{"cvss":7.8,"datePublished":"2026-06-09T13:16:37.753","dateUpdated":"2026-09-08T09:18:10.030","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don't merge zcopy skbs\n\nskb_gro_receive() can currently copy frags between the source and GRO\nskb, without checking the zerocopy status, and in particular the\nSKBFL_MANAGED_FRAG_REFS flag.\n\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference\non the pages in shinfo->frags. Appending those frags to another skb's\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don't merge the skbs.","id":"CVE-2026-46323","raw":{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/core/gro.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"},{"lessThan":"1f9c828556416fbe3f49386708ce999fc4d4da06","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"},{"lessThan":"479084ae0e1d9cb7929cb4298d35623de189f80a","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"},{"lessThan":"e334cbf3388fd9334503a778a82d9e9f14dd2f71","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"},{"lessThan":"44bea2032af0425e4ce6d26a8af0ede79db49ec1","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"},{"lessThan":"4db79a322db8c97f7b73b8a347395ef4d685eb40","status":"affected","version":"753f1ca4e1e50248a1b760c9774d6d6b354562cc","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/core/gro.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.142","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"affectedData":[{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","packageName":"kernel","product":"Red 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the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don't merge zcopy skbs\n\nskb_gro_receive() can currently copy frags between the source and GRO\nskb, without checking the zerocopy status, and in particular the\nSKBFL_MANAGED_FRAG_REFS flag.\n\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference\non the pages in shinfo->frags. Appending those frags to another skb's\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don't merge the skbs."},{"lang":"es","value":"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: gro: no fusionar skbs zcopy\n\nskb_gro_receive() actualmente puede copiar fragmentos entre el skb de origen y el GRO, sin verificar el estado de zerocopy, y en particular el indicador SKBFL_MANAGED_FRAG_REFS.\n\nCuando SKBFL_MANAGED_FRAG_REFS está establecido, el skb no mantiene una referencia en las páginas en shinfo->frags. Adjuntar esos fragmentos a los fragmentos de otro skb sin corregir el recuento de referencias de la página puede llevar a UAF.\n\nCuando el último skb en la cadena GRO (aquel al que adjuntaríamos fragmentos) o el skb de origen es zerocopy, no fusionar los skbs."}],"id":"CVE-2026-46323","lastModified":"2026-09-08T09:18:10.030","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":1.8,"impactScore":5.9,"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":1.8,"impactScore":5.9,"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary"}]},"published":"2026-06-09T13:16:37.753","references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://access.redhat.com/errata/RHSA-2026:27708"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://access.redhat.com/errata/RHSA-2026:27731"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://access.redhat.com/errata/RHSA-2026:27735"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://access.redhat.com/errata/RHSA-2026:36018"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:44230"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:44231"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:44259"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:44262"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:44270"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:47727"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:62639"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:62640"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:62641"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","url":"https://access.redhat.com/errata/RHSA-2026:62642"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://access.redhat.com/security/cve/CVE-2026-46323"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479832"},{"source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","tags":["Third Party Advisory"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json"}],"sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-416"}],"source":"nvd@nist.gov","type":"Primary"},{"description":[{"lang":"en","value":"CWE-123"}],"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary"}]},"severity":"HIGH","source":"nvd","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don't merge zcopy skbs\n\nskb_gro_receiv..."}