CVE-2025-39827

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Specifically, this patch adds incrementing\nand decrementing of rose_neigh->use when rose_neigh->count is incremented\nor decremented.\n\nThis patch also modifies rose_rt_free(), rose_rt_device_down() and\nrose_clear_route() to properly release references to rose_neigh objects\nbefore freeing a rose_node through rose_remove_node().\n\nThese changes ensure rose_neigh structures are properly freed only when\nall references, including those from rose_node structures, are released.\nAs a result, this resolves a slab-use-after-free issue reported by Syzbot."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The dangling `rose_node->neighbour[]` entries are consumed by `rose_route_frame()` \u2192 `rose_get_neigh(..., route_frame=1)` and `rose_rx_call_request()`, which run entirely on ROSE frames received from unauthenticated AX.25 peers. AX.25 rides radio links, KISS/serial TNCs, or bpqether (ETH_P_BPQ) on the local Ethernet segment, so the attacker must be link-adjacent rather than internet-routable.\nAC:L - The attacker drives both sides \u2014 flooding CALL_REQUEST/CLEAR_REQUEST frames to force the frame-driven `rose_neigh_put()` paths in `rose_in.c`/`rose_link_failed()` while route/device churn tears down `rose_node`s that never held a `use` reference \u2014 and per guidance a use-after-free the attacker creates is Low.\nPR:N - ROSE and AX.25 have no authentication, so a peer injecting frames on the segment needs no credentials to reach `rose_route_frame()`/`rose_rx_call_request()` and dereference the freed `rose_neigh`; unprivileged local `connect()` and `/proc/net/rose_nodes` reach the same stale pointers.\nUI:N - Only received frames and ordinary ROSE connection/route churn on a host with ROSE routing configured are needed; no local user has to open a file, mount anything, or take any other action.\nS:U - The corruption is confined to kernel heap objects within the kernel's own security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed `rose_neigh` slot is demonstrably recycled by unrelated kmalloc allocations (KASAN shows the slot reused by kernfs buffers), so an attacker can spray controlled data and have the kernel read it back through `node->neighbour[i]`, `rose->neighbour`, and `rose_route->neigh1/2`, yielding kernel memory disclosure.\nI:H - `rose_neigh_hold()`/`rose_neigh_put()` on the dangling pointer perform refcount read-modify-writes into a reclaimed object, and stale `rose->neighbour`/`rose_route->neigh` plus the object's embedded `timer_list` function pointers and `sk_buff_head` give write and double-free primitives with plausible control-flow hijack.\nA:H - The freed neighbour still has armed `ftimer`/`t0timer` and live pointers from routes, nodes and sockets, so the UAF reliably produces a kernel oops/panic \u2014 as syzbot reproduced thousands of times \u2014 and can be re-triggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rose/rose_route.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4cce478c3e82a5fc788d72adb2f4c4e983997639", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9c547c8eee9d1cf6e744611d688b9f725cf9a115", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d7563b456ed44151e1a82091d96f60166daea89b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "384210cceb1873a4c8218b27ba0745444436b728", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": 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{}

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separate reference counting\nmechanisms: the 'count' field in struct rose_neigh tracks references from\nrose_node structures, while the 'use' field (now refcount_t) tracks\nreferences from rose_sock.\n\nThis patch merges these two reference counting systems using 'use' field\nfor proper reference management. Specifically, this patch adds incrementing\nand decrementing of rose_neigh->use when rose_neigh->count is incremented\nor decremented.\n\nThis patch also modifies rose_rt_free(), rose_rt_device_down() and\nrose_clear_route() to properly release references to rose_neigh objects\nbefore freeing a rose_node through rose_remove_node().\n\nThese changes ensure rose_neigh structures are properly freed only when\nall references, including those from rose_node structures, are released.\nAs a result, this resolves a slab-use-after-free issue reported by Syzbot."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: rose: incluir referencias de nodo en el recuento de referencias de rose_neigh\n\nLa implementaci\u00f3n actual mantiene dos mecanismos de recuento de referencias separados: el campo 'count' en la estructura rose_neigh rastrea las referencias de las estructuras rose_node, mientras que el campo 'use' (ahora refcount_t) rastrea las referencias de rose_sock.\n\nEste parche fusiona estos dos sistemas de recuento de referencias utilizando el campo 'use' para una gesti\u00f3n adecuada de las referencias. Espec\u00edficamente, este parche a\u00f1ade el incremento y decremento de rose_neigh->use cuando rose_neigh->count es incrementado o decrementado.\n\nEste parche tambi\u00e9n modifica rose_rt_free(), rose_rt_device_down() y rose_clear_route() para liberar correctamente las referencias a los objetos rose_neigh antes de liberar un rose_node a trav\u00e9s de rose_remove_node().\n\nEstos cambios aseguran que las estructuras rose_neigh sean liberadas correctamente solo cuando todas las referencias, incluidas las de las estructuras rose_node, sean liberadas. Como resultado, esto resuelve un problema de slab-uso despu\u00e9s de liberaci\u00f3n reportado por Syzbot."}], "id": "CVE-2025-39827", "lastModified": "2026-11-10T13:17:51.570", "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": 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"}]}, "published": "2025-09-16T13:16:02.873", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cce478c3e82a5fc788d72adb2f4c4e983997639"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: rose: include node references in rose_neigh refcount", "id": "2395782", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395782"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39827", "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": "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": "2025-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39827\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39827\nhttps://lore.kernel.org/linux-cve-announce/2025091617-CVE-2025-39827-0c7c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-17T10:04:17.167463+00:00", "updated": "2025-09-17T10:04:17.167497+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}