{"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"}}}}