{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72086","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.905Z","datePublished":"2026-08-15T05:52:34.822Z","dateUpdated":"2026-08-17T05:07:56.806Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:07:56.806Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: xen: scsiback: Free the command tag on the TMR submit-failure path\n\nscsiback_device_action() obtains a command tag in\nscsiback_get_pend_req() and submits a task-management request with\ntarget_submit_tmr(). When target_submit_tmr() fails it returns < 0 and\nscsiback jumps to the err: label, which sends a response but frees\nnothing, leaking the tag.\n\nImpact: a pvSCSI guest can leak the command tags of a LUN's session,\nstopping the LUN, by issuing VSCSIIF_ACT_SCSI_ABORT or RESET requests\nwhenever target_submit_tmr() fails.\n\ntransport_generic_free_cmd() cannot be used here. By the time\ntarget_submit_tmr() returns an error it has already run\n__target_init_cmd() (so se_cmd->cmd_kref is one, not zero), and on its\ntarget_get_sess_cmd() error path it has freed se_cmd->se_tmr_req via\ncore_tmr_release_req() while leaving SCF_SCSI_TMR_CDB set and the\npointer dangling. Letting the command release run target_free_cmd_mem()\nwould then double-free se_tmr_req.\n\nUse the same helper, which returns just the tag, on this path too."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/xen/xen-scsiback.c"],"versions":[{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"4567ce79fe2f84c3dcc3a91b22a377cf482d33ad","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"6c01f0439098f00a64b246dc27479602201382f7","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"18d4f86816592586b38513543b5e1f9553bc271f","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"fbc1bdede66d0f2cde83b75d6524ce1a815bb69f","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"255fb7b0cdc947b1c01929c7f133281342a3a6b5","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"1357fb32d42ad8da193e6da285f09e6452feabda","status":"affected","versionType":"git"},{"version":"2dbcdf33dbf61f44b29adb52338282c3d7840d0e","lessThan":"66aefc277ebb796ec285d550305535dc3fc0179f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/xen/xen-scsiback.c"],"versions":[{"version":"4.6","status":"affected"},{"version":"0","lessThan":"4.6","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33ad"},{"url":"https://git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7"},{"url":"https://git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271f"},{"url":"https://git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f"},{"url":"https://git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5"},{"url":"https://git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabda"},{"url":"https://git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179f"}],"title":"scsi: xen: scsiback: Free the command tag on the TMR submit-failure path","x_generator":{"engine":"bippy-1.2.0"}}}}