CVE-2026-97548
Linux: xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
Linux LinuxOperating systemsCVSS
7.8HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in108114437915e61e8f88d1cbcc442c3f886a347eAlso 84316cb25af95a60e655ccc8fe646bb5ad631b71CVE List
What fixes it
- 108114437915e61e8f88d1cbcc442c3f886a347eLinuxCVE List
- 84316cb25af95a60e655ccc8fe646bb5ad631b71LinuxCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
In the Linux kernel, the following vulnerability has been resolved:
xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
The _maxlevels_ondisk functions are used to compute the size of in-memory btree cursors for each btree type. Unfortunately, LOLLM noticed that the rtrmap and rtrefcount versions of these functions forget to account for the inode root, which means that we could access beyond the end of the cursor given a sufficiently large btree. Fix this.
Text from CVE List
Affected versions 8
- Linuxaffected: 9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 before 108114437915e61e8f88d1cbcc442c3f886a347eCVE List
- Linuxaffected: 9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 before 84316cb25af95a60e655ccc8fe646bb5ad631b71CVE List
- Linuxaffected: 9abe03a0e4f978615a2b1b484b8d09ca84c16ea0 before aa301322f72f82f26e4ba0826018d41388ab9896CVE List
- Linuxaffected: 6.14CVE List
- Linuxunaffected: all versions before 6.14CVE List
- Linuxunaffected: 6.18.53 through 6.18.*CVE List
- Linuxunaffected: 7.2.7 through 7.2.*CVE List
- Linuxunaffected: 7.3CVE List