CVE-2026-46323

skbgroreceive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFLMANAGEDFRAG_REFS flag.

When SKBFLMANAGEDFRAG_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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46323.json",
    "cna_assigner": "Linux"
}

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

753f1ca4e1e50248a1b760c9774d6d6b354562cc

Fixed

1f9c828556416fbe3f49386708ce999fc4d4da06

Fixed

479084ae0e1d9cb7929cb4298d35623de189f80a

Fixed

e334cbf3388fd9334503a778a82d9e9f14dd2f71

Fixed

44bea2032af0425e4ce6d26a8af0ede79db49ec1

Fixed

4db79a322db8c97f7b73b8a347395ef4d685eb40

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46323.json"

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.0.0

Fixed

6.6.142

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.92

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.18.34

Type: ECOSYSTEM
Events: Introduced

6.19.0

Fixed

7.0.11

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46323.json"