Linux Kernel up to 7.2-rc3 scsiback scsiback_device_action double free

CVSS Meta Temp Score
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CTI Interest Score
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6.2$5k-$25k0.47+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2-rc3. It has been rated as critical. This affects the function scsiback_device_action of the component scsiback. The manipulation leads to double free. This vulnerability is referenced as CVE-2026-72086. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2-rc3 and classified as critical. This issue affects the function scsiback_device_action of the component scsiback. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-72086 since 08/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc4 eliminates this vulnerability. Applying the patch 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad/6c01f0439098f00a64b246dc27479602201382f7/18d4f86816592586b38513543b5e1f9553bc271f/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f/255fb7b0cdc947b1c01929c7f133281342a3a6b5/1357fb32d42ad8da193e6da285f09e6452feabda/66aefc277ebb796ec285d550305535dc3fc0179f is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc4
Patch: 4567ce79fe2f84c3dcc3a91b22a377cf482d33ad/6c01f0439098f00a64b246dc27479602201382f7/18d4f86816592586b38513543b5e1f9553bc271f/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f/255fb7b0cdc947b1c01929c7f133281342a3a6b5/1357fb32d42ad8da193e6da285f09e6452feabda/66aefc277ebb796ec285d550305535dc3fc0179f

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72086 (🔒)
GCVE (CVE): GCVE-0-2026-72086
GCVE (VulDB): GCVE-100-390425

Entryinfo

Created: 08/15/2026 11:09
Changes: 08/15/2026 11:09 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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