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CVE-2026-89965— nvdimm/btt: reject an arena whose nfree is below the lane count

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： nvdimm/btt：拒绝 nfree 小于通道数（lane count）的 arena BTT 信息块中的 字段（即预留空闲块数量）从存储介质读取时未进行校验。 和 根据 来确定每个通道的 和 数组大小，但 I/O 路径是通过 返回的通道号来索引这些数组，而该通道号的上限是 （即 ），而非 。 如果某个经过构造或非本系统的 arena 的 小于通道数，那么 / 的索引就会超出已分配的内存范围，导致越界写入（out-of-bounds write）。 中记录了不变量 ，但当

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1611 · Escape to Host

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5212e11fde4d40fa627668b4f2222d20db488f71< eb491343d2d1784121ad9af91c25b338c28913c3 affected
5212e11fde4d40fa627668b4f2222d20db488f71< 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7 affected
5212e11fde4d40fa627668b4f2222d20db488f71< f6c5313aae794ecca8f762c1a3493de5c266f120 affected
5212e11fde4d40fa627668b4f2222d20db488f71< f9bf05c63b77d000e9c01f3e47af36973887d350 affected
5212e11fde4d40fa627668b4f2222d20db488f71< 6f79d1a5f2611a3d36e9312be5425cd9cb397c51 affected
5212e11fde4d40fa627668b4f2222d20db488f71< 6b1faf1f099f7060b5f1f2f0d024132581f1726e affected
5212e11fde4d40fa627668b4f2222d20db488f71< 9dfa11cef4750b67591307f2c62e47a23d60e4b7 affected
5212e11fde4d40fa627668b4f2222d20db488f71< 6a1f2e5ed9267ca19187038ac635393c165213ac affected
… +10 more rows
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I. Basic Information for CVE-2026-89965

Vulnerability Information
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Vulnerability Title
nvdimm/btt: reject an arena whose nfree is below the lane count
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5212e11fde4d40fa627668b4f2222d20db488f71 ~ eb491343d2d1784121ad9af91c25b338c28913c3 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-89965

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III. Intelligence Information for CVE-2026-89965

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Other References for CVE-2026-89965 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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