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CVE-2026-68433— libceph: bound get_version reply decode to front len

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基金会开源的一个操作系统内核。 Linux kernel 3.16版本存在安全漏洞，该漏洞源于libceph的handle_get_version_reply()函数使用msg->front_alloc_len作为解码边界，该值为重用回复缓冲区大小而非实际接收字节数，导致截断回复可通过ceph_decode_need()，从缓冲区中陈旧尾字节解码第二个u64，造成未初始化内存读取。

CVSS 8.6 · High EPSS 0.29% · P20

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 513a8243d67f8e8d27f2883bd2f18bc87c7ca376< 1307028f082756bf453e1889aee9983d30643a4b affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< 72a35070fcefa229b1b031aa7482ad3788e18f07 affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< 340e0386aa39da181015bee38f309018c335ce16 affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< d60de8253c85a02d0e6194b0735e7a562981a04c affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< 4e7ebfaa0d14cf50e44041bfde38070d6dbc019f affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< 0d934c934ec746d53fc7e4f53239792647bbae63 affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376< d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0 affected
… +10 more rows
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I. Basic Information for CVE-2026-68433

Vulnerability Information
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Vulnerability Title
libceph: bound get_version reply decode to front len
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: bound get_version reply decode to front len handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received. A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read. Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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基金会开源的一个操作系统内核。 Linux kernel 3.16版本存在安全漏洞，该漏洞源于libceph的handle_get_version_reply()函数使用msg->front_alloc_len作为解码边界，该值为重用回复缓冲区大小而非实际接收字节数，导致截断回复可通过ceph_decode_need()，从缓冲区中陈旧尾字节解码第二个u64，造成未初始化内存读取。
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 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 ~ 1307028f082756bf453e1889aee9983d30643a4b -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-68433

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III. Intelligence Information for CVE-2026-68433

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Patches & Fixes for CVE-2026-68433 (8)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68431 9.1 CRITICAL ksmbd: validate minimum PDU size for transform requests
CVE-2026-68432 8.8 HIGH vxlan: require CAP_NET_ADMIN in the device netns for changelink
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68445 7.8 HIGH drm/vc4: Prevent shader BO mappings from becoming writable
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68450 btrfs: free mapping node on duplicate reloc root insert
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup
CVE-2026-68434 serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68433

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