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.
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
2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 4567ce79fe2f84c3dcc3a91b22a377cf482d33adaffected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 6c01f0439098f00a64b246dc27479602201382f7affected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 18d4f86816592586b38513543b5e1f9553bc271faffected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < fbc1bdede66d0f2cde83b75d6524ce1a815bb69faffected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 255fb7b0cdc947b1c01929c7f133281342a3a6b5affected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 1357fb32d42ad8da193e6da285f09e6452feabdaaffected2dbcdf33dbf61f44b29adb52338282c3d7840d0e to < 66aefc277ebb796ec285d550305535dc3fc0179faffected
Linux Linux
Default version status: affected
4.6affected0 to < 4.6unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33ad ↗
- https://git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7 ↗
- https://git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271f ↗
- https://git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f ↗
- https://git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5 ↗
- https://git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabda ↗
- https://git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179f ↗