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CVE-2026-43405— libceph: Use u32 for non-negative values in ceph_monmap_decode()

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ceph_monmap_decode()中blob_len和num_mon使用有符号int，可能导致整数溢出和内存分配失败。

CVSS 7.5 · High EPSS 0.70% · P52

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< ee5588e2bc41acb73f6676c0520420c107cd0140 affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< 86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< 5f2806684b05bd24d05c091083b8e2517ba8ffac affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< b268984ae88cb0dcd7a8e8263962c748448e26e8 affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< 08bc6173fd611ad5a40f472bf5f15b92aea0fe40 affected
a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c< 770444611f047dbfd4517ec0bc1b179d40c2f346 affected
5.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-43405

Vulnerability Information
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Vulnerability Title
libceph: Use u32 for non-negative values in ceph_monmap_decode()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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ceph_monmap_decode()中blob_len和num_mon使用有符号int，可能导致整数溢出和内存分配失败。
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 a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c ~ ee5588e2bc41acb73f6676c0520420c107cd0140 -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-43405

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III. Intelligence Information for CVE-2026-43405

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Patches & Fixes for CVE-2026-43405 (7)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43365 8.2 HIGH xfs: fix undersized l_iclog_roundoff values
CVE-2026-43452 8.2 HIGH netfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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