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amt: re-read skb header pointers after every pull

Type: advisorySource: OSV1 source record

In the Linux kernel, the following vulnerability has been resolved: amt: re-read skb header pointers after every pull Several AMT receive and transmit paths cache a pointer into the skb head (ip_hdr(), ipv6_hdr(), eth_hdr() or the AMT message header) and then call a helper that can reallocate that head before the cached pointer is used again. pskb_may_pull(), ip_mc_may_pull(), ipv6_mc_may_pull(), iptunnel_pull_header(), ip_mc_check_igmp() and ipv6_mc_check_mld() can all free the old head and move the data, so a pointer taken before the call dangles afterwards and the later access is a use-after-free of the freed head. The affected sites are: amt_rcv() caches ip_hdr() before amt_parse_type() pulls, then reads iph->saddr. amt_dev_xmit() caches ip_hdr()/ipv6_hdr() before ip_mc_check_igmp()/ ipv6_mc_check_mld() and pskb_may_pull(), then reads the group address. amt_multicast_data_handler() caches eth_hdr() before pskb_may_pull(), then writes the L2 header. amt_membership_query_handler() caches the AMT header, the outer and inner eth_hdr() and ip_hdr() before iptunnel_pull_header() and several pulls, then reads and writes them. amt_igmpv3_report_handler() and amt_mldv2_report_handler() cache ip_hdr()/ipv6_hdr() and the current group record and read the record count from the report header inside the record loop, across the *_mc_may_pull() calls. amt_update_handler() caches ip_hdr() and the AMT membership-update header before pskb_may_pull(), iptunnel_pull_header(), ip_mc_check_igmp

Announced Source revision 1
Original source ↗

CVE-2026-68302

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: osv:CVE-2026-68302

Kernel

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
6.1.183

Source reference: /affected/1/ranges

6.6.148

Source reference: /affected/1/ranges

6.12.101

Source reference: /affected/1/ranges

6.18.42

Source reference: /affected/1/ranges

7.1.6

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
        "type": "GIT",
        "events": [
          {
            "introduced": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4"
          },
          {
            "fixed": "37ff890f9c18dfbcf57e17199901d4fd1e4c174e"
          },
          {
            "fixed": "9005b221cb1f9c3c1a2ef656fb0e8fa80c0a187e"
          },
          {
            "fixed": "7746d588d42a4ac0117b68ed8e9b22a9da53dfb7"
          },
          {
            "fixed": "ca0e8b661957f777591efe874cd9d9a63619cd99"
          },
          {
            "fixed": "7f48e3ddad8e97545b25788b8203b3a539df1621"
          },
          {
            "fixed": "3656a79f94c471827a08f2cacce5f94ad5e52c24"
          }
        ]
      }
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68302.json"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "5.16.0"
          },
          {
            "fixed": "6.1.183"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.2.0"
          },
          {
            "fixed": "6.6.148"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.7.0"
          },
          {
            "fixed": "6.12.101"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.13.0"
          },
          {
            "fixed": "6.18.42"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.19.0"
          },
          {
            "fixed": "7.1.6"
          }
        ]
      }
    ],
    "package": {
      "name": "Kernel",
      "ecosystem": "Linux"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68302.json"
    }
  }
]
Related CVEs
CVE-2026-68302

Source reference: /id

Publisher severity

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Event
#50733 · Revision 1
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Publisher date
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