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CVE-2025-38477— net/sched: sch_qfq: Fix race condition on qfq_aggregate

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于qfq_aggregate竞争条件，可能导致空指针取消引用或释放后重用。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 462dbc9101acd38e92eda93c0726857517a24bbd< aa7a22c4d678bf649fd3a1d27debec583563414d affected
462dbc9101acd38e92eda93c0726857517a24bbd< d841aa5518508ab195b6781ad0d73ee378d713dd affected
462dbc9101acd38e92eda93c0726857517a24bbd< c6df794000147a3a02f79984aada4ce83f8d0a1e affected
462dbc9101acd38e92eda93c0726857517a24bbd< 466e10194ab81caa2ee6a332d33ba16bcceeeba6 affected
462dbc9101acd38e92eda93c0726857517a24bbd< fbe48f06e64134dfeafa89ad23387f66ebca3527 affected
462dbc9101acd38e92eda93c0726857517a24bbd< a6d735100f602c830c16d69fb6d780eebd8c9ae1 affected
462dbc9101acd38e92eda93c0726857517a24bbd< c000a3a330d97f6c073ace5aa5faf94b9adb4b79 affected
462dbc9101acd38e92eda93c0726857517a24bbd< 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 affected
… +10 more rows
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I. Basic Information for CVE-2025-38477

Vulnerability Information
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Vulnerability Title
net/sched: sch_qfq: Fix race condition on qfq_aggregate
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于qfq_aggregate竞争条件，可能导致空指针取消引用或释放后重用。
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 462dbc9101acd38e92eda93c0726857517a24bbd ~ aa7a22c4d678bf649fd3a1d27debec583563414d -
Linux Linux 3.8 -

II. Public POCs for CVE-2025-38477

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III. Intelligence Information for CVE-2025-38477

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Patches & Fixes for CVE-2025-38477 (1)

Same Patch Batch · Linux · 2025-07-28 · 29 CVEs total

CVE-2025-38488 9.8 CRITICAL smb: client: fix use-after-free in crypt_message when using async crypto
CVE-2025-38490 9.8 CRITICAL net: libwx: remove duplicate page_pool_put_full_page()
CVE-2025-38471 9.8 CRITICAL tls: always refresh the queue when reading sock
CVE-2025-38472 9.8 CRITICAL netfilter: nf_conntrack: fix crash due to removal of uninitialised entry
CVE-2025-38476 9.8 CRITICAL rpl: Fix use-after-free in rpl_do_srh_inline().
CVE-2025-38495 8.8 HIGH HID: core: ensure the allocated report buffer can contain the reserved report ID
CVE-2025-38491 8.2 HIGH mptcp: make fallback action and fallback decision atomic
CVE-2025-38478 7.8 HIGH comedi: Fix initialization of data for instructions that write to subdevice
CVE-2025-38485 7.8 HIGH iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush
CVE-2025-38486 7.8 HIGH soundwire: Revert "soundwire: qcom: Add set_channel_map api support"
CVE-2025-38484 7.8 HIGH iio: backend: fix out-of-bound write
CVE-2025-38494 7.8 HIGH HID: core: do not bypass hid_hw_raw_request
CVE-2025-38475 7.8 HIGH smc: Fix various oops due to inet_sock type confusion.
CVE-2025-38470 7.8 HIGH net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime
CVE-2025-38493 tracing/osnoise: Fix crash in timerlat_dump_stack()
CVE-2025-38492 netfs: Fix race between cache write completion and ALL_QUEUED being set
CVE-2025-38497 usb: gadget: configfs: Fix OOB read on empty string write
CVE-2025-38496 dm-bufio: fix sched in atomic context
CVE-2025-38468 net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree
CVE-2025-38489 s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38477

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