CVE-2026-64535Critical· 9.8▾ MidnightIn 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 misma…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.5%
Last analysed / modified upstream
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.
Linux >= 91edfca6f8b364d60cde3ddefaf7d03ddf35774b < dfb902462bca478f050224ec7a7195aafa7643b1Linux >= fda871c0ba5d2eed2cd1c881573168129da70058 < 7e558308eba14c8136cb1e615f0c850f76d1fc0aLinux >= fda871c0ba5d2eed2cd1c881573168129da70058 < 96fe2513df590e74b04253a45089cae75569570eLinux >= fda871c0ba5d2eed2cd1c881573168129da70058 < e091ff83d962f9ed00d9bd70443676de9fe98bdcLinux >= fda871c0ba5d2eed2cd1c881573168129da70058 < 6f9442983a3e4227afd1c83a5251ddbca585ea21Linux >= fda871c0ba5d2eed2cd1c881573168129da70058 < 088ee46c18d99baef453afd74181dd40ade044adLinux >= fda871c0ba5d2eed2cd1c881573168129da70058 < dbbd07d0a7020b80f6a7028e561908f7b83b3d5aLinux 4b17476d809273617d3317fa0d4ae78aa488d760Linux >= 5.10.20 < 5.10.265Linux >= 5.11.3 < 5.12Linux 5.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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