CVE-2026-72086
scsi: xen: scsiback: Free the command tag on the TMR submit-failure path
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 6c01f0439098f00a64b246dc27479602201382f7 (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 18d4f86816592586b38513543b5e1f9553bc271f (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < fbc1bdede66d0f2cde83b75d6524ce1a815bb69f (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 255fb7b0cdc947b1c01929c7f133281342a3a6b5 (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 1357fb32d42ad8da193e6da285f09e6452feabda (affected, git) ≥ 2dbcdf33dbf61f44b29adb52338282c3d7840d0e; < 66aefc277ebb796ec285d550305535dc3fc0179f (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.6 (affected) ≥ 0; < 4.6 (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33adCNA: Linux
- https://git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7CNA: Linux
- https://git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271fCNA: Linux
- https://git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69fCNA: Linux
- https://git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5CNA: Linux
- https://git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabdaCNA: Linux
- https://git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179fCNA: Linux
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.