CVE-2025-39725mm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: mm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list In shrink_folio_list(), the hwpoisoned folio may be large folio, which can't be handled by unmap_poisoned_folio(). For THP, try_to_unmap_one() must be passed with TTU_SPLIT_HUGE_PMD to split huge PMD first and then retry. Without TTU_SPLIT_HUGE_PMD, we will trigger null-ptr deref of pvmw.pte. Even we passed TTU_SPLIT_HUGE_PMD, we will trigger a WARN_ON_ONCE due to the page isn't in swapcache. Since UCE is rare in real world, and race with reclaimation is more rare, just skipping the hwpoisoned large folio is enough. memory_failure() will handle it if the UCE is triggered again. This happens when memory reclaim for large folio races with memory_failure(), and will lead to kernel panic. The race is as follows: cpu0 cpu1 shrink_folio_list memory_failure TestSetPageHWPoison unmap_poisoned_folio --> trigger BUG_ON due to unmap_poisoned_folio couldn't handle large folio [tujinjiang@huawei.com: add comment to unmap_poisoned_folio()]
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- May 23, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1c9798bf8145a92abf45aa9d38a6406d9eb8bdf0 before 656eaddbc952e1baae2f69281c22debe22140312; from 1b0449544c6482179ac84530b61fc192a6527bfd before c1101113d45838a823188ae25c61af97552a28ae; from 1b0449544c6482179ac84530b61fc192a6527bfd before 9f1e8cd0b7c4c944e9921b52a6661b5eda2705ab; 912e9f0300c3564b72a8808db406e313193a37ad; from 6.12.26 before 6.12.41; from 6.14.5 before 6.15 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12.26 before 6.12.41; from 6.14.5 before 6.15.9; 6.16; 6.16; 6.16; 6.16; 6.16; 6.16; and 1 more ranges | NVD |
References
- https://git.kernel.org/stable/c/656eaddbc952e1baae2f69281c22debe22140312patch
- https://git.kernel.org/stable/c/c1101113d45838a823188ae25c61af97552a28aepatch
- https://git.kernel.org/stable/c/9f1e8cd0b7c4c944e9921b52a6661b5eda2705abpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.