CVE-2026-72086scsi: xen: scsiback: Free the command tag on the TMR submit-failure path
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 6c01f0439098f00a64b246dc27479602201382f7
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 18d4f86816592586b38513543b5e1f9553bc271f
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < fbc1bdede66d0f2cde83b75d6524ce1a815bb69f
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 255fb7b0cdc947b1c01929c7f133281342a3a6b5
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 1357fb32d42ad8da193e6da285f09e6452feabda
- affected 2dbcdf33dbf61f44b29adb52338282c3d7840d0e – < 66aefc277ebb796ec285d550305535dc3fc0179f
- affected 4.6
- unaffected < 4.6
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33ad (opens in a new tab)
- https://git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7 (opens in a new tab)
- https://git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271f (opens in a new tab)
- https://git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f (opens in a new tab)
- https://git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5 (opens in a new tab)
- https://git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabda (opens in a new tab)
- https://git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59044 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-72086)Record last updated .