{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31472", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.098Z", "datePublished": "2026-04-22T13:54:00.281Z", "dateUpdated": "2026-04-22T13:54:00.281Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-22T13:54:00.281Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: validate inner IPv4 header length in IPTFS payload\n\nAdd validation of the inner IPv4 packet tot_len and ihl fields parsed\nfrom decrypted IPTFS payloads in __input_process_payload(). A crafted\nESP packet containing an inner IPv4 header with tot_len=0 causes an\ninfinite loop: iplen=0 leads to capturelen=min(0, remaining)=0, so the\ndata offset never advances and the while(data < tail) loop never\nterminates, spinning forever in softirq context.\n\nReject inner IPv4 packets where tot_len < ihl*4 or ihl*4 < sizeof(struct\niphdr), which catches both the tot_len=0 case and malformed ihl values.\nThe normal IP stack performs this validation in ip_rcv_core(), but IPTFS\nextracts and processes inner packets before they reach that layer."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_iptfs.c"], "versions": [{"version": "6c82d2433671819a550227bf65bfb6043e3d3305", "lessThan": "de6d8e8ce5187f7402c9859b443355e7120c5f09", "status": "affected", "versionType": "git"}, {"version": "6c82d2433671819a550227bf65bfb6043e3d3305", "lessThan": "3db7d4f777a00164582061ccaa99569cd85011a3", "status": "affected", "versionType": "git"}, {"version": "6c82d2433671819a550227bf65bfb6043e3d3305", "lessThan": "0d10393d5eac33cbd92f7a41fddca12c41d3cb7e", "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/xfrm/xfrm_iptfs.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.14", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/de6d8e8ce5187f7402c9859b443355e7120c5f09"}, {"url": "https://git.kernel.org/stable/c/3db7d4f777a00164582061ccaa99569cd85011a3"}, {"url": "https://git.kernel.org/stable/c/0d10393d5eac33cbd92f7a41fddca12c41d3cb7e"}], "title": "xfrm: iptfs: validate inner IPv4 header length in IPTFS payload", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: xfrm: iptfs: validate inner IPv4 header length in IPTFS payload", "id": "2460676", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460676"}, "csaw": false, "cwe": "CWE-606", "details": ["A flaw was found in the Linux kernel, specifically within the xfrm and iptfs components. A remote attacker could exploit this vulnerability by sending a specially crafted Encapsulating Security Payload (ESP) packet. This packet, containing an inner IPv4 header with a total length (tot_len) of zero or malformed Internet Header Length (ihl) values, could trigger an infinite loop in the kernel's processing. This issue results in a Denial of Service (DoS), rendering the affected system unresponsive."], "name": "CVE-2026-31472", "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": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31472\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31472\nhttps://lore.kernel.org/linux-cve-announce/2026042255-CVE-2026-31472-396d@gregkh/T"]}