CVE-2026-98503

Что произошло

In the Linux kernel, the following vulnerability has been resolved: packet: use ubuf_info completion for TX_RING packets tpacket_snd sends skbs with frags pointing into its ring slots. Slots are released when skb->destructor is called. A call to skb_orphan calls skb->destructor before the skb is freed. This can cause the slot to be reused while still linked into the skb. Switch to standard zerocopy completion (ubuf_info) so the slot is only released once all references to the payload are freed or copied. Restore skb->destructor to standard sock_wfree. The ubuf_info completion callback can be called with a NULL skb, but only from net_zcopy_put and related API, used by zerocopy implementations that hold their own reference on the uarg, such as MSG_ZEROCOPY. This uarg is only ever completed from skb_zcopy_clear, so skb is always set. To prevent userspace from aliasing in-flight state on shared ring slots, allocate tpacket_uarg per packet, rather than per slot. This adds a small allocation to the transmit path. Use standard kmalloc to allow backporting to stable kernels. The uarg holds an sk_wmem_alloc reference, rather than an sk_refcnt reference. packet_free_tx_ring waits on sk_wmem_alloc before freeing the ring pages. Always allocate vec->deferred for tx_ring so page-backed rings also wait on sk_wmem_alloc when skb_copy_ubufs drops page refs before calling tpacket_ubuf_complete. Drop the tx_ring.pg_vec test that tpacket_destruct_skb performed before accessing the slot. The sk_wmem_alloc reference now guarantees that the slot is valid. The test is also not sufficient by itself, as it reads pg_vec without pg_vec_lock, so it can race with packet_set_ring. As a result a slot is released when its payload is copied, which can be before transmission (e.g., in skb_orphan_frags_rx). If copied before skb_tx_timestamp() is called, no slot timestamp is recorded, similar to when skb_orphan() was called early in the datapath before this patch. Revert the now unused previous skb_zcopy_.._nouarg infra. Depends on commit 992cc9f94ca9 ("net/packet: defer vmalloc TX_RING free until skbs finish").

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": "5cd8d46ea1562be80063f53c7c6a5f40224de623",
  "lessThan": "e67c455d79fbf709a94965f09a2be6bf4f4ba5fd",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5cd8d46ea1562be80063f53c7c6a5f40224de623",
  "lessThan": "eda9bcb721f15a93746a99eabda33d80b86404fd",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5cd8d46ea1562be80063f53c7c6a5f40224de623",
  "lessThan": "2a0c9afefc0ecea2cc30ccfbbbc98182a0986191",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5cd8d46ea1562be80063f53c7c6a5f40224de623",
  "lessThan": "9518405613863d0bf0700927a21367f5942cf058",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "67f6fba765ef8cb19089d476e3c367212a2fbdfd",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "f2a67e68dbaeae7c88e5522873d7b908911f9f77",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "4.14.86",
  "lessThan": "4.15",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "4.19.7",
  "lessThan": "4.20",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "4.20"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "4.20",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.12.112",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.55",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.9",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

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

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:05.858544+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.437077+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.437077+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.437077+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:05.858544+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.437077+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены04.11.2026, 00:16
2. Данные обновлены03.11.2026, 00:15
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены29.10.2026, 12:47
6. Опубликована28.10.2026, 23:13

Личная заметка и статус

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