{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23098", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.964Z", "datePublished": "2026-02-04T16:08:20.692Z", "dateUpdated": "2026-08-05T12:20:15.261Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:15.261Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: fix double-free in nr_route_frame()\n\nIn nr_route_frame(), old_skb is immediately freed without checking if\nnr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL,\nthe caller function will free old_skb again, causing a double-free bug.\n\nTherefore, to prevent this, we need to modify it to check whether\nnr_neigh->ax25 is NULL before freeing old_skb." } ], "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 - AX.25 is a link-layer protocol reachable via radio links or BPQ Ethernet (same LAN segment). NET/ROM runs on top of AX.25 and while it provides routing across hops, the entry point requires adjacency to the AX.25 network.\nAC:L - The double-free triggers deterministically when ax25_send_frame() returns NULL due to the neighbor device lacking AX.25 configuration. Syzbot reproduced this reliably, and no race condition or special memory layout is required.\nPR:N - No authentication or privilege checks exist on the AX.25 receive path. Any station on the AX.25 network can send frames that are processed through the vulnerable code path without credentials.\nUI:N - The vulnerability triggers during normal packet processing when a NET/ROM routing frame is received. No victim action is required.\nS:U - This is a standard kernel memory corruption bug that does not cross security boundaries like VM or IOMMU isolation.\nC:H - A double-free on sk_buff gives the attacker control over freed heap objects, enabling arbitrary memory read through heap spraying techniques.\nI:H - The double-free enables heap corruption and arbitrary write primitives through slab allocator manipulation, potentially leading to kernel code execution.\nA:H - The double-free causes immediate kernel memory corruption leading to a crash, panic, or oops, providing reliable denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netrom/nr_route.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "25aab6bfc31017a7e52035b99aef5c2b6bde8ffb", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6e0110ea90313b7c0558a0b77038274a6821caf8", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7c48fdf2d1349bb54815b56fb012b9d577707708", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "bd8955337e3764f912f49b360e176d8aaecf7016", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9f5fa78d9980fe75a69835521627ab7943cb3d67", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ba1096c315283ee3292765f6aea4cca15816c4f7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netrom/nr_route.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.249", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.162", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.122", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.68", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.8", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "2.6.12", "versionEndExcluding": "5.10.249" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.122" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/25aab6bfc31017a7e52035b99aef5c2b6bde8ffb" }, { "url": "https://git.kernel.org/stable/c/6e0110ea90313b7c0558a0b77038274a6821caf8" }, { "url": "https://git.kernel.org/stable/c/7c48fdf2d1349bb54815b56fb012b9d577707708" }, { "url": "https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016" }, { "url": "https://git.kernel.org/stable/c/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c" }, { "url": "https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67" }, { "url": "https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7" } ], "title": "netrom: fix double-free in nr_route_frame()", "x_generator": { "engine": "bippy-1.2.0" } } } }