CVE-2026-98118
UnknownSummary
A vulnerability was found in the Linux kernel's netfs subsystem related to readahead synchronization. The issue arises from the application thread adding folios to the rolling buffer while the collector thread processes them, potentially causing errors in determining folio order. The fix loads all folios selected by the VM upfront and drops references after I/O starts.
Risk Assessment
The vulnerability may cause incorrect readahead behavior, potentially leading to system crashes or unpredictable I/O operations. Organizations may experience stability issues on systems using network filesystems (e.g., NFS, CIFS).
Recommendation
Apply the official patch from your Linux kernel distributor as soon as possible. Monitor security updates for your distribution and test the fix in a staging environment before production deployment.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix readahead synchronisation issues by loading all folios upfront There are some synchronisation issues that derive from the app thread adding more folios to the rolling buffer whilst the collector thread is looking at them or trying to clear them, such as determining the setting of front_folio_order when the next folio hasn't been added yet, The reason for the rolling buffer approach is that loading the buffer upfront and then dropping all the refs just acquired is quite a slow operation, and loading progressively allows some of the cost to be deferred until after at least some of the I/O is started. Instead, a better way is to load all the folios into the rolling buffer upfront - and then drop the refs later, once the I/O is in progress. (Even better would be for the refs not to be there at all.) Fix this by changing the rolling buffer loader to load all the folios selected by the VM for readahead upfront into the folio queue. The folio queue is allocated a batch worth at a time as we don't know how many folios are involved (the readahead_control struct, alas, has a page count, not a folio count). The folio refs acquired from readahead are then dropped in bulk once the first subrequest is dispatched as it's quite a slow operation. The collector waits for NETFS_RREQ_NEED_PUT_RA_REFS to be cleared so that it doesn't unlock folios before the xarray has been scanned for them. This simplifies the buffer handling later and isn't noticeably slower as the xarray doesn't need to be modified and the folios are all already pre-locked.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS