CVE-2026-23098

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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"}}}}

{}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetrom: soluciona doble liberaci\u00f3n en nr_route_frame()\n\nEn nr_route_frame(), old_skb es liberado inmediatamente sin comprobar si el puntero nr_neigh->ax25 es NULL. Por lo tanto, si nr_neigh->ax25 es NULL, la funci\u00f3n llamadora liberar\u00e1 old_skb de nuevo, causando un error de doble liberaci\u00f3n.\n\nPor lo tanto, para evitar esto, necesitamos modificarlo para comprobar si nr_neigh->ax25 es NULL antes de liberar old_skb."}], "id": "CVE-2026-23098", "lastModified": "2026-06-17T10:20:53.157", "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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-02-04T17:16:20.680", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25aab6bfc31017a7e52035b99aef5c2b6bde8ffb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e0110ea90313b7c0558a0b77038274a6821caf8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c48fdf2d1349bb54815b56fb012b9d577707708"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netrom: fix double-free in nr_route_frame()", "id": "2436810", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436810"}, "csaw": false, "details": ["No description is available for this CVE."], "name": "CVE-2026-23098", "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": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23098\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23098\nhttps://lore.kernel.org/linux-cve-announce/2026020427-CVE-2026-23098-1fd2@gregkh/T"]}

{"analysis": {"en": {"generated_at": "2026-04-16T06:58:33.606904+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that includes the netrom patch that guards against double\u2010free in nr_route_frame().", "If the kernel version cannot be updated immediately, disable the netrom protocol or remove its module to eliminate the vulnerable code path.", "If no official patch is available, manually apply the upstream commit that fixes the double\u2010free to your kernel source and rebuild."], "summary": {"action": "Patch", "impact": "Memory Corruption"}, "threat_synthesis": {"affected_systems": "The bug exists in all Linux kernel releases that contain the original implementation of nr_route_frame, from kernel 2.6.12 (including its release candidates) through 6.19 rc6 and earlier. Any system running an unpatched kernel from this range is affected. The issue is specific to the netrom portion of the kernel; disabling that protocol eliminates the risk.", "description_and_impact": "The vulnerability is a double\u2010free flaw in the Linux kernel netrom code, triggered during nr_route_frame(). Old packet data is freed without checking whether the neighbor\u2019s ax25 pointer is NULL, so when the pointer is NULL the caller frees the same buffer again. This double\u2011free can corrupt kernel memory, potentially causing a crash or, in the worst case, allowing an attacker to execute arbitrary code at kernel level. The CVE description itself states only that memory corruption can result; the possibility of remote code execution is inferred, not explicitly asserted.", "risk_and_exploitability": "The CVSS score of 8.8 indicates high severity, while the EPSS value of less than 1% suggests exploitation is unlikely at present but not impossible. The flaw is not listed in the CISA KEV catalog. Based on the description, the likely attack vector requires an attacker to send malformed or specially crafted netrom network packets to the target system, or to have local privileges that can trigger the double\u2011free. Thus, remote or local compromise of the netrom stack is inferred as the primary path for exploitation."}}}}, "created": "2026-04-16T07:00:11.001069+00:00", "updated": "2026-04-16T07:00:11.001083+00:00", "vendors": []}