CVE-2026-46024
Published: May 28, 2026Last modified: June 2, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply() If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL. This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.175-r0) |
| 25 LTS | linux-lts | Fixed (6.12.87-r0) | |
| Stream | linux-lts | Fixed (6.12.87-r0) |
References
- https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77
- https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d
- https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e
- https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e
- https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548
- https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df
- https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118