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🛡️ CVE-2026-23460 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect

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

net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect

syzkaller reported a bug [1], and the reproducer is available at [2].

ROSE sockets use four sk->sk_state values: TCP_CLOSE, TCP_LISTEN,

TCP_SYN_SENT, and TCP_ESTABLISHED. rose_connect() already rejects

calls for TCP_ESTABLISHED (-EISCONN) and TCP_CLOSE with SS_CONNECTING

(-ECONNREFUSED), but lacks a check for TCP_SYN_SENT.

When rose_connect() is called a second time while the first connection

attempt is still in progress (TCP_SYN_SENT), it overwrites

rose->neighbour via rose_get_neigh(). If that returns NULL, the socket

is left with rose->state == ROSE_STATE_1 but rose->neighbour == NULL.

When the socket is subsequently closed, rose_release() sees

ROSE_STATE_1 and calls rose_write_internal() ->

rose_transmit_link(skb, NULL), causing a NULL pointer dereference.

Per connect(2), a second connect() while a connection is already in

progress should return -EALREADY. Add this missing check for

TCP_SYN_SENT to complete the state validation in rose_connect().

[1] https://syzkaller.appspot.com/bug?extid=d00f90e0af54102fb271

[2] https://gist.github.com/mrpre/9e6779e0d13e2c66779b1653fef80516

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-23460 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.10)
  • linux-kernel

Timeline and source

Published on 3 April 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-23460 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-03
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.10
linux-kernel — —

References

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