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CVE-2026-43106— cachefiles: fix incorrect dentry refcount in cachefiles_cull()

CVSS 7.8 · High EPSS 0.11% · P2

Possible ATT&CK Techniques 1AI

T1056 · Input Capture

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinux7bb1eb45e43c4730cbc5a48b9e9295049fccdacb< 6577df7dc7a7de128442b6192c7a32195c923480affected
7bb1eb45e43c4730cbc5a48b9e9295049fccdacb< 1635c2acdde86c4f555b627aec873c8677c421edaffected
6.19affected
< 6.19unaffected
6.19.14≤ 6.19.*unaffected
7.0≤ *unaffected
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I. Basic Information for CVE-2026-43106

Vulnerability Information
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Vulnerability Title
cachefiles: fix incorrect dentry refcount in cachefiles_cull()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix incorrect dentry refcount in cachefiles_cull() The patch mentioned below changed cachefiles_bury_object() to expect 2 references to the 'rep' dentry. Three of the callers were changed to use start_removing_dentry() which takes an extra reference so in those cases the call gets the expected references. However there is another call to cachefiles_bury_object() in cachefiles_cull() which did not need to be changed to use start_removing_dentry() and so was not properly considered. It still passed the dentry with just one reference so the net result is that a reference is lost. To meet the expectations of cachefiles_bury_object(), cachefiles_cull() must take an extra reference before the call. It will be dropped by cachefiles_bury_object().
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cachefiles_cull函数未正确获取dentry引用计数，导致引用丢失。
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 7bb1eb45e43c4730cbc5a48b9e9295049fccdacb ~ 6577df7dc7a7de128442b6192c7a32195c923480 -
LinuxLinux 6.19 -

II. Public POCs for CVE-2026-43106

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III. Intelligence Information for CVE-2026-43106

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Patches & Fixes for CVE-2026-43106 (2)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-431859.8 CRITICALksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-431869.8 CRITICALipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-432089.8 CRITICALnet: do not pass flow_id to set_rps_cpu()
CVE-2026-431989.8 CRITICALtcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-431259.8 CRITICALdlm: validate length in dlm_search_rsb_tree
CVE-2026-431149.4 CRITICALnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-431179.1 CRITICALbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-430839.1 CRITICALnet: ioam6: fix OOB and missing lock
CVE-2026-431979.1 CRITICALnetconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-432328.8 HIGHnet: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-431128.8 HIGHfs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-431138.8 HIGHwifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-431108.8 HIGHwifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-431878.8 HIGHxfs: delete attr leaf freemap entries when empty
CVE-2026-432158.8 HIGHcifs: Fix locking usage for tcon fields
CVE-2026-431768.8 HIGHwifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-432838.8 HIGHnet: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-432398.8 HIGHsmb: client: prevent races in ->query_interfaces()
CVE-2026-431728.8 HIGHwifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-431588.8 HIGHxfs: fix freemap adjustments when adding xattrs to leaf blocks

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43106

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