What’s Vulnerable › Vulnerabilities

CVE-2025-40259: scsi: sg: Do not sleep in atomic context

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-04 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Do not sleep in atomic context sg_finish_rem_req() calls blk_rq_unmap_user(). The latter function may sleep. Hence, call sg_finish_rem_req() with interrupts enabled instead of disabled.

Affected products

• Linux kernel: from 3.16.85 before 3.17; from 3.18.101 before 3.19; from 4.1.52 before 4.2; from 4.4.123 before 4.5; from 4.9.89 before 4.10; 4.12 — fixed in 3.17, 3.19, 4.10, 4.2, 4.5, 6.18

How to fix

Upgrade to a fixed version: Linux kernel 3.17, 3.19, 4.10, 4.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/109afbd88ecc46b6cc7551367222387e97999765
• https://git.kernel.org/stable/c/11eeee00c94d770d4e45364060b5f1526dfe567b
• https://git.kernel.org/stable/c/3dfd520c3b4ffe69e0630c580717d40447ab842f
• https://git.kernel.org/stable/c/6983d8375c040bb449d2187f4a57a20de01244fe
• https://git.kernel.org/stable/c/90449f2d1e1f020835cba5417234636937dd657e
• https://git.kernel.org/stable/c/b2c0340cfa25c5c1f65e8590cc1a2dc97d14ef0f
• https://git.kernel.org/stable/c/b343cee5df7e750d9033fba33e96fc4399fa88a5
• https://git.kernel.org/stable/c/db6ac8703ab2b473e1ec845f57f6dd961a388d9f

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