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CVE-2026-74349— ocfs2: reject FITRIM ranges shorter than a cluster

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.

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ocfs2文件系统对FITRIM范围的长度验证不足，仅检查块大小而未检查集群大小，可能导致算术下溢，触发修剪操作越过请求范围，造成文件系统数据损坏或意外删除。

CVSS 7.1 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux aa89762c54800208d5afdcd8e6bf124818f17fe0< d903d59c0315f59bdf0214b4f13d71c9feb2c45c affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< 441abb77222f155e8d931dbabb465466db01cfd7 affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< e652d0f5108e447b22da4249bcd23dd1b63c73dd affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< 346314bb0cc2fc52b50b73d6ecc62e0217455c2e affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< 06c0a0431b9856506fcd9b2c1b0c6136567d756d affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< 3fa7139b5f42731a61f78c42433adae13f9adc21 affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< 2c13e02592b918be7725ab5965e01ef4e46c4b57 affected
aa89762c54800208d5afdcd8e6bf124818f17fe0< ca1afd88f5eaaff9168e1466e5401385edf59543 affected
… +10 more rows
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I. Basic Information for CVE-2026-74349

Vulnerability Information
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Vulnerability Title
ocfs2: reject FITRIM ranges shorter than a cluster
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject FITRIM ranges shorter than a cluster ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its too-short range validation only checks sb->s_blocksize. On filesystems with a cluster size larger than the block size, a FITRIM range that is at least one block but shorter than one cluster is accepted and shifted down to len == 0. The later start + len - 1 and len -= ... arithmetic then underflows and can drive trimming past the requested range. Reject ranges shorter than s_clustersize instead. That preserves the existing -EINVAL behavior for requests that cannot discard even one allocation unit and keeps zero-cluster trims out of the group walk.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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ocfs2文件系统对FITRIM范围的长度验证不足，仅检查块大小而未检查集群大小，可能导致算术下溢，触发修剪操作越过请求范围，造成文件系统数据损坏或意外删除。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux aa89762c54800208d5afdcd8e6bf124818f17fe0 ~ d903d59c0315f59bdf0214b4f13d71c9feb2c45c -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-74349

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III. Intelligence Information for CVE-2026-74349

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Patches & Fixes for CVE-2026-74349 (7)

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

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74473 9.8 CRITICAL vxlan: use pskb_network_may_pull() in route_shortcircuit()
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/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

V. Comments for CVE-2026-74349

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