ipv6: sr: restore network header before routing and forwarding
In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: restore network header before routing and forwarding ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH) while skb_network_header() points at the IPv6 header. When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately followed the fixed IPv6 header. If another extension header (such as a Hop-by-Hop options header) precedes the SRH, skb_network_offset() remained negative. This led to two problems: 1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes __skb_flow_dissect() which passes the negative skb_network_offset() to flow dissection, breaking BPF and C flow dissector logic. 2. If forwarded via ip6_forward() or redirected via act_mirred, downstream handlers (like sch_fragment() or neighbour output) pass the negative offset as an unsigned length, triggering OOB memcpy or buffer overflows. Fix this by pushing -skb_network_offset(skb) before routing, ensuring skb_network_offset(skb) is 0 for route lookup / flow dissection as well as downstream forwarding. On the loopback path, pull skb_transport_offset(skb) to restore skb->data to the SRH before looping back.
CVE-2026-98096
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98096
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "f463c4786cf27376de7dfc0833a12e924a98f698",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "8f44d4160bcdb3136a9145a4b9c7816382976925",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bc",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "af08f62b5a5a446d6134a92d86771d3d12e0e3da",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "ce4c8beedc19aceeab0e7bdc6f34394fb158c47c",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "97b21ef57dfabbff660a4672c9fef7edfb720f47",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "3ad7dca5e03bd64c65983a19734337512fd75491",
"versionType": "git"
},
{
"status": "affected",
"version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
"lessThan": "975b5b067f525a1b1338c4a3bee1c46545801518",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/exthdrs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/exthdrs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98096
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38202 · Revision 1
- Added to Heist Feed
- Publisher date