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CVE-2026-90201— net: page_pool: fix UAF in __page_pool_release_netmem_dma on xa_cmpxchg race

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已被修复： net: page_pool: 修复 xa_cmpxchg 竞争条件下的 __page_pool_release_netmem_dma 使用已释放内存（UAF）问题 该 bug 是在 arm64 架构下，对 hns3 驱动程序进行通道重新配置（ / ）并同时运行 iperf3 流量测试时发现的。当 中的 与另一 CPU 上通过 返回页面的操作并发执行时，该竞争条件会间歇性触发。 中的一个 WARN 警告暴露了由 cmpxchg 失败方残留的悬空 DMA 索引位，从而引导了

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1202 · Indirect Command Execution

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 4f51fb0d257ff4d406ec27966902de075e3b118e< bbfef303f980c1c078b8fa142e10a0e2fbcdd247 affected
ee62ce7a1d909ccba0399680a03c2dee83bcae95< 424a9fc4876cc7f28e9cb0aa8d92e920d726e350 affected
ee62ce7a1d909ccba0399680a03c2dee83bcae95< 9b65b0253ad5a66f73efee9a79a21a1e2b57cf59 affected
ee62ce7a1d909ccba0399680a03c2dee83bcae95< 24ef02f934eeb48830cff6b739abc3c62b1d107b affected
c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4 affected
6.12.34< 6.12.110 affected
6.15.3< 6.16 affected
6.16 affected
… +5 more rows
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I. Basic Information for CVE-2026-90201

Vulnerability Information
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Vulnerability Title
net: page_pool: fix UAF in __page_pool_release_netmem_dma on xa_cmpxchg race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: page_pool: fix UAF in __page_pool_release_netmem_dma on xa_cmpxchg race This bug was discovered while testing the hns3 driver under channel reconfiguration (`ethtool -L` / `ethtool -G`) with iperf3 traffic on arm64. The race is intermittently triggered when page_pool_destroy() runs page_pool_scrub() concurrently with page return via page_pool_put_netmem() on a different CPU. A WARN in page_pool_clear_pp_info() surfaced the dangling DMA index bits left by the cmpxchg loser, which led to the investigation. page_pool_scrub() iterates pool->dma_mapped via xa_for_each() with no page ref held. __page_pool_release_netmem_dma() currently reads and writes netmem fields (dma_addr, DMA index bits in pp_magic) after xa_cmpxchg() returns. The unref path calls put_page() unconditionally regardless of the cmpxchg outcome; when it loses the cmpxchg, it still frees the page before the scrub winner finishes these netmem accesses, so scrub touches a freed page -- a Use-After-Free. Fix this by splitting the DMA release into two functions: 1. __page_pool_unmap_netmem_dma() caches dma_addr before xa_cmpxchg(), does the cmpxchg to remove the DMA mapping, and calls dma_unmap on the cached address. It never touches netmem fields after the cmpxchg, making it safe for the scrub path which holds no page ref. 2. __page_pool_release_netmem_dma() wraps the above and additionally clears dma_addr and DMA index bits in netmem fields. This is safe only when the caller holds a page ref, so it is used by the return path (page_pool_return_netmem). The scrub path calls __page_pool_unmap_netmem_dma() directly; the return path calls __page_pool_release_netmem_dma().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4f51fb0d257ff4d406ec27966902de075e3b118e ~ bbfef303f980c1c078b8fa142e10a0e2fbcdd247 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-90201

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III. Intelligence Information for CVE-2026-90201

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Patches & Fixes for CVE-2026-90201 (4)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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