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CVE-2026-74365— nvdimm/btt: Handle preemption in BTT lane acquisition

CVSS 7.3 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 26

VendorProductVersion RangeStatus
LinuxLinuxf23859748e3d530217b197e146a9ac84faf0a282< fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735affected
6f50b414f1a0d790f11a6438a3ad6d0577eb2c18< 73e35c1bdfa160b41fdbe204e02325f0687de506affected
36c75ce3bd299878fd9b238e9803d3817ddafbf3< 417918783bcfe0be135019df16a267b3af442efdaffected
36c75ce3bd299878fd9b238e9803d3817ddafbf3< 5c53406098b599c420b031e6ec5ba8a2f3794c50affected
36c75ce3bd299878fd9b238e9803d3817ddafbf3< 4eafa810b042d985ec6bbf5b514414e73cee6f6faffected
36c75ce3bd299878fd9b238e9803d3817ddafbf3< 8d4b989d9c9afe5f185aa5853b666fc4617afe9eaffected
2577fece583c7c05cda7ad50dde7638c962665e1affected
40ba3fa21250e361bdd8f00800b3e2cb6160de95affected
… +18 more rows
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I. Basic Information for CVE-2026-74365

Vulnerability Information
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Vulnerability Title
nvdimm/btt: Handle preemption in BTT lane acquisition
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: Handle preemption in BTT lane acquisition BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test reports data mismatches during BTT writes due to a race in lane acquisition that can lead to silent data corruption. The existing lane model uses a spinlock together with a per-CPU recursion count. That recursion model stopped being valid after BTT lanes became preemptible: another task can run on the same CPU, observe a non-zero recursion count, bypass locking, and use the same lane concurrently. BTT lanes are also held across arena_write_bytes() calls. That path reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush(). Some provider flush callbacks can sleep, making a spinlock the wrong primitive for the lane lifetime. Replace the spinlock-based recursion model with a dynamically allocated per-lane mutex array and take the lane lock unconditionally. Add might_sleep() to catch any future atomic-context caller. Found with the ndctl unit test btt-check.sh.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于BTT lane获取存在竞争条件，自旋锁与每CPU递归计数模型在lane可抢占后失效，可能导致其他任务在同一CPU上绕过锁定并发使用同一lane，造成静默数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux f23859748e3d530217b197e146a9ac84faf0a282 ~ fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735 -
LinuxLinux 6.7 -

II. Public POCs for CVE-2026-74365

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III. Intelligence Information for CVE-2026-74365

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Patches & Fixes for CVE-2026-74365 (5)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-722349.8 CRITICALbatman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-723399.8 CRITICALqede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-742559.8 CRITICALtipc: fix UAF in tipc_l2_send_msg()
CVE-2026-720649.8 CRITICALnet: mana: Sync page pool RX frags for CPU
CVE-2026-720659.8 CRITICALnet: mana: Validate the packet length reported by the NIC
CVE-2026-722179.8 CRITICALSUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-744739.8 CRITICALvxlan: use pskb_network_may_pull() in route_shortcircuit()
CVE-2026-723239.8 CRITICALipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-744959.8 CRITICALigbvf: Fix leak in TX DMA error cleanup
CVE-2026-724639.8 CRITICALxfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-720699.8 CRITICALlocking/rt: Fix the incorrect RCU protection in rt_spin_unlock()

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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