{
  "cveId": "CVE-2026-98271",
  "url": "https://patchblox.com/security/cve/CVE-2026-98271",
  "summary": "CVE-2026-98271 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-98271, released October 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net: skbuff: do not leave stale header offsets after pskb_carve()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: skbuff: do not leave stale header offsets after pskb_carve()  pskb_carve_inside_header() and pskb_carve_inside_nonlinear() remove the first bytes of a packet and reallocate skb-\u003Ehead.  All the headers that were present before the operation are gone, but both functions call skb_headers_offset_update(skb, 0), which is a no-op : skb-\u003Emac_header, skb-\u003Enetwork_header, skb-\u003Etransport_header and skb-\u003Ecsum_start keep their old values and now describe bytes which are no longer there.  Both helpers size the new head from the old skb_end_offset(), so the stale offsets still land inside the new allocation. They point past skb_tail_pointer() though, to bytes that were never initialized.  pskb_carve_inside_nonlinear() is the worst case, because it leaves a zombie skb with an empty linear part (skb-\u003Edata == skb_tail_pointer(skb), skb_headlen(skb) == 0), while skb_mac_header_was_set() is still true and skb-\u003Emac_header is way ahead of skb-\u003Edata.  The only user of pskb_extract() is rds_tcp_data_recv(), and the carved skb is queued on tinc-\u003Eti_skb_list. When the RDS incoming message is released, rds_tcp_inc_free() calls skb_queue_purge(), which frees the skbs with SKB_DROP_REASON_QUEUE_PURGE. This is visible from drop_monitor, which then tries to pull back to the (bogus) mac header :  skbuff: __skb_pull(len=234) skb len=6968 data_len=6968 headroom=0 headlen=0 tailroom=0 end-tail=384 mac=(234,14) mac_len=14 net=(248,40) trans=288 shinfo(txflags=0 nr_frags=1 gso(size=1428 type=16 segs=5)) csum(0x100120 start=288 offset=16 ip_summed=3 complete_sw=0 valid=1 level=0) hash(0x7b446c6c sw=0 l4=1) proto=0x86dd pkttype=0 iif=60 kernel BUG at ./include/linux/skbuff.h:2847!  Add skb_carve_reset_headers() to mark the mac and transport headers as not set, reset the network header, clear skb-\u003Emac_len, and drop a now meaningless CHECKSUM_PARTIAL (csum_start no longer describes anything).  Invalidate the inner offsets as well. Unlike mac_header and transport_header they have no \u0022unset\u0022 sentinel, so a leftover non-zero value still looks like a real header. Zero skb-\u003Einner_mac_header, skb-\u003Einner_network_header, skb-\u003Einner_transport_header, skb-\u003Einner_protocol and skb-\u003Eencapsulation, so that all the header state is invalidated in one place.  v2: fixed an inaccurate changelog. The stale offsets stay inside the     new skb-\u003Ehead, which is never smaller than the old one, they     simply point past skb_tail_pointer() to bytes that are gone.     Thanks to Xuanqiang Luo for insisting on this.     Also invalidate the inner header state, as suggested by the     netdev AI review :     https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260911114922.621937-1-edumazet%40google.com",
  "published": "2026-10-06T09:18:16Z",
  "severity": "Moderate",
  "cvss": 6.1,
  "epss": 0.00168,
  "epssPercentile": 0.06131,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98271",
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      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.54-121.166.amzn2023",
      "fix": "ALAS2023-2026-3192",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192",
      "released": "2026-11-07T01:06:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}