b3c4d7044416eb039d9ad706bedd67a", "versionType": "git"}, {"status": "affected", 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Tras llamar a netif_rx_ni(skb), desreferenciar skb no es seguro. En particular, se accede al cf can_frame, que crea un alias de memoria skb, despu\u00e9s de netif_rx_ni() en: stats->rx_bytes += cf->len;. Reordenar las l\u00edneas soluciona el problema."}], "id": "CVE-2021-47668", "lastModified": "2026-08-04T10:17:12.543", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47668", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-17T18:17:56.944235Z", "version": "2.0.3"}}]}, "published": "2025-04-17T18:15:43.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: can: dev: can_restart: fix use after free bug", "id": "2360785", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360785"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/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:\ncan: dev: can_restart: fix use after free bug\nAfter calling netif_rx_ni(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is accessed\nafter the netif_rx_ni() in:\nstats->rx_bytes += cf->len;\nReordering the lines solves the issue."], "name": "CVE-2021-47668", "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": "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": "2025-04-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47668\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47668\nhttps://lore.kernel.org/linux-cve-announce/2025041734-CVE-2021-47668-c0de@gregkh/T"], "threat_severity": "Moderate"}

{}