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CVE-2026-43481— net-shapers: don't free reply skb after genlmsg_reply()

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net_shaper_nl_get_doit和net_shaper_nl_cap_get_doit函数在genlmsg_reply失败后错误地调用nlmsg_free，可能导致双重释放回复skb。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb< 8738dcc844fff7d0157ee775230e95df3b1884d7 affected
4b623f9f0f59652ea71fcb27d60b4c3b65126dbb< 83f7b54242d0abbfce35a55c01322f50962ed3ee affected
4b623f9f0f59652ea71fcb27d60b4c3b65126dbb< 57885276cc16a2e2b76282c808a4e84cbecb3aae affected
6.13 affected
< 6.13 unaffected
6.18.19≤ 6.18.* unaffected
6.19.9≤ 6.19.* unaffected
7.0≤ * unaffected
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I. Basic Information for CVE-2026-43481

Vulnerability Information
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Vulnerability Title
net-shapers: don't free reply skb after genlmsg_reply()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net-shapers: don't free reply skb after genlmsg_reply() genlmsg_reply() hands the reply skb to netlink, and netlink_unicast() consumes it on all return paths, whether the skb is queued successfully or freed on an error path. net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() currently jump to free_msg after genlmsg_reply() fails and call nlmsg_free(msg), which can hit the same skb twice. Return the genlmsg_reply() error directly and keep free_msg only for pre-reply failures.
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net_shaper_nl_get_doit和net_shaper_nl_cap_get_doit函数在genlmsg_reply失败后错误地调用nlmsg_free，可能导致双重释放回复skb。
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 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb ~ 8738dcc844fff7d0157ee775230e95df3b1884d7 -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-43481

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III. Intelligence Information for CVE-2026-43481

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Patches & Fixes for CVE-2026-43481 (3)

Same Patch Batch · Linux · 2026-05-13 · 14 CVEs total

CVE-2026-43476 7.8 HIGH iio: chemical: sps30_i2c: fix buffer size in sps30_i2c_read_meas()
CVE-2026-43489 liveupdate: luo_file: remember retrieve() status
CVE-2026-43487 ata: libata-core: Disable LPM on ST1000DM010-2EP102
CVE-2026-43488 usb: xhci: Prevent interrupt storm on host controller error (HCE)
CVE-2026-43485 nouveau/gsp: drop WARN_ON in ACPI probes
CVE-2026-43486 arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults
CVE-2026-43484 mmc: core: Avoid bitfield RMW for claim/retune flags
CVE-2026-43482 sched_ext: Disable preemption between scx_claim_exit() and kicking helper work
CVE-2026-43483 KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated
CVE-2026-43480 ASoC: amd: acp3x-rt5682-max9836: Add missing error check for clock acquisition
CVE-2026-43479 net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect
CVE-2026-43477 drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL
CVE-2026-43478 ASoC: codecs: rt1011: Use component to get the dapm context in spk_mode_put

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43481

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