CVE-2026-72086None▾ SunlitIn 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-m…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 4567ce79fe2f84c3dcc3a91b22a377cf482d33adLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 6c01f0439098f00a64b246dc27479602201382f7Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 18d4f86816592586b38513543b5e1f9553bc271fLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < fbc1bdede66d0f2cde83b75d6524ce1a815bb69fLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 255fb7b0cdc947b1c01929c7f133281342a3a6b5Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 1357fb32d42ad8da193e6da285f09e6452feabdaLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 66aefc277ebb796ec285d550305535dc3fc0179fLinux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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