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CVE-2022-49053: scsi: target: tcmu: Fix possible page UAF

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: tcmu: Fix possible page UAF tcmu_try_get_data_page() looks up pages under cmdr_lock, but it does not take refcount properly and just returns page pointer. When tcmu_try_get_data_page() returns, the returned page may have been freed by tcmu_blocks_release(). We need to get_page() under cmdr_lock to avoid concurrent tcmu_blocks_release().

Affected products

• Linux kernel: before 4.14.276; from 4.15 before 4.19.239; from 4.20 before 5.4.190; from 5.5 before 5.10.112; from 5.11 before 5.15.35; from 5.16 before 5.17.4 — fixed in 4.14.276, 4.19.239, 5.10.112, 5.15.35, 5.17.4, 5.4.190

How to fix

Upgrade to a fixed version: Linux kernel 4.14.276, 4.19.239, 5.10.112, 5.15.35. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/a6968f7a367f128d120447360734344d5a3d5336
• https://git.kernel.org/stable/c/a9564d84ed9f6ee71017d062d0d2182154294a4b
• https://git.kernel.org/stable/c/aec36b98a1bbaa84bfd8299a306e4c12314af626
• https://git.kernel.org/stable/c/b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322
• https://git.kernel.org/stable/c/d7c5d79e50be6e06b669141e3db1f977a0dd4e8e
• https://git.kernel.org/stable/c/e3e0e067d5b34e4a68e3cc55f8eebc413f56f8ed
• https://git.kernel.org/stable/c/fb7a5115422fbd6a4d505e8844f1ef5529f10489

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