CVE-2024-42108

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Since `skb` and `gq->skbs[gq->dirty]` are in fact the\nsame pointer, the skb is first freed using dev_kfree_skb_any(), then the\nvalue in skb->len is used to update the interface statistics.\n\nLet's move around the instructions to use skb->len before the skb is\nfreed.\n\nThis bug is trivial to reproduce using KFENCE. It will trigger a splat\nevery few packets. A simple ARP request or ICMP echo request is enough."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The UAF fires on every hardware TX completion, and an unauthenticated remote host reaches it simply by sending any packet that elicits a reply (ICMP echo request, TCP SYN to a closed port, any service response) \u2014 all routable across L3, not just link-local. The fix commit itself states an ARP or ICMP echo request is sufficient to trigger it.\nAC:L - There is no race, no timing window, and no memory-layout precondition \u2014 `skb->len` is read unconditionally one statement after `dev_kfree_skb_any()` on every TX-completed skb, and the attacker sets the pace by sending packets. The commit reports a splat \"every few packets,\" so even the KFENCE-guarded-slot case is hit trivially by a sustained flood.\nPR:N - The reply packet is generated by the kernel network stack before any application-layer authentication, so no credentials, session, or account on the target are needed. Recovering the leaked word afterwards requires only a world-readable counter in `/proc/net/dev`.\nUI:N - The attacker sends the packets themselves and the TX-completion NAPI poll runs autonomously; no victim login, mount, file open, or any other action is involved.\nS:U - The use-after-free read, the leaked freelist word, and the resulting fault all stay inside the kernel's own memory and the rswitch driver's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Because `skbuff_head_cache` has no ctor/RCU/poison flags, SLUB places the freelist pointer at ~offset 112 \u2014 precisely where `skb->len` sits \u2014 so the freed-memory read pulls the low 32 bits of a kernel heap pointer and adds it into `stats.tx_bytes`, which `rswitch_get_stats()` exports verbatim to `/proc/net/dev` and sysfs. Differencing the counter around a single TX completion recovers that word exactly and repeatably, giving a reliable kernel heap-address/KASLR disclosure; per kernel scoring guidance a use-after-free is High regardless.\nI:H - This is a use-after-free on an object in the general-purpose `skbuff_head_cache`, which per kernel scoring guidance is rated High since freed-object accesses in that cache are the standard primitive for heap grooming and control-flow corruption. Concretely, kernel-maintained interface accounting is corrupted with freed slab contents, poisoning the statistics that monitoring and traffic-accounting decisions rely on.\nA:H - On the many kernels shipping `CONFIG_KFENCE=y` (Android GKI, Fedora, RHEL, Ubuntu, hardened automotive builds) the freed object's page is unmapped, so the `skb->len` read page-faults into `kfence_report_error()`, which calls `check_panic_on_warn(\"KFENCE\")` \u2014 an immediate kernel panic on the fail-fast configurations typical for an in-vehicle R-Car S4 gateway. A remote attacker can drive this indefinitely with a ping flood, and any use-after-free is rated 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/ethernet/renesas/rswitch.c"], "versions": [{"version": "0aeec4bb6a9fc963932bf3c929bdf27d835d44e9", "lessThan": "4a41bb9f2b402469d425a1c13359d3b3ea4e6403", "status": "affected", "versionType": "git"}, {"version": "271e015b91535dd87fd0f5df0cc3b906c2eddef9", "lessThan": "92cbbe7759193e3418f38d0d73f8fe125312c58b", "status": "affected", "versionType": "git"}, {"version": "271e015b91535dd87fd0f5df0cc3b906c2eddef9", "lessThan": "9a0c28efeec6383ef22e97437616b920e7320b67", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/renesas/rswitch.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.9", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "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": "6.8", "versionEndExcluding": "6.9.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4a41bb9f2b402469d425a1c13359d3b3ea4e6403"}, {"url": "https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b"}, {"url": "https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67"}], "title": "net: rswitch: Avoid use-after-free in rswitch_poll()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:54:32.138Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-42108", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:17:39.409257Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:07.014Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/renesas/rswitch.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4a41bb9f2b402469d425a1c13359d3b3ea4e6403", "status": "affected", "version": "0aeec4bb6a9fc963932bf3c929bdf27d835d44e9", "versionType": "git"}, {"lessThan": "92cbbe7759193e3418f38d0d73f8fe125312c58b", "status": "affected", "version": "271e015b91535dd87fd0f5df0cc3b906c2eddef9", "versionType": "git"}, {"lessThan": "9a0c28efeec6383ef22e97437616b920e7320b67", "status": "affected", "version": "271e015b91535dd87fd0f5df0cc3b906c2eddef9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/renesas/rswitch.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5726EB4D-ED18-4DEC-B0C0-A525D33487E1", "versionEndExcluding": "6.9.9", "versionStartIncluding": "6.8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rswitch: Avoid use-after-free in rswitch_poll()\n\nThe use-after-free is actually in rswitch_tx_free(), which is inlined in\nrswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the\nsame pointer, the skb is first freed using dev_kfree_skb_any(), then the\nvalue in skb->len is used to update the interface statistics.\n\nLet's move around the instructions to use skb->len before the skb is\nfreed.\n\nThis bug is trivial to reproduce using KFENCE. It will trigger a splat\nevery few packets. A simple ARP request or ICMP echo request is enough."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: rswitch: Evite el use after free en rswitch_poll() El use after free est\u00e1 en realidad en rswitch_tx_free(), que est\u00e1 incluido en rswitch_poll(). Dado que `skb` y `gq->skbs[gq->dirty]` son de hecho el mismo puntero, el skb primero se libera usando dev_kfree_skb_any(), luego el valor en skb->len se usa para actualizar las estad\u00edsticas de la interfaz. Avancemos por las instrucciones para usar skb->len antes de liberar el skb. Este error es trivial de reproducir usando KFENCE. Activar\u00e1 un sonido cada pocos paquetes. Una simple solicitud ARP o una solicitud de eco ICMP es suficiente."}], "id": "CVE-2024-42108", "lastModified": "2026-08-04T11:19:34.667", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "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-2024-42108", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:17:39.409257Z", "version": "2.0.3"}}]}, "published": "2024-07-30T08:15:03.333", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4a41bb9f2b402469d425a1c13359d3b3ea4e6403"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: rswitch: Avoid use-after-free in rswitch_poll()", "id": "2301471", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2301471"}, "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:\nnet: rswitch: Avoid use-after-free in rswitch_poll()\nThe use-after-free is actually in rswitch_tx_free(), which is inlined in\nrswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the\nsame pointer, the skb is first freed using dev_kfree_skb_any(), then the\nvalue in skb->len is used to update the interface statistics.\nLet's move around the instructions to use skb->len before the skb is\nfreed.\nThis bug is trivial to reproduce using KFENCE. It will trigger a splat\nevery few packets. A simple ARP request or ICMP echo request is enough.", "A use-after-free was found in the Linux kernel network (Ethernet) card Renesas driver. This issue could allow a local user to crash the system."], "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-2024-42108", "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: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": "2024-07-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42108\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42108\nhttps://lore.kernel.org/linux-cve-announce/2024073021-CVE-2024-42108-7e70@gregkh/T"], "statement": "Red Hat Enterprise Linux is not affected.", "threat_severity": "Moderate"}

{}