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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-64535

nvmet-tcp: Fix potential UAF when ddgst mismatch

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 91edfca6f8b364d60cde3ddefaf7d03ddf35774b to < dfb902462bca478f050224ec7a7195aafa7643b1affected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < 7e558308eba14c8136cb1e615f0c850f76d1fc0aaffected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < 96fe2513df590e74b04253a45089cae75569570eaffected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < e091ff83d962f9ed00d9bd70443676de9fe98bdcaffected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < 6f9442983a3e4227afd1c83a5251ddbca585ea21affected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < 088ee46c18d99baef453afd74181dd40ade044adaffected
  • fda871c0ba5d2eed2cd1c881573168129da70058 to < dbbd07d0a7020b80f6a7028e561908f7b83b3d5aaffected
  • 4b17476d809273617d3317fa0d4ae78aa488d760affected
  • 5.10.20 to < 5.10.265affected
  • 5.11.3 to < 5.12affected

Linux Linux

Default version status: affected

  • 5.12affected
  • 0 to < 5.12unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1 to ≤ *unaffected

References