{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53228", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.393Z", "datePublished": "2026-06-25T08:39:27.893Z", "dateUpdated": "2026-08-05T12:34:20.273Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:20.273Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sit: reload inner IPv6 header after GSO offloads\n\nipip6_tunnel_xmit() caches the inner IPv6 header pointer at function\nentry and continues using it after iptunnel_handle_offloads().\n\nFor GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone().\nWhen the skb header is cloned, skb_header_unclone() can call\npskb_expand_head(), which may move the skb head. The pskb_expand_head()\ncontract requires pointers into the skb header to be reloaded after the\ncall.\n\nIf the later skb_realloc_headroom() branch is not taken, SIT uses the\nstale iph6 pointer to read the inner hop limit and DS field. That can\nread from a freed skb head after the old head's remaining clone is\nreleased.\n\nReload iph6 after the offload helper succeeds and before subsequent\nreads from the inner IPv6 header. Keep the existing reload after\nskb_realloc_headroom(), since that branch can also replace the skb." } ], "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 - The vulnerable SIT transmit path can be reached by network-triggered IPv6 traffic in a reasonable deployment where a public service or router sends large TCP/GSO packets through a configured SIT tunnel.\nAC:L - There is no race or fragile timing requirement; GSO and header-cloned TCP skbs are normal for large TCP transmissions, and the attacker can repeatedly trigger them with network traffic.\nPR:N - In the network-triggered scenario, the attacker does not need local privileges or authentication; the required SIT configuration is an environmental precondition on the victim.\nUI:N - No victim user action is required beyond the system processing network traffic through the configured SIT tunnel.\nS:U - The impact remains within the kernel and its networking security authority, with no VM, IOMMU, or separate security-scope boundary crossed.\nC:H - The stale inner IPv6 header pointer can read from freed skb head memory after `skb_header_unclone()`/`pskb_expand_head()`, making this a kernel use-after-free read. Per kernel CVSS guidance, use-after-free conditions are scored with high confidentiality impact.\nI:H - Although the immediate stale access feeds header fields, it is a kernel use-after-free in attacker-triggerable networking memory, and kernel UAFs are treated as potentially exploitable for heap manipulation and integrity compromise.\nA:H - Use-after-free in the kernel networking transmit path can lead to oops, panic, or repeated crash conditions, especially under memory debugging or unfavorable heap reuse." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/sit.c" ], "versions": [ { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "fddd41445a0537b093e6b3f6232c9933cad1e48b", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "1132e5edc2866c3530be17622153a597095f0e43", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "9c67b44edb3598d234efae6e44649eb993c03da5", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "59f80c919713250fe5d25a4d9aea4e49580fa1d4", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "2fa49b2715e1bad12ce3b0fa64e234d9582c8193", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c", "status": "affected", "versionType": "git" }, { "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab", "lessThan": "f0e42f0c4337b1f220de1ddd63f47197c7dee4de", "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/ipv6/sit.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "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": "3.18", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b" }, { "url": "https://git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43" }, { "url": "https://git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5" }, { "url": "https://git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0" }, { "url": "https://git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4" }, { "url": "https://git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193" }, { "url": "https://git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c" }, { "url": "https://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de" } ], "title": "ipv6: sit: reload inner IPv6 header after GSO offloads", "x_generator": { "engine": "bippy-1.2.0" } } } }