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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-43036

net: use skb_header_pointer() for TCPv4 GSO frag_off check

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso_features_check() reads iph->frag_off to decide whether to clear mangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr() can rely on skb header offsets that are not always safe for direct dereference on packets injected from PF_PACKET paths. Use skb_header_pointer() for the TCPv4 frag_off check so the header read is robust whether data is already linear or needs copying. [1] https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cbc53e08a793b073e79f42ca33f1f3568703540d to < 362bacb37d88a178bfaefc4484623eae44425a70affected
  • cbc53e08a793b073e79f42ca33f1f3568703540d to < 5057502630fbc8ce468ff617ff59af275960b537affected
  • cbc53e08a793b073e79f42ca33f1f3568703540d to < f7a6cd508e9e825a2c69fa9e13d41ee156852f25affected
  • cbc53e08a793b073e79f42ca33f1f3568703540d to < cc91202fc20a44aab4c206f12a2bfe05da936051affected
  • cbc53e08a793b073e79f42ca33f1f3568703540d to < d970341cfa5594614c7a6634886c7688b4f5cafdaffected
  • cbc53e08a793b073e79f42ca33f1f3568703540d to < ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0affected

Linux Linux

Default version status: affected

  • 4.7affected
  • 0 to < 4.7unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.81 to ≤ 6.12.*unaffected
  • 6.18.22 to ≤ 6.18.*unaffected
  • 6.19.12 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References