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CVE-2026-74595— fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()

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 5.12版本存在安全漏洞，该漏洞源于fscrypt_ioctl_set_policy()函数在设置加密策略时错误地使用挂载idmap进行所有者检查，可能导致实际所有者被错误拒绝或无关调用者被错误允许。

CVSS 7.8 · High EPSS 0.09% · P0

Possible ATT&CK Techniques 1 AI

T1548.001 · Setuid and Setgid

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 14f3db5542e62bcf6fe088a09760ac52d55306c5< 174633a468817a49bd474bcfc9067c84e54efe68 affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< 0baeb730044981f5ec5fb7d62a3763835ea606f6 affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< 33b7e810ce09955aa02f3b632455cf5e7ac990a9 affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< 6a67c460b12315033268dce597546984fe5739e7 affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< 653e888a24c87b8bbeab44d7e558a1c1a3641088 affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< 98516ba8b817f34e86bdd7a5b7a383cff75c3ddf affected
14f3db5542e62bcf6fe088a09760ac52d55306c5< cf6c993c0feca7984797e634deba3c80342e199a affected
5.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-74595

Vulnerability Information
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Vulnerability Title
fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy() fscrypt_ioctl_set_policy() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing an encryption policy to be set, instead of the idmap of the mount the ioctl was issued on. fscrypt is used by filesystems that support idmapped mounts (e.g. ext4, f2fs), so on such a mount this compares the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EACCES and an unrelated caller wrongly allowed. Use file_mnt_idmap(filp) instead.
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基金会开源的一个操作系统内核。 Linux kernel 5.12版本存在安全漏洞，该漏洞源于fscrypt_ioctl_set_policy()函数在设置加密策略时错误地使用挂载idmap进行所有者检查，可能导致实际所有者被错误拒绝或无关调用者被错误允许。
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 14f3db5542e62bcf6fe088a09760ac52d55306c5 ~ 174633a468817a49bd474bcfc9067c84e54efe68 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-74595

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III. Intelligence Information for CVE-2026-74595

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Patches & Fixes for CVE-2026-74595 (6)

Same Patch Batch · Linux · 2026-08-22 · 149 CVEs total

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74595

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