CVE-2026-53070

{"id": "CVE-2026-53070", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "lessThan": "0de7db2eb27e82b983157016fa604b1ba664ae5f", "versionType": "git"}, {"status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "lessThan": "790093245e35040c2adb15f48970020425aa3f47", "versionType": "git"}, {"status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "lessThan": "2cd7e6971fc2787408ceef17906ea152791448cf", "versionType": "git"}], "programFiles": ["net/sctp/ipv6.c", "net/sctp/protocol.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"status": "unaffected", "version": "0", "lessThan": "5.11", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.37", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sctp/ipv6.c", "net/sctp/protocol.c"], "defaultStatus": "affected"}]}], "published": "2026-06-24T17:17:20.513", "references": [{"url": "https://git.kernel.org/stable/c/0de7db2eb27e82b983157016fa604b1ba664ae5f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2cd7e6971fc2787408ceef17906ea152791448cf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/790093245e35040c2adb15f48970020425aa3f47", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: disable BH before calling udp_tunnel_xmit_skb()\n\nudp_tunnel_xmit_skb() / udp_tunnel6_xmit_skb() are expected to run with\nBH disabled. After commit 6f1a9140ecda (\"add xmit recursion limit to\ntunnel xmit functions\"), on the path:\n\n udp(6)_tunnel_xmit_skb() -> ip(6)tunnel_xmit()\n\ndev_xmit_recursion_inc()/dec() must stay balanced on the same CPU.\n\nWithout local_bh_disable(), the context may move between CPUs, which can\nbreak the inc/dec pairing. This may lead to incorrect recursion level\ndetection and cause packets to be dropped in ip(6)_tunnel_xmit() or\n__dev_queue_xmit().\n\nFix it by disabling BH around both IPv4 and IPv6 SCTP UDP xmit paths.\n\nIn my testing, after enabling the SCTP over UDP:\n\n # ip net exec ha sysctl -w net.sctp.udp_port=9899\n # ip net exec ha sysctl -w net.sctp.encap_port=9899\n # ip net exec hb sysctl -w net.sctp.udp_port=9899\n # ip net exec hb sysctl -w net.sctp.encap_port=9899\n\n # ip net exec ha iperf3 -s\n\n- without this patch:\n\n # ip net exec hb iperf3 -c 192.168.0.1 --sctp\n [ 5] 0.00-10.00 sec 37.2 MBytes 31.2 Mbits/sec sender\n [ 5] 0.00-10.00 sec 37.1 MBytes 31.1 Mbits/sec receiver\n\n- with this patch:\n\n # ip net exec hb iperf3 -c 192.168.0.1 --sctp\n [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec sender\n [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec receiver"}], "lastModified": "2026-06-28T08:16:32.403", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}