CVE-2022-49554High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
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.
linux_kernel >= 4.14, < 4.14.282linux_kernel >= 4.15, < 4.19.246linux_kernel >= 4.20, < 5.4.197linux_kernel >= 5.5, < 5.10.120linux_kernel >= 5.11, < 5.15.45linux_kernel >= 5.16, < 5.17.13linux_kernel >= 5.18, < 5.18.2Upgrade past the affected range:
linux_kernel 5.18.2Connected by shared product, vendor, weakness, or advisory.
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