bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.271, 5.15.222, 6.1.189, 6.12.112, 6.18.55, 6.6.158, 7.2.9
- CVEs
- CVE-2026-98383
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 00:20 UTC · Revision 1
Source evidence
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
core-osv · Original sourcePublished 9 Oct 2026, 07:34 UTC
In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().
osv:CVE-2026-98383
Kernel
Fixed versions: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, 7.2.9
Complete source record
{
"id": "50374ca274ea04abbcd222450d58dcbdd236ecfdf1a13e2f8e23c92f13c445e2",
"url": "https://osv.dev/vulnerability/CVE-2026-98383",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL",
"summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().",
"evidence": "osv:CVE-2026-98383",
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"modified": "2026-10-28T02:30:51.958364769Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98383.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-98383",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"provider_metadata": {
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"related_cves": [
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 520916,
"published_at": "2026-10-09T07:34:22.408+00:00"
}