---
id: CVE-2026-31501
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path

  cppi5_hdesc_get_psdata() returns a pointer into the CPPI descriptor.
  In both emac_rx_packet() a…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path

  cppi5_hdesc_get_psdata() returns a pointer into the CPPI descriptor.
  In both emac_rx_packet() a…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.15.1, < 6.19.11'
  - linux_kernel = 6.15
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.11
published: '2026-04-22'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:28.990'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-31501'
references:
  - url: 'https://git.kernel.org/stable/c/c516c2e06fe580b8d38de60cd407072a5de81506'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d5827316debcb677679bb014885d7be92c410e11'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb8c426c9803beb171f89d15fea17505eb517714'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0038
epssPercentile: 0.30253
ingestedAt: '2026-10-15T11:00:41.714Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path

cppi5_hdesc_get_psdata() returns a pointer into the CPPI descriptor.
In both emac_rx_packet() and emac_rx_packet_zc(), the descriptor is
freed via k3_cppi_desc_pool_free() before the psdata pointer is used
by emac_rx_timestamp(), which dereferences psdata[0] and psdata[1].
This constitutes a use-after-free on every received packet that goes
through the timestamp path.

Defer the descriptor free until after all accesses through the psdata
pointer are complete. For emac_rx_packet(), move the free into the
requeue label so both early-exit and success paths free the descriptor
after all accesses are done. For emac_rx_packet_zc(), move the free to
the end of the loop body after emac_dispatch_skb_zc() (which calls
emac_rx_timestamp()) has returned.

## Affected

- `linux_kernel >= 6.15.1, < 6.19.11`
- `linux_kernel = 6.15`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.11`