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CVE-2022-49053

scsi: target: tcmu: Fix possible page UAF

CVSS 7.8 HIGHEPSS 0.3%CWE-416
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().
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux

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References
https://git.kernel.org/stable/c/a6968f7a367f128d120447360734344d5a3d5336https://git.kernel.org/stable/c/a9564d84ed9f6ee71017d062d0d2182154294a4bhttps://git.kernel.org/stable/c/aec36b98a1bbaa84bfd8299a306e4c12314af626https://git.kernel.org/stable/c/b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322https://git.kernel.org/stable/c/d7c5d79e50be6e06b669141e3db1f977a0dd4e8ehttps://git.kernel.org/stable/c/e3e0e067d5b34e4a68e3cc55f8eebc413f56f8edhttps://git.kernel.org/stable/c/fb7a5115422fbd6a4d505e8844f1ef5529f10489