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CVE-2026-43501— ipv6: rpl: reserve mac_len headroom when recompressed SRH grows

AI Predicted 7.8 Difficulty: Easy EPSS 0.02% · P7

Possible ATT&CK Techniques 1AI

T1498 · Network Denial of Service

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3< 8e8be63465a5e80394c70324603dfea1bfdad48faffected
8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3< 4babc2d9fda2df43823b85d08a0180b68f1b0854affected
8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3< c261d07a80576dc8ccf394ef8f074f8c67a06b37affected
8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3< 7398ebefbfd4f8a31d4f665a4213302fa995494baffected
8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3< 9e6bf146b55999a095bb14f73a843942456d1adcaffected
5.7affected
< 5.7unaffected
6.6.140≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-43501

Vulnerability Information
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Vulnerability Title
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps the next segment into ipv6_hdr->daddr, recompresses, then pulls the old header and pushes the new one plus the IPv6 header back. The recompressed header can be larger than the received one when the swap reduces the common-prefix length the segments share with daddr (CmprI=0, CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes). pskb_expand_head() was gated on segments_left == 0, so on earlier segments the push consumed unchecked headroom. Once skb_push() leaves fewer than skb->mac_len bytes in front of data, skb_mac_header_rebuild()'s call to: skb_set_mac_header(skb, -skb->mac_len); will store (data - head) - mac_len into the u16 mac_header field, which wraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB past skb->head. A single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two segment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one pass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv. Fix this by expanding the head whenever the remaining room is less than the push size plus mac_len, and request that much extra so the rebuilt MAC header fits afterwards.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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: rpl中重压缩SRH增长时未预留mac_len头部空间，可能导致内存越界写入。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 ~ 8e8be63465a5e80394c70324603dfea1bfdad48f -
LinuxLinux 5.7 -

II. Public POCs for CVE-2026-43501

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III. Intelligence Information for CVE-2026-43501

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Patches & Fixes for CVE-2026-43501 (5)

Same Patch Batch · Linux · 2026-05-21 · 8 CVEs total

CVE-2026-43502net/rds: handle zerocopy send cleanup before the message is queued
CVE-2026-43498accel/ivpu: Disallow re-exporting imported GEM objects
CVE-2026-43499rtmutex: Use waiter::task instead of current in remove_waiter()
CVE-2026-43497fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free
CVE-2026-43496net/sched: sch_red: Replace direct dequeue call with peek and qdisc_dequeue_peeked
CVE-2026-43495net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler
CVE-2026-43494net/rds: reset op_nents when zerocopy page pin fails

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43501

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