cbcvebase.
CVE-2022-49554
published 2025-02-26

CVE-2022-49554: In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous…

PriorityP416medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.22%
12.2th percentile
In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.

Affected

21 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.18.2-1 (bookworm)linux 5.18.2-1 (bookworm)
linuxlinux——
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < 3674d8a8dadd03a447dd21069d4dacfc3399b63b3674d8a8dadd03a447dd21069d4dacfc3399b63b
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < 645996efc2ae391246d595832aaa6f9d3cc338c7645996efc2ae391246d595832aaa6f9d3cc338c7
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < fc658c083904427abbf8f18280d517ee2668677cfc658c083904427abbf8f18280d517ee2668677c
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < fae05b2314b147a78fbed1dc4c645d9a66313758fae05b2314b147a78fbed1dc4c645d9a66313758
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < 3ec459c8810e658401be428d3168eacfc380bdd03ec459c8810e658401be428d3168eacfc380bdd0
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < 8ba7b7c1dad1f6503c541778f31b33f7f62eb9668ba7b7c1dad1f6503c541778f31b33f7f62eb966
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < c5402fb5f71f1a725f1e55d9c6799c0c7bec308fc5402fb5f71f1a725f1e55d9c6799c0c7bec308f
linuxlinux>= 77ff465799c60294e248000cd22ae8171da3304c < 2505a981114dcb715f8977b8433f7540854851d82505a981114dcb715f8977b8433f7540854851d8
linuxlinux_kernel>= 0 < 5.10.120-15.10.120-1
linuxlinux_kernel>= 0 < 5.18.2-15.18.2-1
linuxlinux_kernel>= 0 < 5.18.2-15.18.2-1
linuxlinux_kernel>= 0 < 5.18.2-15.18.2-1
linuxlinux_kernel>= 4.14 < 4.14.2824.14.282
linuxlinux_kernel>= 4.15 < 4.19.2464.19.246
linuxlinux_kernel>= 4.20 < 5.4.1975.4.197
linuxlinux_kernel>= 5.11 < 5.15.455.15.45
linuxlinux_kernel>= 5.16 < 5.17.135.17.13
linuxlinux_kernel>= 5.18 < 5.18.25.18.2
linuxlinux_kernel>= 5.5 < 5.10.1205.10.120

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv4.7MEDIUM
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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