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CVE-2026-43099— ipv4: icmp: fix null-ptr-deref in icmp_build_probe()

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icmp_build_probe中ipv6_stub->ipv6_dev_find可能返回ERR_PTR导致空指针解引用。

CVSS 7.5 · High EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux d329ea5bd8845f0b196bf41b18b6173340d6e0e4< 0f21bc261e60f0c696c58841c4873ff77ed83673 affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< dc5db4db19766a61ad65d81d1f55b1c1e51ba78d affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< 47a8bf52156ac7e7a581eca31c1f964ba4258d4d affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< 6be325206850a0891896d38bcf83a09d8b54ec48 affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< f91b3ed9e7fa82a70511b5f6901c88379acf2964 affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4< fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 affected
5.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-43099

Vulnerability Information
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Vulnerability Title
ipv4: icmp: fix null-ptr-deref in icmp_build_probe()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: fix null-ptr-deref in icmp_build_probe() ipv6_stub->ipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the IPv6 stack is not active (CONFIG_IPV6=m and not loaded), and passing this error pointer to dev_hold() will cause a kernel crash with null-ptr-deref. Instead, silently discard the request. RFC 8335 does not appear to define a specific response for the case where an IPv6 interface identifier is syntactically valid but the implementation cannot perform the lookup at runtime, and silently dropping the request may safer than misreporting "No Such Interface".
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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icmp_build_probe中ipv6_stub->ipv6_dev_find可能返回ERR_PTR导致空指针解引用。
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 d329ea5bd8845f0b196bf41b18b6173340d6e0e4 ~ 0f21bc261e60f0c696c58841c4873ff77ed83673 -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-43099

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III. Intelligence Information for CVE-2026-43099

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Patches & Fixes for CVE-2026-43099 (7)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-43208 9.8 CRITICAL net: do not pass flow_id to set_rps_cpu()
CVE-2026-43198 9.8 CRITICAL tcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-43125 9.8 CRITICAL dlm: validate length in dlm_search_rsb_tree
CVE-2026-43186 9.8 CRITICAL ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-43185 9.8 CRITICAL ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-43114 9.4 CRITICAL netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43117 9.1 CRITICAL btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43215 8.8 HIGH cifs: Fix locking usage for tcon fields
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-43187 8.8 HIGH xfs: delete attr leaf freemap entries when empty

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43099

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