{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53363", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.400Z", "datePublished": "2026-07-10T11:55:31.820Z", "dateUpdated": "2026-08-05T12:35:13.152Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:35:13.152Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()\n\niptfs_consume_frags() transfers paged fragments from one socket buffer\nto another but fails to propagate the SKBFL_SHARED_FRAG flag. This is\nthe same class of bug that was fixed in skb_try_coalesce() for\nCVE-2026-46300: when fragments backed by read-only page-cache pages are\nmerged, the marker indicating their shared nature must be preserved so\nthat ESP can decide correctly whether in-place encryption is safe.\n\nApply the same two-line fix used in skb_try_coalesce() to\niptfs_consume_frags()." } ], "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 - An unauthenticated remote peer can trigger the vulnerable outbound IP-TFS ESP aggregation path by causing a network service to send file-backed splice/sendfile data through an already configured IP-TFS tunnel. A local user namespace setup is also possible, but Network is the higher defensible vector.\nAC:L - No race or uncontrollable timing is required; the attacker can shape request sizes and traffic volume so shared-frag skbs are aggregated before ESP processing. The required IP-TFS configuration is the vulnerable operating mode, not an exploitation complexity barrier.\nPR:N - The remote-service scenario requires no attacker privileges once the target already uses IP-TFS/IPsec for that traffic. Although creating XFRM state requires CAP_NET_ADMIN, that gate is not crossed by the remote attacker and is also namespace-reachable for local reproduction.\nUI:N - No human action is needed after the affected tunnel/service is running. Packets and service responses drive the vulnerable path automatically.\nS:U - The corruption occurs within the same kernel/system security authority and does not cross a VM, IOMMU, or separate sandbox boundary. Standard kernel or page-cache compromise remains Scope Unchanged.\nC:H - The lost marker permits ESP crypto to operate on externally owned/page-cache-backed fragments as if privately owned, creating cross-object memory corruption in kernel-managed cache pages. Under the required higher-severity assumption, that corruption can support sensitive data exposure or further exploitation.\nI:H - Similar shared-frag fixes explicitly describe writes into the page cache of root-owned read-only files; this bug preserves that class of externally backed page corruption through IP-TFS aggregation. That is a high-integrity impact because attacker-influenced crypto output can modify data outside the skb’s ownership.\nA:H - Corrupting page-cache-backed executable, library, or service data can crash or destabilize privileged processes and repeatedly disrupt the affected system. Kernel-managed memory corruption is therefore a high availability impact." } ] } ], "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": "b96ba312e21c9b7ac1526829b9640ddc06695c0b", "lessThan": "dd66f7f6e360ee82cd905517726f8e9091265de5", "status": "affected", "versionType": "git" }, { "version": "b96ba312e21c9b7ac1526829b9640ddc06695c0b", "lessThan": "c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c", "status": "affected", "versionType": "git" }, { "version": "b96ba312e21c9b7ac1526829b9640ddc06695c0b", "lessThan": "e9096a5a170e7ecd6467bc2e08668ec39897cda7", "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": "6.18.36", "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": "6.14", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/dd66f7f6e360ee82cd905517726f8e9091265de5" }, { "url": "https://git.kernel.org/stable/c/c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c" }, { "url": "https://git.kernel.org/stable/c/e9096a5a170e7ecd6467bc2e08668ec39897cda7" } ], "title": "xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()", "x_generator": { "engine": "bippy-1.2.0" } } } }