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CVE-2026-43281— mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

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fw_mbox_index_xlate函数缺乏边界检查，可能导致越界访问。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< 2c7ff651ec6b660c7c96a36db9328b3232f555d8 affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< ec0874447895b994182a962d2fee9ef075de5efd affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< 2662ed331a69c0b551f78af58f12eb629a89a36f affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< 31c4c67dec3362094a6747a171a4848e98542265 affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< 01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< 4caae8168d1b808c7d4ff481295292e3f97f90fb affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< f50b39fd7c72a8734153644ee945ca0d8b2e65ab affected
2b6d83e2b8b7de82331a6a1dcd64b51020a6031c< fcd7f96c783626c07ee3ed75fa3739a8a2052310 affected
… +10 more rows
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I. Basic Information for CVE-2026-43281

Vulnerability Information
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Vulnerability Title
mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate() Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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fw_mbox_index_xlate函数缺乏边界检查，可能导致越界访问。
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 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c ~ 2c7ff651ec6b660c7c96a36db9328b3232f555d8 -
Linux Linux 3.18 -

II. Public POCs for CVE-2026-43281

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III. Intelligence Information for CVE-2026-43281

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Patches & Fixes for CVE-2026-43281 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-43186 9.8 CRITICAL ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-43185 9.8 CRITICAL ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-43125 9.8 CRITICAL dlm: validate length in dlm_search_rsb_tree
CVE-2026-43208 9.8 CRITICAL net: do not pass flow_id to set_rps_cpu()
CVE-2026-43198 9.8 CRITICAL tcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-43114 9.4 CRITICAL netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-43117 9.1 CRITICAL btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43215 8.8 HIGH cifs: Fix locking usage for tcon fields
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43187 8.8 HIGH xfs: delete attr leaf freemap entries when empty
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43281

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