Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-68148— fscrypt: Add missing superblock check in find_or_insert_direct_key()

AI Predicted 5.5 Difficulty: Hard EPSS 0.12% · P2

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux22e9947a4b2ba255888541bd0111cf00b9b16586< 330249609b70778094a7a36f5b6bcfa6362121d4affected
22e9947a4b2ba255888541bd0111cf00b9b16586< deff41898a5ae3a47db5fa1896a494aa95efda5daffected
22e9947a4b2ba255888541bd0111cf00b9b16586< 95376fe9c145be35566991df99c53134943d992faffected
22e9947a4b2ba255888541bd0111cf00b9b16586< 466f187b501a5ac8e1ea2ccf3ccd5c46108d8830affected
22e9947a4b2ba255888541bd0111cf00b9b16586< b5fa40226e71c17847b9ff2816c6ca4133d0d994affected
6.1affected
< 6.1unaffected
6.6.148≤ 6.6.*unaffected
… +4 more rows
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-68148

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
fscrypt: Add missing superblock check in find_or_insert_direct_key()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fscrypt: Add missing superblock check in find_or_insert_direct_key() The legacy 'fscrypt_direct_keys' table caches master keys that are used by v1 encryption policies that have FSCRYPT_POLICY_FLAG_DIRECT_KEY. It's just a global table for all filesystems (since the keys can be provided by the legacy process-subscribed keyrings mechanism, which makes it difficult to reuse super_block::s_master_keys). The entries in it ('struct fscrypt_direct_key') do contain a super_block pointer, though, for passing to fscrypt_destroy_inline_crypt_key() when the last inode that references the key is evicted. However, when finding the fscrypt_direct_key for an inode, we weren't actually comparing the super_block pointer. As a result, inodes with different super_blocks could point to the same fscrypt_direct_key. That could extend the lifetime of a fscrypt_direct_key beyond the super_block it points to, causing a use-after-free later. Fix this by creating distinct fscrypt_direct_key structs for distinct super_block structs. Note that this problem doesn't exist in the v2 policy equivalent ("per-mode keys"), since the data structures there are per super_block.
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
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find_or_insert_direct_key函数缺少superblock检查，可能导致释放后重用。
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 22e9947a4b2ba255888541bd0111cf00b9b16586 ~ 330249609b70778094a7a36f5b6bcfa6362121d4 -
LinuxLinux 6.1 -

II. Public POCs for CVE-2026-68148

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-68148

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-68148 (4)

Same Patch Batch · Linux · 2026-08-10 · 345 CVEs total

CVE-2026-68311wifi: mt76: mt7925: guard link STA in decap offload
CVE-2026-68321net: txgbe: fix FDIR filter leak on remove
CVE-2026-68320sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
CVE-2026-68319pds_core: fix deadlock between reset thread and remove
CVE-2026-68318pds_core: fix use-after-free on workqueue during remove
CVE-2026-68317pds_core: fix auxiliary device add/del races
CVE-2026-68316accel: ethosu: Fix element size accounting for cmd stream validation
CVE-2026-68315sctp: validate stream count in sctp_process_strreset_inreq()
CVE-2026-68314net: mctp i3c: clean up notifier and buses if driver register fails
CVE-2026-68313tipc: fix infinite loop in __tipc_nl_compat_dumpit
CVE-2026-68312cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths
CVE-2026-68306wifi: mt76: mt7996: fix possible NULL-pointer deref in mt7996_mcu_sta_bfer_eht()
CVE-2026-68301net: hsr: fix memory leak on slave unregistration by removing synced VLANs
CVE-2026-68302amt: re-read skb header pointers after every pull
CVE-2026-68303drm/vc4: hvs/v3d: Fix null dereference in unbind
CVE-2026-68304wifi: brcmfmac: fix 802.1X-SHA256 call trace warning
CVE-2026-68305drm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers
CVE-2026-68308wifi: mt76: mt7996: check pointer returned by mt76_connac_get_he_phy_cap()
CVE-2026-68310wifi: mt76: mt7915: guard HE capability lookups
CVE-2026-68309wifi: mt76: connac: fix possible NULL-pointer deref in mt76_connac_mcu_uni_bss_he_tlv()

Showing top 20 of 345 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68148

No comments yet

Leave a comment