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CVE-2026-97564— smb: client: reject userspace cifs.idmap descriptions

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： smb: 客户端：拒绝来自用户空间的 cifs.idmap 密钥描述 cifs.idmap 密钥描述中包含具有权限属性的字段（如拥有者和组 SID，以及以 "os:"/"gs:"/"oi:"/"gi:" 形式表示的 uid/gid 值），这些字段由 cifs.idmap 的 upcall 助手视为来自内核的输入。与其姐妹类型 cifs.spnego 不同，cifs.idmap 密钥类型没有 vet_description 钩子，因此用户空间可以通过 request_ke

AI Predicted 7.8 Difficulty: Easy EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1548.003 · Sudo and Sudo Caching

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 4d79dba0e00749fa40de8ef13a9b85ce57a1603b< f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a affected
4d79dba0e00749fa40de8ef13a9b85ce57a1603b< 17c93bcd17755523c21abb22cbf2a41a6eb0caaf affected
4d79dba0e00749fa40de8ef13a9b85ce57a1603b< e5964064e3fbe6325893408faff08ca33de0e2c3 affected
4d79dba0e00749fa40de8ef13a9b85ce57a1603b< 96751028c0d4dec785709ea3eb0ab38a4f2ded96 affected
4d79dba0e00749fa40de8ef13a9b85ce57a1603b< 1d3b24b16a0b013792e8f1e3ed060f0b46f537d1 affected
4d79dba0e00749fa40de8ef13a9b85ce57a1603b< d9d7eeb0cea5b55b82888f443622fd8d4ee064f3 affected
3.0 affected
< 3.0 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-97564

Vulnerability Information
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Vulnerability Title
smb: client: reject userspace cifs.idmap descriptions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.idmap descriptions cifs.idmap key descriptions carry authority-bearing fields (owner and group SIDs and uid/gid values in "os:"/"gs:"/"oi:"/"gi:" form) that the cifs.idmap upcall helper treats as kernel-originating inputs. Unlike its sibling cifs.spnego, the cifs.idmap key type has no vet_description hook, so userspace can create keys of this type through request_key(2)/add_key(2) and supply those fields without CIFS origin. A request_key(2) call with a non-NULL callout then drives a root usermodehelper upcall (/sbin/request-key -> cifs.idmap) that consumes the unvetted description in root context. Only accept cifs.idmap descriptions while CIFS is using its private root_cred to request the key. id_to_sid()/sid_to_id() already run under override_creds(root_cred), so the kernel-originated path is unaffected. This mirrors commit 3da1fdf4efbc ("smb: client: reject userspace cifs.spnego descriptions"), which applied the same restriction to cifs.spnego.
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 4d79dba0e00749fa40de8ef13a9b85ce57a1603b ~ f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a -
Linux Linux 3.0 -

II. Public POCs for CVE-2026-97564

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III. Intelligence Information for CVE-2026-97564

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Patches & Fixes for CVE-2026-97564 (6)

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-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
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-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
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-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-97602 7.8 HIGH inet: frags: invalidate queues before flushing them
CVE-2026-97577 7.8 HIGH media: verisilicon: rockchip: reject AV1 frames exceeding the tile capacity

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97564

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