CVE-2026-72086
Description
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.
How to fix
- Linux Linux4567ce79fe2f84c3dcc3a91b22a377cf482d33ad, 6c01f0439098f00a64b246dc27479602201382f7, 18d4f86816592586b38513543b5e1f9553bc271f, fbc1bdede66d0f2cde83b75d6524ce1a815bb69f, 255fb7b0cdc947b1c01929c7f133281342a3a6b5, 1357fb32d42ad8da193e6da285f09e6452feabda, 66aefc277ebb796ec285d550305535dc3fc0179f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 6c01f0439098f00a64b246dc27479602201382f7, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 18d4f86816592586b38513543b5e1f9553bc271f, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < fbc1bdede66d0f2cde83b75d6524ce1a815bb69f, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 255fb7b0cdc947b1c01929c7f133281342a3a6b5, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 1357fb32d42ad8da193e6da285f09e6452feabda, 2dbcdf33dbf61f44b29adb52338282c3d7840d0e ≤ v < 66aefc277ebb796ec285d550305535dc3fc0179f, 4.6 | 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad, 6c01f0439098f00a64b246dc27479602201382f7, 18d4f86816592586b38513543b5e1f9553bc271f, fbc1bdede66d0f2cde83b75d6524ce1a815bb69f, 255fb7b0cdc947b1c01929c7f133281342a3a6b5, 1357fb32d42ad8da193e6da285f09e6452feabda, 66aefc277ebb796ec285d550305535dc3fc0179f |
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