CVE-2026-52981

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But even the first added user of neigh_xmit (mpls) relied on\nneigh_xmit to release the skb (or queue it for tx).\n\nsashiko reported:\n If neigh_xmit() is called with an uninitialized neighbor table (for\n example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT\n and bypasses its internal out_kfree_skb error path. Because the return\n value of neigh_xmit() is ignored here, does this leak the SKB?\n\nAssume full ownership and remove the last code path that doesn't\nxmit or free skb."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - An unauthenticated packet sender can trigger the vulnerable `neigh_xmit()` path through configured network forwarding paths such as nftables netdev forwarding or MPLS forwarding. In the highest reasonable deployment, this is an exposed router/firewall datapath reachable by network traffic.\nAC:L - The bug is deterministic once the forwarding path uses a real neighbor table whose pointer is NULL, such as `NEIGH_ND_TABLE` when IPv6 neighbor discovery is unavailable. No race or heap shaping is required; repeated matching packets repeatedly leak skbs.\nPR:N - The attacker does not need privileges to send packets into an already configured vulnerable forwarding datapath. Although installing such rules/routes requires administrative network privileges, the packet-triggering attack itself is unauthenticated.\nUI:N - No victim user action is required after the affected forwarding configuration exists. The attacker only sends traffic that reaches the vulnerable path.\nS:U - The impact remains within the kernel/networking security authority of the affected system. There is no VM escape, sandbox boundary crossing, or separate security scope involved.\nC:N - The flaw is an skb memory leak caused by failing to free the packet buffer on the missing-table error path. It does not expose leaked memory contents to the attacker.\nI:N - The bug does not provide a memory corruption or data modification primitive. It only loses ownership of allocated skbs.\nA:H - An attacker can repeatedly trigger the leak with packets, consuming kernel memory and plausibly causing OOM, hangs, packet processing failure, or system-wide denial of service. 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But even the first added user of neigh_xmit (mpls) relied on\nneigh_xmit to release the skb (or queue it for tx).\n\nsashiko reported:\n If neigh_xmit() is called with an uninitialized neighbor table (for\n example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT\n and bypasses its internal out_kfree_skb error path. Because the return\n value of neigh_xmit() is ignored here, does this leak the SKB?\n\nAssume full ownership and remove the last code path that doesn't\nxmit or free skb."}], "id": "CVE-2026-52981", "lastModified": "2026-10-19T20:18:52.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52981", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:23:55.989578Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:08.723", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: neigh: let neigh_xmit take skb ownership", "id": "2492421", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492421"}, "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-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nneigh: let neigh_xmit take skb ownership\nneigh_xmit always releases the skb, except when no neighbour table is\nfound. But even the first added user of neigh_xmit (mpls) relied on\nneigh_xmit to release the skb (or queue it for tx).\nsashiko reported:\nIf neigh_xmit() is called with an uninitialized neighbor table (for\nexample, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT\nand bypasses its internal out_kfree_skb error path. Because the return\nvalue of neigh_xmit() is ignored here, does this leak the SKB?\nAssume full ownership and remove the last code path that doesn't\nxmit or free skb.", "A flaw was found in the Linux kernel. The `neigh_xmit` function, when called with an uninitialized neighbor table (such as `NEIGH_ND_TABLE` when IPv6 is disabled), can return an error without properly releasing the allocated `skb` (socket buffer). This can lead to a memory leak, potentially impacting system stability and resource availability."], "name": "CVE-2026-52981", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52981\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52981\nhttps://lore.kernel.org/linux-cve-announce/2026062441-CVE-2026-52981-dce5@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,8a89054a1ec0767aec25ed2bbac933da6ba3cf5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,9247d59ca15bf60a57dca08103f055d8a4340877)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,0084712e0bee204b284510cdb63182fd5a30c2b7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,63063ba60d2dc334e34f1e3f9271d7f3f6f30307)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,445e45a2c3a078316a62d2d331a570cf34ef5079)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62,4438113be604ee67a7bf4f81da6e1cca41332ce4)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-24T18:45:05.695384+00:00", "updated": "2026-08-12T06:00:11.041799+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-401", "CWE-772"]}