zsmalloc: fix races between asynchronous zspage free and page migration
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.14 and later | 4.14.282, 4.19.246, 5.4.197, 5.10.120, 5.15.45, 5.17.13, 5.18.2, 5.19 | Patch available | CNA |
- Linux VendorLinux Affected 4.14 and later Fixed in 4.14.282, 4.19.246, 5.4.197, 5.10.120, 5.15.45, 5.17.13, 5.18.2, 5.19 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.14 to before 4.14.282; 4.15 to before 4.19.246; 4.20 to before 5.4.197; 5.5 to before 5.10.120; 5.11 to before 5.15.45; 5.16 to before 5.17.13; 5.18 to before 5.18.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14 to before 4.14.282; 4.15 to before 4.19.246; 4.20 to before 5.4.197; 5.5 to before 5.10.120; 5.11 to before 5.15.45; 5.16 to before 5.17.13; 5.18 to before 5.18.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.14.282, 4.19.246, 5.4.197, 5.10.120, 5.15.45, 5.17.13, 5.18.2, 5.19
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49554
- 2026-10-03 Alias added: GHSA-wv76-pjmf-rxjc
- 2026-10-16 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b
- https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7
- https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c
- https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758
- https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0
- https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966
- https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f
- https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2022-49554 · CVE Program
- CVE-2022-49554 · NVD
- FIRST EPSS
- GHSA-wv76-pjmf-rxjc · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49554 · Red Hat security data · CC BY 4.0
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