{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99284", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.405Z", "datePublished": "2026-11-07T20:40:33.661Z", "dateUpdated": "2026-11-07T20:40:33.661Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-07T20:40:33.661Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker in skb_zerocopy()\n\nskb_zerocopy() moves frag descriptors from @from into @to and takes a\nreference on each frag, but it does not copy skb_shinfo(from)->flags into\nskb_shinfo(to)->flags.  A destination skb holding the same page-cache\nbacked frags as the source therefore reports skb_has_shared_frag() as\nfalse.\n\nThat breaks the invariant relied on by later in-place writers.  ESP input\nchecks skb_has_shared_frag() before deciding whether an uncloned\nnonlinear skb can skip skb_cow_data(); with the marker lost, an skb that\nskb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is\ndecrypted in place, letting an unprivileged user write into the page\ncache of a root-owned read-only file.\n\nPropagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for\nthe other frag-transfer helpers."}], "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": "af2806f8f90a150160be898cd85332459c83c5cb", "lessThan": "1c623e3cbf43f12dd4a72712079bfa247a9b8ba3", "status": "affected", "versionType": "git"}, {"version": "af2806f8f90a150160be898cd85332459c83c5cb", "lessThan": "d7d6ff98d5d1b400f02211f962ac32cc0020aeab", "status": "affected", "versionType": "git"}, {"version": "af2806f8f90a150160be898cd85332459c83c5cb", "lessThan": "1a9c180cd8435917b7516edfb1c9148032c28773", "status": "affected", "versionType": "git"}, {"version": "af2806f8f90a150160be898cd85332459c83c5cb", "lessThan": "79dc34beb1fdb3da79753e51e15c68591a2561fe", "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": "3.14", "status": "affected"}, {"version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.61", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.15", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3.2", "lessThanOrEqual": "7.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.4-rc1", "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": "3.14", "versionEndExcluding": "6.18.61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.3.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.4-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3"}, {"url": "https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab"}, {"url": "https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773"}, {"url": "https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe"}], "title": "net: skbuff: propagate shared-frag marker in skb_zerocopy()", "x_generator": {"engine": "bippy-1.2.0"}}}}