CVE-2026-23442
NULL Pointer Dereference in Linux Kernel IPv6 SRv6 Path Handling
Publication date: 2026-04-03
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 | 4.10 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | From 4.10.1 (inc) to 6.12.83 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.19.10 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-476 | The product dereferences a pointer that it expects to be valid but is NULL. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's IPv6 implementation, specifically related to SRv6 (Segment Routing over IPv6) paths. The function __in6_dev_get() can return NULL if the device has no IPv6 configuration, such as when the MTU is less than IPV6_MIN_MTU or after the device has been unregistered (NETDEV_UNREGISTER). The vulnerability arises because the code did not check for NULL before using the idev pointer returned by __in6_dev_get() in the functions seg6_hmac_validate_skb() and ipv6_srh_rcv(). This could lead to NULL pointer dereferences.
How can this vulnerability impact me? :
The vulnerability can cause the Linux kernel to dereference a NULL pointer when processing IPv6 SRv6 paths, potentially leading to kernel crashes or denial of service conditions. This could affect system stability and availability.