--- id: CVE-2026-46323 title: |- In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the… summary: |- In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-416 - CWE-123 vendor: linux product: linux_kernel affected: - 'linux_kernel >= 6.0, < 6.1.176' - 'linux_kernel >= 6.2, < 6.6.142' - 'linux_kernel >= 6.7, < 6.12.92' - 'linux_kernel >= 6.13, < 6.18.34' - 'linux_kernel >= 6.19, < 7.0.11' - linux_kernel = 7.1 patched: - linux_kernel 7.0.11 published: '2026-06-09' updated: '2026-09-08' sourceUpdated: '2026-09-08T09:18:10.030' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46323' references: - url: 'https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://access.redhat.com/errata/RHSA-2026:27708' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:27731' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:27735' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36018' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44230' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44231' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44259' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44262' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44270' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:47727' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:62639' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:62640' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:62641' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:62642' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-46323' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2479832' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-46323' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46323' - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f9c828556416fbe3f49386708ce999fc4d4da06 - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=44bea2032af0425e4ce6d26a8af0ede79db49ec1 - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=479084ae0e1d9cb7929cb4298d35623de189f80a - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4db79a322db8c97f7b73b8a347395ef4d685eb40 - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e334cbf3388fd9334503a778a82d9e9f14dd2f71 - url: >- https://lore.kernel.org/netdev/4d583fc5401298453d0a2f1b4719a15be30c8e49.1779194090.git.sd@queasysnail.net/ - url: 'https://lore.kernel.org/netdev/agVpIsaSherjHTYg@sultan-box/' - url: 'https://access.redhat.com/errata/RHSA-2026:67935' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.00202 epssPercentile: 0.09002 ingestedAt: '2026-07-07T12:52:59.626Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs. ## Affected - `linux_kernel >= 6.0, < 6.1.176` - `linux_kernel >= 6.2, < 6.6.142` - `linux_kernel >= 6.7, < 6.12.92` - `linux_kernel >= 6.13, < 6.18.34` - `linux_kernel >= 6.19, < 7.0.11` - `linux_kernel = 7.1` ## Remediation Upgrade past the affected range: - `linux_kernel 7.0.11` ## Vendor advisories - **RHSA-2026:67935** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:67935) - **RHSA-2026:47727** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:47727) - **RHSA-2026:44230** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:44230) - **RHSA-2026:44231** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:44231) - **RHSA-2026:44259** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:44259) - **RHSA-2026:44262** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:44262) - **RHSA-2026:27731** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27731) - **RHSA-2026:44270** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:44270) - **RHSA-2026:27735** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27735) - **RHSA-2026:27708** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6) · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27708) - **RHSA-2026:36018** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:36018) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json)