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CVE-2026-68175— tracing: Fix resource leak on mmiotrace trace_pipe close

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 2.6.33版本存在安全漏洞，该漏洞源于mmiotrace跟踪器的pipe_close回调未正确设置，导致关闭trace_pipe时header_iter分配和pci_dev引用未被释放，可能造成资源泄漏。

AI Predicted 5.5 Difficulty: Easy EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1529 · System Shutdown/Reboot

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c521efd1700a8c0f7ce26f011f5eaecca17fabfa< 7871128ea41217fa6a58bbbcb44cb0d2e9e60966 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< 1d0b59e2b203c02149d8f63607329debe36b3ec5 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< 581ac13e12e77d6c64f8719083bdf95209308919 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< f9e6dfe341fb31c95b9655eb6b1db8b3ae090817 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< 594e1cf3f736779a535873fd5988162d827bfe4f affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< cf5a82bef623b969a609f2b7e392d06dbae34aa6 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< cb459fec4f7b13caf646101ff076e94ef38434d8 affected
c521efd1700a8c0f7ce26f011f5eaecca17fabfa< c1d87e724ae55e781b7cc7ccafb34d9e668582b2 affected
… +10 more rows
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I. Basic Information for CVE-2026-68175

Vulnerability Information
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Vulnerability Title
tracing: Fix resource leak on mmiotrace trace_pipe close
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix resource leak on mmiotrace trace_pipe close The mmiotrace tracer was added May 12th 2008. At that time, resources created in pipe_open() could not be freed because there was not pipe_close function pointer of the tracer. The pipe_close function pointer was added in December 7th, 2009, but the mmiotrace tracer was not updated. mmio_pipe_open() allocates a header_iter and takes a pci_dev reference when trace_pipe is opened. mmio_close() frees them, but it was only wired to the tracer's .close callback. tracing_release_pipe() invokes .pipe_close, not .close, when the trace_pipe file is released. As a result, closing trace_pipe with the mmiotrace tracer active leaked the header_iter allocation and left a stale pci_dev reference. Set .pipe_close to mmio_close, matching how function_graph wires both callbacks to the same handler. Note, if the trace_pipe is read to completion, it will clean up the resources, but if one were to run: # head -n 1 /sys/kernel/tracing/trace_pipe VERSION 20070824 Over and over again, it would trigger a massive leak.
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 2.6.33版本存在安全漏洞，该漏洞源于mmiotrace跟踪器的pipe_close回调未正确设置，导致关闭trace_pipe时header_iter分配和pci_dev引用未被释放，可能造成资源泄漏。
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 c521efd1700a8c0f7ce26f011f5eaecca17fabfa ~ 7871128ea41217fa6a58bbbcb44cb0d2e9e60966 -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-68175

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III. Intelligence Information for CVE-2026-68175

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Patches & Fixes for CVE-2026-68175 (7)

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

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