Answer in brief
CVE-2026-98975 records a High severity (CVSS 7.8) vulnerability in xfs: stop exchanging reflink flags when exchanging mappings. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f0bc4d134b46607967bda1205ce3226a1bd95f42 <1fa2f3a7ef7ee0f2503a4b0afe24bc8c9d0820be || >=f0bc4d134b46607967bda1205ce3226a1bd95f42 <7d3b9b2c9dc57f93f36c716ab752548cb4db9900 || >=f0bc4d134b46607967bda1205ce3226a1bd95f42 <4756c94260e69ce42612b8220c3614f02f7a11d5 || >=f0bc4d134b46607967bda1205ce3226a1bd95f42 <d84d6c1a7f1e2de9e601703a326a4c1b7b421943 | 1fa2f3a7ef7ee0f2503a4b0afe24bc8c9d0820be, 7d3b9b2c9dc57f93f36c716ab752548cb4db9900, 4756c94260e69ce42612b8220c3614f02f7a11d5, d84d6c1a7f1e2de9e601703a326a4c1b7b421943 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: xfs: stop exchanging reflink flags when exchanging mappings When an exchange covers both files from offset 0 to i_disk_size, xmi_can_exchange_reflink_flags() assumes every mapping moved and hands the reflink flag over to the other file. That assumption is wrong. A file can still own shared blocks past i_disk_size, e.g. after EXCHANGE_RANGE_TO_EOF sets a smaller size without unmapping anything. The flag is cleared anyway, and the next write to such a block happens in place instead of CoW, corrupting the other file that shares it. Commit a23eca88448e ("xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN") fixed one instance of this. Rather than add another special case, stop moving the flags. xfs_exchmaps_ensure_reflink() already sets the flag on both inodes before the exchange, so both just keep it. Nothing sets CLEAR_INO{1,2}_REFLINK anymore. Intents logged by older kernels may still carry them; recovery already masks them off, so they stay in the log format mask and are ignored. XFS_IOC_SWAPEXT has the same problem: it moves the reflink flag from one inode to the other along with the extents. Just removing that is not enough here: the exchange path flags both inodes up front in xfs_exchmaps_ensure_reflink(), but swapext has no such step, so the inode receiving the shared extents would be left without the flag. Set it on both inodes instead, and make sure both have a CoW fork, since an inode with the reflink flag is expected to have one. The flag now stays until FALLOC_FL_UNSHARE_RANGE, xfs_scrub, or a truncate to zero removes it.
Quoted source text, attributed separately from HOL analysis.