CVE-2026-53363

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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\u2019s 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"}}}}

{}

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{"bugzilla": {"description": "kernel: xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()", "id": "2498986", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498986"}, "csaw": false, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel's `iptfs` component, part of the IPSec framework. The `iptfs_consume_frags()` function does not correctly propagate a flag indicating shared fragments. This can cause the Encapsulating Security Payload (ESP) to make incorrect security decisions regarding in-place encryption, potentially impacting the integrity or confidentiality of network traffic."], "name": "CVE-2026-53363", "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": "2026-07-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53363\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53363\nhttps://lore.kernel.org/linux-cve-announce/2026071032-CVE-2026-53363-b97c@gregkh/T"]}

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