{"api_version":"1","generated_at":"2026-11-11T01:30:13+00:00","cve":"CVE-2026-99284","urls":{"html":"https://cve.report/CVE-2026-99284","api":"https://cve.report/api/cve/CVE-2026-99284.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99284","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99284"},"summary":{"title":"net: skbuff: propagate shared-frag marker in skb_zerocopy()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-11-07 21:17:00","updated_at":"2026-11-10 19:22:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3","name":"https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773","name":"https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0","name":"https://git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe","name":"https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab","name":"https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99284","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99284","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af2806f8f90a150160be898cd85332459c83c5cb fe8477e23dd2ee6bce231d65f2586a333b211dc0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af2806f8f90a150160be898cd85332459c83c5cb 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af2806f8f90a150160be898cd85332459c83c5cb d7d6ff98d5d1b400f02211f962ac32cc0020aeab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af2806f8f90a150160be898cd85332459c83c5cb 1a9c180cd8435917b7516edfb1c9148032c28773 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af2806f8f90a150160be898cd85332459c83c5cb 79dc34beb1fdb3da79753e51e15c68591a2561fe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.117 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.61 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.15 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3.2 7.3.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.4-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99284","cve":"CVE-2026-99284","epss":"0.002090000","percentile":"0.111590000","score_date":"2026-11-10","updated_at":"2026-11-11 00:08:19"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/core/skbuff.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"fe8477e23dd2ee6bce231d65f2586a333b211dc0","status":"affected","version":"af2806f8f90a150160be898cd85332459c83c5cb","versionType":"git"},{"lessThan":"1c623e3cbf43f12dd4a72712079bfa247a9b8ba3","status":"affected","version":"af2806f8f90a150160be898cd85332459c83c5cb","versionType":"git"},{"lessThan":"d7d6ff98d5d1b400f02211f962ac32cc0020aeab","status":"affected","version":"af2806f8f90a150160be898cd85332459c83c5cb","versionType":"git"},{"lessThan":"1a9c180cd8435917b7516edfb1c9148032c28773","status":"affected","version":"af2806f8f90a150160be898cd85332459c83c5cb","versionType":"git"},{"lessThan":"79dc34beb1fdb3da79753e51e15c68591a2561fe","status":"affected","version":"af2806f8f90a150160be898cd85332459c83c5cb","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/core/skbuff.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.14"},{"lessThan":"3.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.117","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.61","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.15","versionType":"semver"},{"lessThanOrEqual":"7.3.*","status":"unaffected","version":"7.3.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.4-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.117","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.61","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.15","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3.2","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.4-rc1","versionStartIncluding":"3.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-11-10T18:15:30.724Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0"},{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99284","datePublished":"2026-11-07T20:40:33.661Z","dateReserved":"2026-09-25T10:25:14.405Z","dateUpdated":"2026-11-10T18:15:30.724Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-07 21:17:00","lastModifiedDate":"2026-11-10 19:22:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99284","Ordinal":"1","Title":"net: skbuff: propagate shared-frag marker in skb_zerocopy()","CVE":"CVE-2026-99284","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99284","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net: skbuff: propagate shared-frag marker in skb_zerocopy()"}]}}}