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CVE-2026-89723— nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation

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，以下漏洞已得到修复： nilfs2：修复截断操作后在 中出现的 slab 越界访问问题 Shuangpeng Bai 报告称，在测试过程中，KASAN 检测到 函数中存在 slab 越界错误。 分析表明，在文件被截断后，位于 B 树根节点正下方的一个节点块未被删除，而是以“脏（dirty）”状态残留在 B 树节点缓存中。随后，日志写入器（log writer）检测到该块，并错误地对其调用了 。该函数原本仅设计用于处理直接映射（direct mapping）中的数据块。 缓存中的 B 树节点通

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1574 · Hijack Execution Flow

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 36a580eb489f54d81a0534974962e732a314b999< 5d3783c451a546373662ee11ec17019273e68034 affected
36a580eb489f54d81a0534974962e732a314b999< 448636c745a3f3b8582a0b8ce718c890a11c0fa9 affected
36a580eb489f54d81a0534974962e732a314b999< 28362e8ce51377afdec1782e661e808328a10514 affected
36a580eb489f54d81a0534974962e732a314b999< 45662dedb8f272ef7f16e69f13424c4bd0399240 affected
2.6.30 affected
< 2.6.30 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89723

Vulnerability Information
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Vulnerability Title
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 36a580eb489f54d81a0534974962e732a314b999 ~ 5d3783c451a546373662ee11ec17019273e68034 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-89723

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III. Intelligence Information for CVE-2026-89723

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Patches & Fixes for CVE-2026-89723 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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