CVE-2026-63984Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() ipv6_rpl_srh_decompress() computes: outhdr->hdrlen = (((n + 1) * sizeof(struct in6_addr)) >> 3); hdrl…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
ipv6_rpl_srh_decompress() computes:
outhdr->hdrlen = (((n + 1) * sizeof(struct in6_addr)) >> 3);
hdrlen is __u8. For n >= 127 the result exceeds 255 and silently truncates. With n=127 (cmpri=15, cmpre=15, pad=0, hdrlen=16):
(128 * 16) >> 3 = 256, truncated to 0 as __u8
The caller in ipv6_rpl_srh_rcv() then places the compressed header at buf + ((ohdr->hdrlen + 1) << 3). With hdrlen=0 this is buf + 8, but the decompressed region occupies buf[0..2055] (8-byte header plus 128 full addresses). The compressed header overlaps the decompressed data, and ipv6_rpl_srh_compress() writes into this overlap, corrupting the routing header of the forwarded packet.
The existing guard at exthdrs.c:546 checks (n + 1) > 255, which prevents n+1 from overflowing unsigned char (the segments_left field), but does not prevent the computed hdrlen from overflowing __u8. n=127 passes because 128 <= 255, yet hdrlen=256 does not fit.
Tighten the bound to (n + 1) > 127. This caps n at 126, giving hdrlen = (127 * 16) >> 3 = 254, which fits in __u8. The compressed header then lands at buf + ((254 + 1) << 3) = buf + 2040, exactly past the decompressed region (buf[0..2039]). No overlap. 127 segments is well beyond any realistic RPL deployment.
Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 75b3680047bf09af8e7e471a7a6ddf2ce5847f56Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < fd238c51b0fa5390cceca9f1ac5a9ffda8063eedLinux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 3618b34942b76471d044369bfd30d58c39068bf1Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 97e06791368c01f0ad2a4b3269c2abe19485ca32Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < de02fc049352af5a9595f015511222d0a85c326bLinux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 6fe1cb312038516cb4d9fa089d700af7059f1a64Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < c0487a9c1e116cf349e2d1f302d9019670460858Linux >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 9d5e7a46a9f6d8f503b41bfefef70659845f1679Linux 5.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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