CVE-2026-97561— smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
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：在将 SID 映射为 uid/gid 时，遵循 forceuid/forcegid 设置 当管理员使用 或 （即挂载选项中的 / ）进行挂载时，他们期望所有文件都显示为指定用户/组所有。然而，由于几条代码路径无条件地调用 ，用服务器提供的值覆盖 / ，从而忽略了管理员的明确覆盖设置： （通过 POSIX 扩展进行 stat 操作） （通过 POSIX 扩展进行 readdir 操作） （CIFS ACL 所有权映射） 这导致不受信任的服务器即使在挂载配置
Affected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 9409ae58e0759d010b347e7b19ebc90ab5d4b98f< e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 |
affected |
9409ae58e0759d010b347e7b19ebc90ab5d4b98f< 18a72975e9f35aadecc75b031f693f2d1f49308f |
affected | ||
3.0 |
affected | ||
< 3.0 |
unaffected | ||
7.2.7≤ 7.2.* |
unaffected | ||
7.3-rc3≤ * |
unaffected |
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I. Basic Information for CVE-2026-97561
Vulnerability Information
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Vulnerability Title
smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
When the administrator mounts with forceuid or forcegid (uid=/gid=
mount options), they expect all files to appear owned by the specified
user/group. However, several code paths unconditionally called
sid_to_id() to overwrite cf_uid/cf_gid with server-provided values,
ignoring the administrator's explicit override:
- smb311_posix_info_to_fattr() (stat via POSIX extensions)
- cifs_posix_to_fattr() (readdir via POSIX extensions)
- parse_sec_desc() (CIFS ACL ownership mapping)
This allowed an untrusted server to dictate local file ownership even
when the mount was configured to force specific uid/gid values.
Fix all three call sites to check CIFS_MOUNT_OVERR_UID and
CIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the
same pattern already used by cifs_unix_basic_to_fattr() for unix
extensions.
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
II. Public POCs for CVE-2026-97561
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-97561 (2)
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 → →
IV. Related Vulnerabilities
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-97561
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