CVE-2026-31644

HIGH EPSS 2.6%
Published Apr 24, 20262mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: fix use-after-free and leak in lan966x_fdma_reload() When lan966x_fdma_reload() fails to allocate new RX buffers, the restore path restarts DMA using old descriptors whose pages were already freed via lan966x_fdma_rx_free_pages(). Since page_pool_put_full_page() can release pages back to the buddy allocator, the hardware may DMA into memory now owned by other kernel subsystems. Additionally, on the restore path, the newly created page pool (if allocation partially succeeded) is overwritten without being destroyed, leaking it. Fix both issues by deferring the release of old pages until after the new allocation succeeds. Save the old page array before the allocation so old pages can be freed on the success path. On the failure path, the old descriptors, pages and page pool are all still valid, making the restore safe. Also ensure the restore path re-enables NAPI and wakes the netdev, matching the success path.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥6.12.1  –  <6.12.82
linuxlinux_kernel*≥6.13  –  <6.18.23
linuxlinux_kernel*≥6.19  –  <6.19.13
linuxlinux_kernel6.12any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/59c3d55a946cacdb4181600723c20ac4f4c20c84
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/691082c0b93c13a5e068c0905f673060bddc204e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92a673019943770930e2a8bfd52e1aad47a1fc1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9950e9199b3dfdfbde0b8d96ba947d7b11243801
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/59c3d55a946cacdb4181600723c20ac4f4c20c84
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/691082c0b93c13a5e068c0905f673060bddc204e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92a673019943770930e2a8bfd52e1aad47a1fc1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9950e9199b3dfdfbde0b8d96ba947d7b11243801
    Patch