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CVE-2026-22999— net/sched: sch_qfq: do not free existing class in qfq_change_class()

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，该漏洞源于释放后重用问题，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 462dbc9101acd38e92eda93c0726857517a24bbd< 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e affected
462dbc9101acd38e92eda93c0726857517a24bbd< cff6cd703f41d8071995956142729e4bba160363 affected
462dbc9101acd38e92eda93c0726857517a24bbd< f06f7635499bc806cbe2bbc8805c7cef8b1edddf affected
462dbc9101acd38e92eda93c0726857517a24bbd< 0a234660dc70ce45d771cbc76b20d925b73ec160 affected
462dbc9101acd38e92eda93c0726857517a24bbd< 362e269bb03f7076ba9990e518aeddb898232e50 affected
462dbc9101acd38e92eda93c0726857517a24bbd< e9d8f11652fa08c647bf7bba7dd8163241a332cd affected
462dbc9101acd38e92eda93c0726857517a24bbd< 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 affected
3.8 affected
… +8 more rows
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I. Basic Information for CVE-2026-22999

Vulnerability Information
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Vulnerability Title
net/sched: sch_qfq: do not free existing class in qfq_change_class()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: do not free existing class in qfq_change_class() Fixes qfq_change_class() error case. cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.
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，该漏洞源于释放后重用问题，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 462dbc9101acd38e92eda93c0726857517a24bbd ~ 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-22999

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III. Intelligence Information for CVE-2026-22999

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Same Patch Batch · Linux · 2026-01-25 · 20 CVEs total

CVE-2026-23004 7.8 HIGH dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()
CVE-2025-71162 7.8 HIGH dmaengine: tegra-adma: Fix use-after-free
CVE-2026-23001 7.8 HIGH macvlan: fix possible UAF in macvlan_forward_source()
CVE-2026-23010 7.8 HIGH ipv6: Fix use-after-free in inet6_addr_del().
CVE-2026-23003 7.5 HIGH ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()
CVE-2026-22998 7.5 HIGH nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec
CVE-2026-22997 7.5 HIGH net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the
CVE-2026-23013 7.0 HIGH net: octeon_ep_vf: fix free_irq dev_id mismatch in IRQ rollback
CVE-2026-23009 xhci: sideband: don't dereference freed ring when removing sideband endpoint
CVE-2026-23008 drm/vmwgfx: Fix KMS with 3D on HW version 10
CVE-2026-23007 block: zero non-PI portion of auto integrity buffer
CVE-2026-23006 ASoC: tlv320adcx140: fix null pointer
CVE-2026-23005 x86/fpu: Clear XSTATE_BV[i] in guest XSAVE state whenever XFD[i]=1
CVE-2026-23002 lib/buildid: use __kernel_read() for sleepable context
CVE-2026-23011 ipv4: ip_gre: make ipgre_header() robust
CVE-2026-23000 net/mlx5e: Fix crash on profile change rollback failure
CVE-2026-22996 net/mlx5e: Don't store mlx5e_priv in mlx5e_dev devlink priv
CVE-2025-71163 dmaengine: idxd: fix device leaks on compat bind and unbind
CVE-2026-23012 mm/damon/core: remove call_control in inactive contexts

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-22999

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