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CVE-2026-97594— landlock: Fix use-after-free of the source's parent directory

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： landlock：修复源目录父级的 Use-After-Free（释放后使用）问题 在未持有引用（reference）也未加锁的情况下读取 ，随后在 和审计记录中解引用该指针。 子项（dentry）的引用并不会固定（pin）其父项： 会重新分配 ，并释放子项对其原父项持有的引用。 不受此影响，因为 rename 路径在调用钩子之前会调用 ，因此源项在该钩子执行期间不会被重新绑定（reparented）。然而， 缺乏此类保护： 虽然对源 dentry 持有引用，但既未对其父项

CVSS 7.8 · High EPSS 0.16% · P4

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux b91c3e4ea756b12b7d992529226edce1cfd854d7< 379efd2ce8b26fd35feb13ccc2f671ff105a5052 affected
b91c3e4ea756b12b7d992529226edce1cfd854d7< ba29c46ccfe3ebadfb8aa18149186c49f84b14f8 affected
b91c3e4ea756b12b7d992529226edce1cfd854d7< 2c6dc792538260a8087ac5b22c31b3b8e47c85d6 affected
5.19 affected
< 5.19 unaffected
6.18.53≤ 6.18.* unaffected
7.2.7≤ 7.2.* unaffected
7.3-rc3≤ * unaffected
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I. Basic Information for CVE-2026-97594

Vulnerability Information
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Vulnerability Title
landlock: Fix use-after-free of the source's parent directory
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: landlock: Fix use-after-free of the source's parent directory current_check_refer_path() reads old_dentry->d_parent without holding a reference nor a lock on it, and then dereferences it in collect_domain_accesses() and in the audit record. A reference on a child does not pin its parent: __d_move() reassigns dentry->d_parent and drops the reference the child held on its former parent. hook_path_rename() is not affected because the rename path calls lock_rename() before the hook, so the source cannot be reparented under it. hook_path_link() has no such protection: filename_linkat() holds a reference on the source dentry but neither locks nor references its parent, so a concurrent rename(2) can reparent the source while security_path_link() runs, and the former parent can then be removed and freed while the hook walks it. A process can trigger this after entering a Landlock domain that handles at least one filesystem access right. The process can then race a linkat(2) loop against rename(2) and rmdir(2): BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290 Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549 collect_domain_accesses+0x278/0x290 current_check_refer_path+0x952/0x1120 security_path_link+0x1be/0x320 filename_linkat+0x342/0x6d0 __x64_sys_linkat+0xfa/0x150 Freed by task 562: kmem_cache_free+0x139/0x4c0 i_callback+0x4b/0x80 rcu_core+0x7dc/0x10a0 Take a reference on the dentry selected as the source parent, using dget() for the common-mount-root case and dget_parent() otherwise. Release it after the hierarchy walk and synchronous audit logging. [mic: Clarify the caller, reachability, and reference handling]
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 b91c3e4ea756b12b7d992529226edce1cfd854d7 ~ 379efd2ce8b26fd35feb13ccc2f671ff105a5052 -
Linux Linux 5.19 -

II. Public POCs for CVE-2026-97594

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III. Intelligence Information for CVE-2026-97594

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Patches & Fixes for CVE-2026-97594 (3)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-97911 7.8 HIGH accel: ethosu: Ensure SRAM region size matches job
CVE-2026-98023 7.8 HIGH vxlan: reject dynamic fdb entries that reference a nexthop id
CVE-2026-97910 7.8 HIGH ASoC: sprd: validate compress buffer sizes against fixed allocations
CVE-2026-98143 7.8 HIGH accel: ethosu: Don't read the U65 rounding mode as a storage mode
CVE-2026-97903 7.8 HIGH exit: hold a reference to thread_pid across proc_flush_pid
CVE-2026-97548 7.8 HIGH xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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