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CVE-2026-43339— ipv6: prevent possible UaF in addrconf_permanent_addr()

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IPv6地址配置中addrconf_permanent_addr函数在访问ipv6后可能发生释放后重用，消息传递时机过晚。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< eec49a33611f20336b357b3953df44f1a02049e8 affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< bacc7f31085c9820922f00bc7d79756ffa13123a affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< 7bfafa1b0cd582983ebec6bb20f0a435528fe567 affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< 7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< 25357b670afb5b517096da783abaa5cc4bf8359e affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< 3cd4efb5df72843dfac892d0b3c7a4a8bd926b65 affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< 2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1 affected
f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac< fd63f185979b047fb22a0dfc6bd94d0cab6a6a70 affected
… +10 more rows
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I. Basic Information for CVE-2026-43339

Vulnerability Information
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Vulnerability Title
ipv6: prevent possible UaF in addrconf_permanent_addr()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible UaF in addrconf_permanent_addr() The mentioned helper try to warn the user about an exceptional condition, but the message is delivered too late, accessing the ipv6 after its possible deletion. Reorder the statement to avoid the possible UaF; while at it, place the warning outside the idev->lock as it needs no protection.
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IPv6地址配置中addrconf_permanent_addr函数在访问ipv6后可能发生释放后重用，消息传递时机过晚。
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 f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac ~ eec49a33611f20336b357b3953df44f1a02049e8 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-43339

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III. Intelligence Information for CVE-2026-43339

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Patches & Fixes for CVE-2026-43339 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-43452 8.2 HIGH netfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43339

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