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Vulnerability record · CVE-2026-46119 · published 28 May 2026

CVE-2026-46119: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a (potentially corrupted) message of type CEPH_MSG_AUTH_REPLY contains a positive value in its result field, it is treated as an error code by ceph_handle_auth_reply() and returned to handle_auth_reply(). Thereafter, an attempt is made to send the preallocated message of type CEPH_MSG_AUTH, where the returned value is interpreted as the size of the front segment to send. If the result value in the message is greater than the size of the memory buffer allocated for the front segment, an out-of-bounds access occurs, and the content of the memory region beyond this buffer is sent out. This patch fixes the issue by treating only negative values in the result field as errors. Positive values are therefore treated as success in the same way as a zero value. Additionally, a BUG_ON is added to __send_prepared_auth_request() comparing the len parameter to front_alloc_len to prevent sending the message if it exceeds the bounds of the allocation and to make it easier to catch any logic flaws leading to this.

9.1 CVSS 3.1 Critical EPSS 0.72% · top 48.0% CWE-125 · Out-of-bounds read Undergoing Analysis
9.1CVSS 3.1 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
24 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a (potentially corrupted) message of type CEPH_MSG_AUTH_REPLY contains a positive value in its result field, it is treated as an error code by ceph_handle_auth_reply() and returned to handle_auth_reply(). Thereafter, an attempt is made to send the preallocated message of type CEPH_MSG_AUTH, where the returned value is interpreted as the size of the front segment to send. If the result value in the message is greater than the size of the memory buffer allocated for the front segment, an out-of-bounds access occurs, and the content of the memory region beyond this buffer is sent out. This patch fixes the issue by treating only negative values in the result field as errors. Positive values are therefore treated as success in the same way as a zero value. Additionally, a BUG_ON is added to __send_prepared_auth_request() comparing the len parameter to front_alloc_len to prevent sending the message if it exceeds the bounds of the allocation and to make it easier to catch any logic flaws leading to this.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1c439de70b1c3eb3c6bffa8245c16b9fc318f114 Patch
https://git.kernel.org/stable/c/2ae0afd98432536562fa8261538ae795446f0589 Patch
https://git.kernel.org/stable/c/38fdf04c602d52c42c67fc1617211492753b7e8b Patch
https://git.kernel.org/stable/c/408e85ee708b6aa03eeb0220ffa0915f4d407181 Patch
https://git.kernel.org/stable/c/8517b6c8d2c759918ba0058cb6c7e14d59643202 Patch
https://git.kernel.org/stable/c/b7df9fbd4869fdfe09a3f501ffd228486521e062 Patch
https://git.kernel.org/stable/c/c2374b92c729d0388a538b3cde7b3e3b5e55ef39 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46119), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.