CVE-2022-21546: scsi: target: Fix WRITE_SAME No Data Buffer crash

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-02 · updated 2026-08-04
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix WRITE_SAME No Data Buffer crash In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like "sg_write_same --ndob" we will crash in target_core_iblock/file's execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL. This patch adds a check for the NDOB bit in the common WRITE SAME code because we don't support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer.

Affected products

Debian Linux: 11.0
Linux kernel: before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.182; from 5.16 before 5.19; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5, 5.19-rc6 — fixed in 5.10.238, 5.15.182, 5.19, 5.4.294

How to fix

Upgrade to a fixed version: Linux kernel 5.10.238, 5.15.182, 5.19, 5.4.294. Check the vendor advisory for mitigations.

References

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