CVE-2026-23001
BaseFortify
Publication date: 2026-01-25
Last updated on: 2026-04-27
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | From 6.13 (inc) to 6.18.7 (exc) |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | From 5.11 (inc) to 5.15.199 (exc) |
| linux | linux_kernel | From 5.16 (inc) to 6.1.162 (exc) |
| linux | linux_kernel | From 6.2 (inc) to 6.6.122 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.67 (exc) |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 6.19 |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | From 3.18.1 (inc) to 5.10.249 (exc) |
Helpful Resources
Exploitability
| 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a use-after-free (UAF) issue in the Linux kernel's macvlan component, specifically in the macvlan_forward_source() function. It occurs because the vlan pointer in the macvlan_source_entry structure is not properly cleared before the RCU (Read-Copy-Update) grace period starts when macvlan_hash_del_source() is called. This can cause macvlan_forward_source() to access entries that are queued for freeing, potentially leading to undefined behavior or crashes. The fix involves adding RCU protection to the vlan pointer to prevent this issue.
How can this vulnerability impact me? :
This vulnerability can lead to use-after-free conditions in the Linux kernel's macvlan networking code, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service by exploiting the improper handling of freed memory.