CVE-2026-93206— PCI/proc: Use file_ns_capable() when checking config space read access
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： PCI/proc：在检查配置空间读访问权限时使用 根据 的结果来决定可读取的配置空间范围。该检查验证的是调用 的系统任务（task）的凭据（credentials），而非打开该文件的进程的凭据。 而 sysfs 中的等效函数 自提交 （“pci：从 sysfs 文件打开时检查配置空间的权限，以读取设备相关的配置空间”）起，已开始检查打开文件的进程的凭据。因此，特权进程可以打开配置空间文件，并将文件描述符传递给非特权进程（例如，运行具有分配设备的 KVM 来宾的进程），从而使
Possible ATT&CK Techniques 1 AI
T1528 · Steal Application Access TokenAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8a3a54aa3e65ed76f8560a387243a7738ae0cb1c |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5c7ab4ca66f0880cffc3735555ea719dd5253726 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 53407535d49ec034e476121020b5c878f0d92e18 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e7730acd6a01c5931a3afb83639810ff2fb9cc92 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 77272b7fd0e472086fd626a1fcd11da625822cc2 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c2d4174f492458ecdcdef309243624999612d526 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6351e94076329dab517ea94c115e15c4d8459381 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f82f53e75eff382fc8f56b73279b54f7cf5a5c65 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-93206
Vulnerability Information
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Vulnerability Title
PCI/proc: Use file_ns_capable() when checking config space read access
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
PCI/proc: Use file_ns_capable() when checking config space read access
proc_bus_pci_read() decides how much of the config space is readable based
on capable(CAP_SYS_ADMIN), which checks the credentials of the task calling
read(), not the credentials of the process that opened the file.
The sysfs equivalent, pci_read_config(), has checked the credentials of the
opening process since commit de139a339395 ("pci: check caps from sysfs file
open to read device dependent config space"), so a privileged process can
open the config space file and pass the file descriptor to an unprivileged
process (for example, a process running a KVM guest with an assigned
device), which can then read the entire config space. The check was
subsequently routed through the LSM framework in commit 47970b1b2aa6 ("pci:
use security_capable() when checking capablities during config space read")
and converted to the dedicated helper in commit ab0fa82b2df9 ("pci-sysfs:
use proper file capability helper function").
Thus, the two interfaces check the same capability against different
credentials. Checking the credentials of the task calling read() makes the
outcome depend on who reads rather than who opened, so the restriction is
bypassed whenever a more privileged process reads through the descriptor.
Checking the credentials recorded in file->f_cred settles the decision at
open() time and ties it to the file, where it cannot change with the
caller.
Use file_ns_capable() to check CAP_SYS_ADMIN against the credentials in
effect when the file was opened, bringing the procfs interface in line with
the sysfs behaviour.
As a result, a file descriptor opened by a privileged process and passed to
an unprivileged one now allows the entire config space to be read through
procfs, matching sysfs.
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-2026-93206
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-93206 (7)
Other References for CVE-2026-93206 (1)
Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry |
| CVE-2026-97413 | 9.8 CRITICAL | RDMA/rtrs-srv: Fix integer underflow in process_read and process_write |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma: Reject Write/Reply chunks with segcount 0 |
| CVE-2026-93793 | 8.8 HIGH | wifi: iwlwifi: mvm: validate TX_CMD response layout |
| CVE-2026-93799 | 8.8 HIGH | wifi: iwlwifi: mvm: validate sta_id in BA window status notif |
| CVE-2026-93790 | 8.8 HIGH | wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211: validate assoc response length before status and IE access |
| CVE-2026-97442 | 8.8 HIGH | wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi |
| CVE-2026-97409 | 8.8 HIGH | nvme-fc: Do not cancel requests in io target before it is initialized |
| CVE-2026-97509 | 8.8 HIGH | thunderbolt: Keep XDomain reference during the lifetime of a service |
| CVE-2026-93280 | 8.8 HIGH | greybus: audio: bound the topology section sizes against the fetched size |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap: dma-unmap pages before handling migration errors |
| CVE-2026-97451 | 8.4 HIGH | ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op) |
| CVE-2026-97452 | 8.4 HIGH | ACPICA: Prevent adding invalid references |
| CVE-2026-97455 | 8.4 HIGH | ACPICA: Fix use-after-free in acpi_ds_terminate_control_method() |
| CVE-2026-97450 | 8.4 HIGH | ACPICA: validate handler object type in two places |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs: avoid double-free on failed queue setup |
| CVE-2026-97433 | 8.2 HIGH | nvme: validate FDP configuration descriptor sizes |
| CVE-2026-93787 | 8.1 HIGH | smb: client: bound dirent name against end of SMB response in cifs_filldir |
| CVE-2026-93224 | 8.1 HIGH | svcrdma: Fix unmatched rn_unregister on failed accept |
Showing top 20 of 234 CVEs. View all on vendor page → →
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Same vendor: Linux
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V. Comments for CVE-2026-93206
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