CVE-2026-89965

CVE CVE-2026-89965EUVD EUVD-2026-80565Published 2026-09-16T10:32:46.000ZLast changed 2026-09-16T14:40:43.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.3-rc1; patch: 6.1.188; 4.2; patch: 7.2.5; 5212e11fde4d40fa627668b4f2222d20db488f71 <6f79d1a5f2611a3d36e9312be5425cd9cb397c51; patch: 0; 5212e11fde4d40fa627668b4f2222d20db488f71 <9dfa11cef4750b67591307f2c62e47a23d60e4b7; 5212e11fde4d40fa627668b4f2222d20db488f71 <f6c5313aae794ecca8f762c1a3493de5c266f120; patch: 5.10.270; patch: 6.6.157; patch: 5.15.221; 5212e11fde4d40fa627668b4f2222d20db488f71 <f9bf05c63b77d000e9c01f3e47af36973887d350; 5212e11fde4d40fa627668b4f2222d20db488f71 <6a1f2e5ed9267ca19187038ac635393c165213ac; patch: 6.12.110; 5212e11fde4d40fa627668b4f2222d20db488f71 <eb491343d2d1784121ad9af91c25b338c28913c3; 5212e11fde4d40fa627668b4f2222d20db488f71 <59d5cd1f42b4bab3609512c3cb3d3540d3d21da7; 5212e11fde4d40fa627668b4f2222d20db488f71 <6b1faf1f099f7060b5f1f2f0d024132581f1726e; patch: 6.18.51

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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