{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53070", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.382Z", "datePublished": "2026-06-24T16:30:11.816Z", "dateUpdated": "2026-06-24T16:30:11.816Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:30:11.816Z"}, "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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/ipv6.c", "net/sctp/protocol.c"], "versions": [{"version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "lessThan": "790093245e35040c2adb15f48970020425aa3f47", "status": "affected", "versionType": "git"}, {"version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "lessThan": "2cd7e6971fc2787408ceef17906ea152791448cf", "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/sctp/ipv6.c", "net/sctp/protocol.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.11", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/790093245e35040c2adb15f48970020425aa3f47"}, {"url": "https://git.kernel.org/stable/c/2cd7e6971fc2787408ceef17906ea152791448cf"}], "title": "sctp: disable BH before calling udp_tunnel_xmit_skb()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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