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CVE-2026-68176— tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev

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存在安全漏洞，该漏洞源于mmio_pipe_open()函数未找到PCI设备时hiter->dev被赋值为NULL，mmiotrace read()函数解引用该空指针，可能导致空指针取消引用。

AI Predicted 4.4 Difficulty: Easy EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f984b51e0779a6dd30feedc41404013ca54e5d05< c06470320f8156306986a831010cdc9f9f87cb50 affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 0d5aaf91a3d05f7f993401af27872a5fc0f26edc affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 3635a9e8b453e658a49b39d025f35bbc6e58d0e2 affected
f984b51e0779a6dd30feedc41404013ca54e5d05< faaf95135184208ee3ac6f33175c8d1800669dfc affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 201a01102c529772168181190cb084471082cf5c affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 8464427e1c177809a9488a97dfa2807d9dcf323b affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 724cd84b0546c07806840fa658714488553d13a2 affected
f984b51e0779a6dd30feedc41404013ca54e5d05< 144f29e85702234b23d2a62abf723e6a17eb5427 affected
… +10 more rows
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I. Basic Information for CVE-2026-68176

Vulnerability Information
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Vulnerability Title
tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev If the mmio_pipe_open() fails to find a PCI device, the hiter->dev will be assigned to NULL. The mmiotrace read() function dereferences the hiter->dev if hiter exists. Change the test of the read to not only check hiter being NULL, but also the hiter->dev before dereferencing it.
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
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存在安全漏洞，该漏洞源于mmio_pipe_open()函数未找到PCI设备时hiter->dev被赋值为NULL，mmiotrace read()函数解引用该空指针，可能导致空指针取消引用。
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 f984b51e0779a6dd30feedc41404013ca54e5d05 ~ c06470320f8156306986a831010cdc9f9f87cb50 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-68176

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III. Intelligence Information for CVE-2026-68176

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Patches & Fixes for CVE-2026-68176 (8)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68176

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