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CVE-2026-98345

Linux: wifi: cfg80211: check IP header size in cfg80211_classify8021d()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in18d5547327c202cda33ad2bbd203220c2c62c8a7Also 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734, 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017 and 2 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 18d5547327c202cda33ad2bbd203220c2c62c8a7LinuxCVE List
  • 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734LinuxCVE List
  • 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017LinuxCVE List
  • 65893c8d28f239c7ddad5a83683be193a9133e9bLinuxCVE List
  • 48b2c5c628b09cf36cbeca53e0432fc2a7518be7LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: check IP header size in cfg80211_classify8021d()

A frame that looks like IP can be transmitted, but be too short, so the DS field is read incorrectly:

BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 ... packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108

Use skb_header_pointer() like the MPLS case.

Text from CVE List

Affected versions 18

  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before 18d5547327c202cda33ad2bbd203220c2c62c8a7CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before f33ad4e2f846e55cf4637419268f093ac9f1a765CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before a2cdb4a675ca04c4ac8cc962848082d8ce065008CVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before 65893c8d28f239c7ddad5a83683be193a9133e9bCVE List
  • Linuxaffected: e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 before 48b2c5c628b09cf36cbeca53e0432fc2a7518be7CVE List
  • Linuxaffected: 2.6.31CVE List
  • Linuxunaffected: all versions before 2.6.31CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8