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CVE-2026-89554

Опубликовано: 14 сент. 2026
Источник: ubuntu
Приоритет: medium
EPSS Низкий
CVSS3: 8.2

Описание

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.

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DNE

jammy

DNE

noble

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resolute

DNE

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DNE

esm-infra-legacy/xenial

ignored

superseded by linux-hwe
esm-infra/bionic

ignored

superseded by linux-hwe-5.4
jammy

DNE

noble

DNE

resolute

DNE

upstream

ignored

end of life

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DNE

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needs-triage

jammy

DNE

noble

DNE

resolute

DNE

upstream

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DNE

esm-infra/bionic

needs-triage

jammy

DNE

noble

DNE

resolute

DNE

upstream

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Показывать по

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DNE

jammy

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noble

DNE

resolute

DNE

upstream

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DNE

esm-infra/focal

ignored

end of kernel support
jammy

DNE

noble

DNE

resolute

DNE

upstream

ignored

end of life

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DNE

jammy

ignored

superseded by Ubuntu Pro ppa version
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DNE

realtime/jammy

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DNE

upstream

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DNE

jammy

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DNE

resolute

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DNE

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jammy

DNE

noble

DNE

resolute

DNE

upstream

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Показывать по

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DNE

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needs-triage

jammy

DNE

noble

DNE

resolute

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Показывать по

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DNE

esm-infra-legacy/xenial

needs-triage

esm-infra/bionic

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jammy

needs-triage

noble

DNE

resolute

DNE

upstream

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DNE

jammy

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DNE

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DNE

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jammy

DNE

noble

DNE

resolute

DNE

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DNE

jammy

ignored

superseded by linux-lowlatency-hwe-6.2
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DNE

resolute

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superseded by linux-lowlatency-hwe-6.2

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replaced by linux-hwe-6.14
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DNE

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DNE

jammy

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superseded by linux-lowlatency-hwe-6.5
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DNE

resolute

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ignored

superseded by linux-lowlatency-hwe-6.5

Показывать по

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DNE

jammy

ignored

superseded by linux-lowlatency-hwe-6.8
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DNE

resolute

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superseded by linux-lowlatency-hwe-6.8

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DNE

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DNE

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DNE

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end of kernel support
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end of kernel support

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DNE

jammy

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superseded by linux-nvidia-6.5
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superseded by linux-nvidia-6.8

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DNE

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DNE

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DNE

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DNE

resolute

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jammy

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DNE

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DNE

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DNE

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DNE

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jammy

DNE

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Показывать по

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DNE

esm-infra/bionic

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DNE

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end of life

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DNE

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ignored

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superseded by linux-oem-5.13

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esm-infra/focal

ignored

superseded by linux-oem-5.14
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superseded by linux-oem-6.1
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ignored

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superseded by linux-oem-6.1
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DNE

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jammy

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esm-infra/bionic

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esm-infra/focal

ignored

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esm-infra/bionic

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DNE

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ignored

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superseded by linux-oracle-5.11

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jammy

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superseded by linux-oracle-6.8
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superseded by Ubuntu Pro ppa version
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superseded by Ubuntu Pro ppa version
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needs-triage

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end of kernel support
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end of kernel support
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Показывать по

EPSS

Процентиль: 45%
0.0056
Низкий

8.2 High

CVSS3

Связанные уязвимости

CVSS3: 6.5
redhat
4 дня назад

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.

CVSS3: 8.2
nvd
4 дня назад

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.

CVSS3: 8.2
debian
4 дня назад

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

CVSS3: 8.2
github
4 дня назад

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.

EPSS

Процентиль: 45%
0.0056
Низкий

8.2 High

CVSS3

Уязвимость CVE-2026-89554