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CVE-2026-72033— orangefs: keep the readdir entry size 64-bit in fill_from_part()

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 4.12版本存在安全漏洞，该漏洞源于fill_from_part()函数将目录项大小以size_t计算但存储为__u32，导致长度接近U32_MAX时回绕成小值，绕过边界检查，造成越界读取，可能导致内核崩溃。

CVSS 9.8 · Critical EPSS 0.74% · P51

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 480e3e532e31666a18520a7964bb4095d7a16b9a< 1679780f482feeb82acb5995587d4fb1d1fe82fd affected
480e3e532e31666a18520a7964bb4095d7a16b9a< a72bbb43689591c9d36e3bb45c2d4e688cf92682 affected
480e3e532e31666a18520a7964bb4095d7a16b9a< 36723b28e3293047f087f4501f1ef4ead418dd84 affected
480e3e532e31666a18520a7964bb4095d7a16b9a< 07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9 affected
480e3e532e31666a18520a7964bb4095d7a16b9a< fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1 affected
480e3e532e31666a18520a7964bb4095d7a16b9a< 82fc886e244c76fadf05ef1958aaf8815478ccde affected
480e3e532e31666a18520a7964bb4095d7a16b9a< e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729 affected
480e3e532e31666a18520a7964bb4095d7a16b9a< 18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc affected
… +10 more rows
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I. Basic Information for CVE-2026-72033

Vulnerability Information
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Vulnerability Title
orangefs: keep the readdir entry size 64-bit in fill_from_part()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: orangefs: keep the readdir entry size 64-bit in fill_from_part() fill_from_part() computes the size of a directory entry in size_t but stores it in a __u32. An entry length near U32_MAX wraps it to a small value, bypasses the bounds check, and is then used to index the entry, reading far past the directory part -- an out-of-bounds read that oopses the kernel. Compute the size as a u64 so it cannot truncate; the bounds check then rejects the entry. The trailer is supplied by the userspace client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
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 4.12版本存在安全漏洞，该漏洞源于fill_from_part()函数将目录项大小以size_t计算但存储为__u32，导致长度接近U32_MAX时回绕成小值，绕过边界检查，造成越界读取，可能导致内核崩溃。
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 480e3e532e31666a18520a7964bb4095d7a16b9a ~ 1679780f482feeb82acb5995587d4fb1d1fe82fd -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-72033

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III. Intelligence Information for CVE-2026-72033

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Patches & Fixes for CVE-2026-72033 (5)

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

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-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72442 9.8 CRITICAL netfilter: flowtable: fix and simplify IP6IP6 tunnel handling
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion

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-2026-72033

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