{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46300", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.111Z", "datePublished": "2026-05-23T11:44:02.231Z", "dateUpdated": "2026-09-01T12:04:48.173Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:05.381Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to. If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers. In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data(). If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags. The tailroom copy path does not need the marker because it copies\nbytes into @to's linear data rather than transferring frag descriptors." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The corruptible shared-frag condition only arises from local page splicing (sendfile/vmsplice/MSG_SPLICE_PAGES); NIC-received packets never carry SKBFL_SHARED_FRAG, and the skb must reach ESP input via loopback/local SA, so a local account is required.\nAC:L - The attacker controls the spliced file pages, the ESP key and payload, and the packet sizes/timing that drive coalescing on loopback, making the marker loss and in-place decrypt reliably reproducible.\nPR:L - An unprivileged user can splice readable file pages and obtain CAP_NET_ADMIN to install xfrm SAs/policies inside a user+network namespace (unshare -Urn); the global page cache is still corrupted from there.\nUI:N - The attacker performs the splice, IPsec setup, and packet delivery entirely on its own; no victim action is needed to trigger the in-place decrypt over shared frags.\nS:U - The corruption stays within the kernel's memory authority as a standard local memory-corruption/privilege-escalation primitive, with no crossing of a VM/IOMMU boundary.\nC:H - The write primitive into page-cache memory (e.g., overwriting a shared library's cached code) can be leveraged into code execution and arbitrary memory disclosure.\nI:H - ESP decrypts attacker-controlled plaintext in place over page-cache-backed pages, yielding an arbitrary write of chosen content into globally-shared file/code memory.\nA:H - Overwriting page-cache pages backing files or executable code corrupts shared kernel state and readily causes oopses, crashes, and system instability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/skbuff.c" ], "versions": [ { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "3599e6b3cc1ada96883d496a50a210d3afbb6987", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "9d3e5fd19fe1063bf607219e8562fbd567b8e8d5", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "78bf6b6bb19541d19fbda6242e7cfe2c682763c0", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "3bd9e113d50034db99d7ef69fd8e5242d15e414a", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "3884358a9286b17f389a72b1426fc4547c23c111", "status": "affected", "versionType": "git" }, { "version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9", "lessThan": "f84eca5817390257cef78013d0112481c503b4a3", "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/core/skbuff.c" ], "versions": [ { "version": "3.9", "status": "affected" }, { "version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.257", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.208", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.174", "lessThanOrEqual": 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"https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c" }, { "url": "https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5" }, { "url": "https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0" }, { "url": "https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e" }, { "url": "https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a" }, { "url": "https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111" }, { "url": "https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3" } ], "title": "net: skbuff: preserve shared-frag marker during coalescing", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "http://www.openwall.com/lists/oss-security/2026/05/13/5" }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/21/11" }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/21/12" }, { "url": 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