CVE-2026-46323
Analyzed
Analyzed - Analysis Complete
Linux Kernel GRO Zerocopy Use-After-Free
Vulnerability report for CVE-2026-46323, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-06-09
Last updated on: 2026-07-15
Assigner: kernel.org
Description
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 Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | From 6.7 (inc) to 6.12.92 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.34 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 7.0.11 (exc) |
| linux | linux_kernel | From 6.2 (inc) to 6.6.142 (exc) |
| linux | linux_kernel | From 6.0 (inc) to 6.1.176 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
| CWE-123 | Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow. |
