{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43037", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.978Z", "datePublished": "2026-05-01T14:15:35.314Z", "dateUpdated": "2026-08-12T12:04:46.644Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:27.160Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2->cb[] in ip4ip6_err()\n\nOskar Kjos reported the following problem.\n\nip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written\nby the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes\nIPCB(skb2) to __ip_options_echo(), which interprets that cb[] region\nas struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff\nat offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr\nvalue. __ip_options_echo() then reads optlen from attacker-controlled\npacket data at sptr[rr+1] and copies that many bytes into dopt->__data,\na fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).\n\nTo fix this we clear skb2->cb[], as suggested by Oskar Kjos.\n\nAlso add minimal IPv4 header validation (version == 4, ihl >= 5)."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - A remote IPv6 peer can send a crafted ICMPv6 error packet to an IPv6 tunnel endpoint and reach `icmpv6_rcv()` -> `icmpv6_notify()` -> `tunnel46_err()` -> `ip4ip6_err()` without local execution. The vulnerable code processes network packet contents in the kernel network stack.\nAC:L - Triggering is deterministic once an IPv4-over-IPv6 tunnel endpoint exists: the attacker controls the ICMPv6 error, IPv6 extension-header-derived control block state, and quoted inner IPv4 bytes used by `__ip_options_echo()`. There is no race or hard-to-influence condition.\nPR:N - The exploit packet is unauthenticated network input and does not require the attacker to have an account or capabilities on the target. Tunnel configuration requires administration, but exploitation of an already deployed tunnel endpoint does not.\nUI:N - No victim user action is required; receipt and processing of the crafted ICMPv6 packet is enough. The path is normal kernel packet handling.\nS:U - The corruption occurs inside the kernel network stack and impacts the same kernel security authority. This is not a VM escape or cross-scope boundary bypass.\nC:H - The bug is an attacker-controlled kernel stack buffer overflow in `__ip_options_echo()` via a bogus IPv4 option length copied into a fixed 40-byte buffer. Kernel memory corruption of this kind can plausibly be leveraged for high-impact information disclosure.\nI:H - The overflow copies attacker-controlled packet data onto the kernel stack and can plausibly corrupt control data or adjacent state. Under the required higher-severity rule, this supports high integrity impact.\nA:H - Even without full code execution, the kernel stack overflow can trigger an oops, panic, or other fatal corruption. The crafted packet can be sent remotely and repeatedly against a vulnerable tunnel endpoint."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_tunnel.c"], "versions": [{"version": "c4d3efafcc933fd2ffd169d7dc4f980393a13796", "lessThan": "ea9f65b27c8404e164848ebff1443310fd187629", "status": "affected", "versionType": "git"}, {"version": "c4d3efafcc933fd2ffd169d7dc4f980393a13796", "lessThan": "d6621f60192fe10c047a4487be42a6f4c150707f", "status": "affected", "versionType": "git"}, {"version": "c4d3efafcc933fd2ffd169d7dc4f980393a13796", "lessThan": "2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5", "status": "affected", "versionType": "git"}, {"version": "c4d3efafcc933fd2ffd169d7dc4f980393a13796", "lessThan": "a0c4ce9900a108eaf55d0f3b399cb55999647d39", "status": "affected", "versionType": "git"}, {"version": "c4d3efafcc933fd2ffd169d7dc4f980393a13796", 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"product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}], "datePublic": "2026-05-01T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel's IPv4-over-IPv6 tunnel error handling code. 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{"lang": "en", "value": "RHSA-2026:25217: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)"}, {"lang": "en", "value": "RHSA-2026:28742: Red Hat Enterprise Linux BaseOS (v. 10)"}, {"lang": "en", "value": "RHSA-2026:25121: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)"}, {"lang": "en", "value": "RHSA-2026:28749: Red Hat Enterprise Linux BaseOS (v. 8)"}, {"lang": "en", "value": "RHSA-2026:26535: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)"}, {"lang": "en", "value": "RHSA-2026:25533: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)"}, {"lang": "en", "value": "RHSA-2026:22964: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)"}, {"lang": "en", "value": "RHSA-2026:28748: Red Hat Enterprise Linux BaseOS E4S (v.8.8)"}, {"lang": "en", "value": "RHSA-2026:28750: Red Hat Enterprise Linux BaseOS E4S (v.9.2)"}, {"lang": "en", "value": "RHSA-2026:28738: Red Hat Enterprise Linux BaseOS E4S (v.9.4)"}, {"lang": "en", "value": "RHSA-2026:28740: Red Hat Enterprise Linux BaseOS EUS (v.9.6)"}, {"lang": "en", "value": "RHSA-2026:28741: Red Hat Enterprise Linux BaseOS (v. 9)"}, {"lang": "en", "value": "RHSA-2026:25120: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"}, {"lang": "en", "value": "RHSA-2026:22900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"}], "timeline": [{"lang": "en", "time": "2026-05-01T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-05-01T00:00:00.000Z", "value": "Made public."}], "title": "kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()", "workarounds": [{"lang": "en", "value": "Mitigation for this issue is to skip loading the affected module `ip6_tunnel` onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time.\n~~~\nHow do I blacklist a kernel module to prevent it from loading automatically? \nhttps://access.redhat.com/solutions/41278 \n~~~\n\nWe may also want to detection and monitoring an affected system as below:\n~~~\nMonitor for exploitation attempts:\n\n# Enable kernel audit for IPv6 tunnel operations\nauditctl -a always,exit -F arch=b64 -S socket -F a0=10 -F a1=3 -k ipv6_tunnel\n\n# Monitor system logs for kernel panics/crashes\njournalctl -k -p err -f | grep -i \"ip6_tunnel\\|icmp\\|stack\"\n~~~"}], "x_adpType": "supplier", "x_generator": {"engine": "sadp-cli 1.0.0"}, "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-12T12:04:46.644Z"}}]}}

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{"bugzilla": {"description": "kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()", "id": "2464351", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464351"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-43037", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43037\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43037\nhttps://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43037-0346@gregkh/T"], "threat_severity": "Important"}

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