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CVE-2026-64018— net: mana: validate rx_req_idx to prevent out-of-bounds array access

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基金会开源的一款操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于在mana_hwc_rx_event_handler()函数中，对rx_req_idx缺乏边界检查，可能导致越界数组访问。

CVSS 9.3 · Critical EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 5ddc715324badd7f2641bc177db1d027b402adae affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< ff1d5af207bcea857d45fe81505f1bc4b29eaef0 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 763a372d344fb12fae566d36ddb46e92454ad58c affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< fa627a5eaa83fc0261f44ef3769693b886ca6e27 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 355e9f2b2a7887ca38100127989af3e422ba71d0 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< b809d0409991b75a6cff846a5ac27c3062953f84 affected
5.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-64018

Vulnerability Information
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Vulnerability Title
net: mana: validate rx_req_idx to prevent out-of-bounds array access
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/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基金会开源的一款操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于在mana_hwc_rx_event_handler()函数中，对rx_req_idx缺乏边界检查，可能导致越界数组访问。
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 ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f ~ 5ddc715324badd7f2641bc177db1d027b402adae -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-64018

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III. Intelligence Information for CVE-2026-64018

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Patches & Fixes for CVE-2026-64018 (4)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64018

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