CVE-2026-97554— smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()
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，已修复以下漏洞： smb: 客户端：避免在 cifs_posix_to_fattr() 中使用未初始化的 SID cifs_posix_to_fattr() 函数忽略了 posix_info_parse() 的返回值。当遇到格式错误的 POSIX 目录项（例如，来自不受信任服务器的无效 SID 长度）时，posix_info_parse() 返回 -1，但不会填充 “parsed” 结构体。此时，parsed.owner 和 parsed.group 中的未初始化栈内存会被传递给 sid_t
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1005 · Data from Local SystemAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 9934430e2178d5164eb1ac91a9b092f9e7e64745< c9a8b60ce140a68d172452f418137fc7ddbae7db |
affected |
9934430e2178d5164eb1ac91a9b092f9e7e64745< da6e25842431982d5a53cf00d925b98c690f4467 |
affected | ||
dd80b98bdf0a4b3206739f3513b0518f27a7b4ef |
affected | ||
d8e39c11f66125f49de55537a6efc8ecadf4a0f7 |
affected | ||
5.8.17< 5.9 |
affected | ||
5.9.2< 5.10 |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-97554
Vulnerability Information
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Vulnerability Title
smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()
cifs_posix_to_fattr() ignores the return value of posix_info_parse().
When a malformed POSIX directory entry is encountered (e.g. invalid
SID lengths from an untrusted server), posix_info_parse() returns -1
without populating the 'parsed' struct. The uninitialized stack
memory in parsed.owner and parsed.group is then passed to
sid_to_id(), which processes the garbage bytes and passes them to
request_key() to construct a SID string, potentially leaking kernel
stack contents to the userspace idmap daemon.
Fix this by checking the return value and skipping the SID-to-id
mapping when parsing fails. The remaining fattr fields (timestamps,
mode, etc.) are populated directly from the 'info' pointer so they
are unaffected.
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-2026-97554
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-97554 (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
Same product: Linux
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CVE-2026-98384
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CVE-2026-98381
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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-2026-97554
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