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CVE-2026-64535— nvmet-tcp: Fix potential UAF when ddgst mismatch

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 存在安全漏洞，该漏洞源于数据摘要处理不当，导致在R2T数据传输中非最终H2C_DATA PDU摘要不匹配时，错误处理未标记命令完成，造成双重释放，从而引发释放后重用。

CVSS 9.8 · Critical EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux 91edfca6f8b364d60cde3ddefaf7d03ddf35774b< dfb902462bca478f050224ec7a7195aafa7643b1 affected
fda871c0ba5d2eed2cd1c881573168129da70058< 7e558308eba14c8136cb1e615f0c850f76d1fc0a affected
fda871c0ba5d2eed2cd1c881573168129da70058< 96fe2513df590e74b04253a45089cae75569570e affected
fda871c0ba5d2eed2cd1c881573168129da70058< e091ff83d962f9ed00d9bd70443676de9fe98bdc affected
fda871c0ba5d2eed2cd1c881573168129da70058< 6f9442983a3e4227afd1c83a5251ddbca585ea21 affected
fda871c0ba5d2eed2cd1c881573168129da70058< 088ee46c18d99baef453afd74181dd40ade044ad affected
fda871c0ba5d2eed2cd1c881573168129da70058< dbbd07d0a7020b80f6a7028e561908f7b83b3d5a affected
4b17476d809273617d3317fa0d4ae78aa488d760 affected
… +11 more rows
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I. Basic Information for CVE-2026-64535

Vulnerability Information
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Vulnerability Title
nvmet-tcp: Fix potential UAF when ddgst mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential UAF when ddgst mismatch Shivam Kumar found via vulnerability testing: When data digest is enabled on an NVMe/TCP connection and a digest mismatch occurs on a non-final H2C_DATA PDU during an R2T-based data transfer, the digest error handler in nvmet_tcp_try_recv_ddgst() calls nvmet_req_uninit() — which performs percpu_ref_put() on the submission queue — but does NOT mark the command as completed. It does not set cqe->status, does not modify rbytes_done, and does not clear any flag. When the subsequent fatal error triggers queue teardown, nvmet_tcp_uninit_data_in_cmds() iterates all commands, checks nvmet_tcp_need_data_in() for each one, and finds that the already-uninited command still appears to need data (because rbytes_done < transfer_len and cqe->status == 0). It therefore calls nvmet_req_uninit() a second time on the same command — a double percpu_ref_put against a single percpu_ref_get.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 存在安全漏洞，该漏洞源于数据摘要处理不当，导致在R2T数据传输中非最终H2C_DATA PDU摘要不匹配时，错误处理未标记命令完成，造成双重释放，从而引发释放后重用。
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 91edfca6f8b364d60cde3ddefaf7d03ddf35774b ~ dfb902462bca478f050224ec7a7195aafa7643b1 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-64535

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III. Intelligence Information for CVE-2026-64535

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Patches & Fixes for CVE-2026-64535 (5)

Same Patch Batch · Linux · 2026-07-27 · 26 CVEs total

CVE-2026-64534 9.8 CRITICAL nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64541 9.8 CRITICAL net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
CVE-2026-64551 9.1 CRITICAL sctp: validate STALE_COOKIE cause length before reading staleness
CVE-2026-64555 8.8 HIGH KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
CVE-2026-64554 8.8 HIGH netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
CVE-2026-64552 8.4 HIGH virtio-net: fix len check in receive_big()
CVE-2026-64548 8.4 HIGH bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
CVE-2026-64536 8.1 HIGH staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop
CVE-2026-64547 8.1 HIGH net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
CVE-2026-64540 8.1 HIGH usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
CVE-2026-64532 7.8 HIGH fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
CVE-2026-64543 7.8 HIGH tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
CVE-2026-64539 7.8 HIGH Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
CVE-2026-17523 7.8 HIGH can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
CVE-2026-64533 7.8 HIGH fs/ntfs3: validate lcns_follow in log_replay conversion
CVE-2026-64531 7.8 HIGH net: openvswitch: reject oversized nested action attrs
CVE-2026-64545 7.5 HIGH net, bpf: check master for NULL in xdp_master_redirect()
CVE-2026-64550 7.3 HIGH net: qualcomm: rmnet: validate MAP frame length before ingress parsing
CVE-2026-64546 7.1 HIGH drm/edid: fix OOB read in drm_parse_tiled_block()
CVE-2026-64544 crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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