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CVE-2026-64034— net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer

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DMA缓冲区中hwc_msg_id存在TOCTOU双重获取问题，可能导致硬件修改检查与使用之间的值，绕过边界验证。

CVSS 9.3 · Critical EPSS 0.21% · P10

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< a201c66edf2ebc6cfdc3813a889ba20fecebfae3 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 70ad2dff8d052a85dfef15715b531f38a29108cf affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 566f42fb67a7ebfed6650e407e5b72e6b3e83bf7 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 6180a06bbc99fd9114b8db4be6c4d46e40f046ef affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 09ec063d87c2dd3fa6f3561361a017bd882e9f37 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 3c4db56ccd13dd020fbf43afabaee74a40ec75e4 affected
ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f< 35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 affected
5.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-64034

Vulnerability Information
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Vulnerability Title
net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic. DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation. Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().
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DMA缓冲区中hwc_msg_id存在TOCTOU双重获取问题，可能导致硬件修改检查与使用之间的值，绕过边界验证。
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 ~ a201c66edf2ebc6cfdc3813a889ba20fecebfae3 -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-64034

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III. Intelligence Information for CVE-2026-64034

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Patches & Fixes for CVE-2026-64034 (7)

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-2026-63800 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-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
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-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
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

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