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CVE-2025-38115— net_sched: sch_sfq: fix a potential crash on gso_skb handling

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sch_sfq队列处理不当，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a53851e2c3218aa30b77abd6e68cf1c371f15afe< c337efb20d6d9f9bbb4746f6b119917af5c886dc affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< b44f791f27b14c9eb6b907fbe51f2ba8bec32085 affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< 5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72 affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< 9c19498bdd7cb9d854bd3c54260f71cf7408495e affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< b4e9bab6011b9559b7c157b16b91ae46d4d8c533 affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< d1bc80da75c789f2f6830df89d91fb2f7a509943 affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< 82448d4dcd8406dec688632a405fdcf7f170ec69 affected
a53851e2c3218aa30b77abd6e68cf1c371f15afe< 82ffbe7776d0ac084031f114167712269bf3d832 affected
… +10 more rows
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I. Basic Information for CVE-2025-38115

Vulnerability Information
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Vulnerability Title
net_sched: sch_sfq: fix a potential crash on gso_skb handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: fix a potential crash on gso_skb handling SFQ has an assumption of always being able to queue at least one packet. However, after the blamed commit, sch->q.len can be inflated by packets in sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed by an immediate drop. Fix sfq_drop() to properly clear q->tail in this situation. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 &
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sch_sfq队列处理不当，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 a53851e2c3218aa30b77abd6e68cf1c371f15afe ~ c337efb20d6d9f9bbb4746f6b119917af5c886dc -
Linux Linux 4.16 -

II. Public POCs for CVE-2025-38115

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III. Intelligence Information for CVE-2025-38115

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Same Patch Batch · Linux · 2025-07-03 · 78 CVEs total

CVE-2025-38123 9.8 CRITICAL net: wwan: t7xx: Fix napi rx poll issue
CVE-2025-38139 9.8 CRITICAL netfs: Fix oops in write-retry from mis-resetting the subreq iterator
CVE-2025-38120 9.4 CRITICAL netfilter: nf_set_pipapo_avx2: fix initial map fill
CVE-2025-38146 9.4 CRITICAL net: openvswitch: Fix the dead loop of MPLS parse
CVE-2025-38141 7.8 HIGH dm: fix dm_blk_report_zones
CVE-2025-38168 7.8 HIGH perf: arm-ni: Unregister PMUs on probe failure
CVE-2025-38162 7.8 HIGH netfilter: nft_set_pipapo: prevent overflow in lookup table allocation
CVE-2025-38154 7.8 HIGH bpf, sockmap: Avoid using sk_socket after free when sending
CVE-2025-38106 7.8 HIGH io_uring: fix use-after-free of sq->thread in __io_uring_show_fdinfo()
CVE-2025-38150 7.8 HIGH af_packet: move notifier's packet_dev_mc out of rcu critical section
CVE-2025-38108 7.8 HIGH net_sched: red: fix a race in __red_change()
CVE-2025-38110 7.8 HIGH net/mdiobus: Fix potential out-of-bounds clause 45 read/write access
CVE-2025-38111 7.8 HIGH net/mdiobus: Fix potential out-of-bounds read/write access
CVE-2025-38107 7.8 HIGH net_sched: ets: fix a race in ets_qdisc_change()
CVE-2025-38116 7.8 HIGH wifi: ath12k: fix uaf in ath12k_core_init()
CVE-2025-38117 7.8 HIGH Bluetooth: MGMT: Protect mgmt_pending list with its own lock
CVE-2025-38118 7.8 HIGH Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete
CVE-2025-38133 7.8 HIGH iio: adc: ad4851: fix ad4858 chan pointer handling
CVE-2025-38129 7.8 HIGH page_pool: Fix use-after-free in page_pool_recycle_in_ring
CVE-2025-38127 7.8 HIGH ice: fix Tx scheduler error handling in XDP callback

Showing top 20 of 78 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38115

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