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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于libceph认证消息处理中存在越界访问，可能导致发送超出缓冲区的内容。

CVSS 9.1 · Critical EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< c2374b92c729d0388a538b3cde7b3e3b5e55ef39 affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< 38fdf04c602d52c42c67fc1617211492753b7e8b affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< 2ae0afd98432536562fa8261538ae795446f0589 affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< 408e85ee708b6aa03eeb0220ffa0915f4d407181 affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< b7df9fbd4869fdfe09a3f501ffd228486521e062 affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< 8517b6c8d2c759918ba0058cb6c7e14d59643202 affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc< 1c439de70b1c3eb3c6bffa8245c16b9fc318f114 affected
2.6.34 affected
… +8 more rows
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I. Basic Information for CVE-2026-46119

Vulnerability Information
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Vulnerability Title
libceph: Fix slab-out-of-bounds access in auth message processing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于libceph认证消息处理中存在越界访问，可能导致发送超出缓冲区的内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc ~ c2374b92c729d0388a538b3cde7b3e3b5e55ef39 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-46119

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III. Intelligence Information for CVE-2026-46119

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Patches & Fixes for CVE-2026-46119 (7)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46178 7.8 HIGH RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()
CVE-2026-46173 7.8 HIGH exit: prevent preemption of oopsing TASK_DEAD task
CVE-2026-46227 7.8 HIGH sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46119

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