CVE-2026-46323
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-123
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06Patch
- https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dPatch
- https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1Patch
- https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80aPatch
- https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40Patch
- https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71Patch
- https://access.redhat.com/errata/RHSA-2026:27708Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27731Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27735Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36018Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:44230
- https://access.redhat.com/errata/RHSA-2026:44231
- https://access.redhat.com/errata/RHSA-2026:44259
- https://access.redhat.com/errata/RHSA-2026:44262
- https://access.redhat.com/errata/RHSA-2026:44270
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/errata/RHSA-2026:62639
- https://access.redhat.com/errata/RHSA-2026:62640
- https://access.redhat.com/errata/RHSA-2026:62641
- https://access.redhat.com/errata/RHSA-2026:62642
- https://access.redhat.com/security/cve/CVE-2026-46323Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2479832Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.jsonThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.