Answer in brief
CVE-2026-64535 records a Critical severity (CVSS 9.8) vulnerability in nvmet-tcp: Fix potential UAF when ddgst mismatch. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fda871c0ba5d2eed2cd1c881573168129da70058 <96fe2513df590e74b04253a45089cae75569570e || >=fda871c0ba5d2eed2cd1c881573168129da70058 <e091ff83d962f9ed00d9bd70443676de9fe98bdc || >=fda871c0ba5d2eed2cd1c881573168129da70058 <6f9442983a3e4227afd1c83a5251ddbca585ea21 || >=fda871c0ba5d2eed2cd1c881573168129da70058 <088ee46c18d99baef453afd74181dd40ade044ad || >=fda871c0ba5d2eed2cd1c881573168129da70058 <dbbd07d0a7020b80f6a7028e561908f7b83b3d5a || 91edfca6f8b364d60cde3ddefaf7d03ddf35774b || 4b17476d809273617d3317fa0d4ae78aa488d760 || >=5.10.20 <5.11 || >=5.11.3 <5.12 | 96fe2513df590e74b04253a45089cae75569570e, e091ff83d962f9ed00d9bd70443676de9fe98bdc, 6f9442983a3e4227afd1c83a5251ddbca585ea21, 088ee46c18d99baef453afd74181dd40ade044ad, dbbd07d0a7020b80f6a7028e561908f7b83b3d5a, 5.11, 5.12 |
| Linux/Linuxgeneric | 5.12 | Not reported |
| Linux/Linuxgeneric | >=91edfca6f8b364d60cde3ddefaf7d03ddf35774b <dfb902462bca478f050224ec7a7195aafa7643b1 || >=fda871c0ba5d2eed2cd1c881573168129da70058 <7e558308eba14c8136cb1e615f0c850f76d1fc0a || >=fda871c0ba5d2eed2cd1c881573168129da70058 <96fe2513df590e74b04253a45089cae75569570e || >=fda871c0ba5d2eed2cd1c881573168129da70058 <e091ff83d962f9ed00d9bd70443676de9fe98bdc || >=fda871c0ba5d2eed2cd1c881573168129da70058 <6f9442983a3e4227afd1c83a5251ddbca585ea21 || >=fda871c0ba5d2eed2cd1c881573168129da70058 <088ee46c18d99baef453afd74181dd40ade044ad || >=fda871c0ba5d2eed2cd1c881573168129da70058 <dbbd07d0a7020b80f6a7028e561908f7b83b3d5a || 4b17476d809273617d3317fa0d4ae78aa488d760 || >=5.10.20 <5.10.265 || >=5.11.3 <5.12 | dfb902462bca478f050224ec7a7195aafa7643b1, 7e558308eba14c8136cb1e615f0c850f76d1fc0a, 96fe2513df590e74b04253a45089cae75569570e, e091ff83d962f9ed00d9bd70443676de9fe98bdc, 6f9442983a3e4227afd1c83a5251ddbca585ea21, 088ee46c18d99baef453afd74181dd40ade044ad, dbbd07d0a7020b80f6a7028e561908f7b83b3d5a, 5.10.265, 5.12 |
Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.