Linux Kernel up to 7.2.5 scsi sd_set_special_bvec memory leak

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 7.2.5. The affected element is the function sd_set_special_bvec of the component scsi. Performing a manipulation results in memory leak. This vulnerability is reported as CVE-2026-90267. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as critical. This affects the function sd_set_special_bvec of the component scsi. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: scsi: sd: Fix special_vec mempool leak when scsi_alloc_sgtables() fails sd_set_special_bvec() allocates a special payload page for UNMAP and WRITE SAME commands. If scsi_alloc_sgtables() fails afterward in sd_setup_unmap_cmnd() or sd_setup_write_same{10,16}_cmnd(), the SCSI midlayer does not call uninit_command() because RQF_DONTPREP is not set yet, leaking the page. Call sd_uninit_command() on error, and clear RQF_SPECIAL_PAYLOAD after freeing the page.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-90267 since 09/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 5d7d1b8b525e5eff33a01d07dfcf7bdd3b6d790d/bb31844d88b77138b67aa20c3600203baff40140 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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