Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 6c01f0439098f00a64b246dc27479602201382f7; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 18d4f86816592586b38513543b5e1f9553bc271f; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before fbc1bdede66d0f2cde83b75d6524ce1a815bb69f; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 255fb7b0cdc947b1c01929c7f133281342a3a6b5; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 1357fb32d42ad8da193e6da285f09e6452feabda; affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e before 66aefc277ebb796ec285d550305535dc3fc0179f |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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