Answer in brief
CVE-2026-72086 records a Unknown severity vulnerability in scsi: xen: scsiback: Free the command tag on the TMR submit-failure path. The current sources do not mark it as known exploited. The current feed maps 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.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <4567ce79fe2f84c3dcc3a91b22a377cf482d33ad || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <6c01f0439098f00a64b246dc27479602201382f7 || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <18d4f86816592586b38513543b5e1f9553bc271f || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <fbc1bdede66d0f2cde83b75d6524ce1a815bb69f || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <255fb7b0cdc947b1c01929c7f133281342a3a6b5 || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <1357fb32d42ad8da193e6da285f09e6452feabda || >=2dbcdf33dbf61f44b29adb52338282c3d7840d0e <66aefc277ebb796ec285d550305535dc3fc0179f | 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad, 6c01f0439098f00a64b246dc27479602201382f7, 18d4f86816592586b38513543b5e1f9553bc271f, fbc1bdede66d0f2cde83b75d6524ce1a815bb69f, 255fb7b0cdc947b1c01929c7f133281342a3a6b5, 1357fb32d42ad8da193e6da285f09e6452feabda, 66aefc277ebb796ec285d550305535dc3fc0179f |
| Linux/Linuxgeneric | 4.6 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: scsi: xen: scsiback: Free the command tag on the TMR submit-failure path scsiback_device_action() obtains a command tag in scsiback_get_pend_req() and submits a task-management request with target_submit_tmr(). When target_submit_tmr() fails it returns < 0 and scsiback jumps to the err: label, which sends a response but frees nothing, leaking the tag. Impact: a pvSCSI guest can leak the command tags of a LUN's session, stopping the LUN, by issuing VSCSIIF_ACT_SCSI_ABORT or RESET requests whenever target_submit_tmr() fails. transport_generic_free_cmd() cannot be used here. By the time target_submit_tmr() returns an error it has already run __target_init_cmd() (so se_cmd->cmd_kref is one, not zero), and on its target_get_sess_cmd() error path it has freed se_cmd->se_tmr_req via core_tmr_release_req() while leaving SCF_SCSI_TMR_CDB set and the pointer dangling. Letting the command release run target_free_cmd_mem() would then double-free se_tmr_req. Use the same helper, which returns just the tag, on this path too.
Quoted source text, attributed separately from HOL analysis.