Critical 9.1Published May 28, 2026

CVE-2026-46119libceph: Fix slab-out-of-bounds access in auth message processing

Updated under an hour ago (Oct 27, 2026, 12:10 AM ET)

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Exploited in the last 30 days

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: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Undergoing Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc before c2374b92c729d0388a538b3cde7b3e3b5e55ef39; from 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc before 38fdf04c602d52c42c67fc1617211492753b7e8b; 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc builds before 2ae0afd98432536562fa8261538ae795446f0589; from 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc before 408e85ee708b6aa03eeb0220ffa0915f4d407181; from 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc before b7df9fbd4869fdfe09a3f501ffd228486521e062; from 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc before 8517b6c8d2c759918ba0058cb6c7e14d59643202; 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc builds before 1c439de70b1c3eb3c6bffa8245c16b9fc318f114	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.34.1 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 2.6.34; 2.6.34; and 5 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.