CVE-2026-98968

Что произошло

In the Linux kernel, the following vulnerability has been resolved: amt: send the relay's General Query directly from the receive path An skb queued in a qdisc can outlive the tunnel it references through a raw pointer in skb->cb. For example, with igmp_qrv set to 1 on the relay a tunnel lives for 135s, so a netem delay of 180s on the amt device outlives it; when the tunnel expires and is freed, the subsequent dequeue triggers a use-after-free in amt_dev_xmit(). BUG: KASAN: slab-use-after-free in amt_dev_xmit+0x2763/0x2e20 Call Trace: amt_dev_xmit+0x2763/0x2e20 [drivers/net/amt.c:1262] dev_hard_start_xmit+0x22f/0x620 sch_direct_xmit+0x12e/0xac0 netem_dequeue+0x333/0xc50 net_tx_action+0x35c/0xa60 amt_send_igmp_gq() and amt_send_mld_gq() are only called from amt_request_handler(), inside the rcu_read_lock_bh() section of amt_rcv(). amt_request_handler() already has the tunnel the query is for: it found or created it inside that section. Queuing the query with dev_queue_xmit() only leads back into amt_dev_xmit(), which strips the Ethernet header and calls amt_send_membership_query() for that tunnel. Make that call directly from the two senders instead, the same way amt_send_advertisement() transmits from the receive path. The query never waits in a qdisc, the tunnel is only dereferenced inside the RCU section that found or created it, and nothing is stored in skb->cb, so no lookup or refcount is needed. Remove the query branch of amt_dev_xmit(), amt_skb_cb() and struct amt_skb_cb, which have no users left. Behaviour changes: - The relay's own General Queries no longer pass through the amt device's egress path: its qdisc, tc egress (clsact/tcx), the netfilter egress hook and packet taps. They are still visible as UDP on the underlay. - A query that is sent successfully is no longer counted as tx_dropped. The old query branch left through the unlock label, which counted every sent query as dropped. - A query that reaches amt_dev_xmit() on a relay from elsewhere, such as a userspace querier, is now dropped at the IGMP/MLD type switch. Before, it trusted whatever skb->cb held, and a NULL tunnel hit the WARN_ON(1).

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "423a46053788ec4a021d57e69d66db7f7f550da4",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "95114e421196250e3d9662f12df442799477d3c3",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "e7183b7d518ce8b3e1f7284f9881d7a87569df14",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "181cb48c1e9af6b402567e132f879f89d1c54131",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "e7ea63b4195a150604993044ab574d8240f2a399",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
  "lessThan": "afae89de73dd693cfa329580ba0fba63bd3f0a11",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5.16"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "5.16",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.1.191",
  "versionType": "semver",
  "lessThanOrEqual": "6.1.*"
}

{
  "status": "unaffected",
  "version": "6.6.160",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.113",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.57",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.11",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-02T21:15:49.080901+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.945664+00:00"
  },
  "scores": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.945664+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.945664+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-02T21:15:49.080901+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.945664+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены03.11.2026, 00:15
2. Данные обновлены02.11.2026, 03:33
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены30.10.2026, 20:51
6. Данные обновлены30.10.2026, 15:58
7. Данные обновлены29.10.2026, 12:47
8. Опубликована28.10.2026, 23:15

Личная заметка и статус

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