このページは Ubuntu 向けの修正状況です。脆弱性そのものの説明は CVE 本体のページにあります。
CVE-2026-53260 の詳細 →
UBUNTU-CVE-2026-53260
In the Linux kernel, the following vulnerability has been resolved: tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req(). syzbot repor...
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
In the Linux kernel, the following vulnerability has been resolved: tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req(). syzbot reported a weird reqsk->rsk_refcnt underflow in __inet_csk_reqsk_queue_drop(). The captured reqsk_put() in _inet_csk_reqsk_queue_drop() is called only when it successfully removes reqsk from ehash. Moreover, reqsk_timer_handler() calls another reqsk_put() after that. This indicates that the reqsk was missing both refcnts for ehash and the timer itself. Since all the syzbot reports had PREEMPT_RT enabled, the only possible scenario is that reqsk_queue_hash_req() is preempted after mod_timer() and before refcount_set(), and then the timer triggered after 1s aborts the reqsk due to its listener's close(). Let's wrap mod_timer() and refcount_set() with preempt_disable_nested() and preempt_enable_nested(). Note that inet_ehash_insert() holds the normal spin_lock() (mutex in PREEMPT_RT), so it must be called outside of preempt_disable_nested(), but this is fine. The lookup path just ignores 0 sk_refcnt entries in ehash and tries to create another reqsk, but this will fail at inet_ehash_insert(). [0]: refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate+0xb2/0x110 lib/refcount.c:28, CPU#0: ktimers/0/16 Modules linked in: CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G L syzkaller #0 PREEMPT{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engi…
出典: OSV.dev (Open Source Vulnerabilities) OSV
影響パッケージ
Ubuntu:16.04:LTS
linux-hwe-edge
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Ubuntu:18.04:LTS
linux-aws-5.0
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Ubuntu:18.04:LTS
linux-aws-5.3
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Ubuntu:18.04:LTS
linux-azure
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Ubuntu:18.04:LTS
linux-azure-5.3
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Ubuntu:18.04:LTS
linux-azure-edge
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Ubuntu:18.04:LTS
linux-gcp
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Ubuntu:18.04:LTS
linux-gcp-5.3
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Ubuntu:18.04:LTS
linux-gke-4.15
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Ubuntu:18.04:LTS
linux-gke-5.4
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Ubuntu:18.04:LTS
linux-gkeop-5.4
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Ubuntu:18.04:LTS
linux-hwe
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Ubuntu:18.04:LTS
linux-hwe-edge
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Ubuntu:18.04:LTS
linux-oem
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Ubuntu:18.04:LTS
linux-oracle-5.0
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Ubuntu:18.04:LTS
linux-oracle-5.3
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Ubuntu:20.04:LTS
linux-aws-5.11
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Ubuntu:20.04:LTS
linux-aws-5.13
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Ubuntu:20.04:LTS
linux-aws-5.8
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Ubuntu:20.04:LTS
linux-azure-5.11
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Ubuntu:20.04:LTS
linux-azure-5.13
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Ubuntu:20.04:LTS
linux-azure-5.8
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Ubuntu:20.04:LTS
linux-azure-fde
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Ubuntu:20.04:LTS
linux-gcp-5.11
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Ubuntu:20.04:LTS
linux-gcp-5.13
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Ubuntu:20.04:LTS
linux-gcp-5.8
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Ubuntu:20.04:LTS
linux-gke
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Ubuntu:20.04:LTS
linux-gke-5.15
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Ubuntu:20.04:LTS
linux-gkeop
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Ubuntu:20.04:LTS
linux-gkeop-5.15
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Ubuntu:20.04:LTS
linux-hwe-5.11
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Ubuntu:20.04:LTS
linux-hwe-5.13
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Ubuntu:20.04:LTS
linux-hwe-5.8
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Ubuntu:20.04:LTS
linux-intel-5.13
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Ubuntu:20.04:LTS
linux-oem-5.10
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Ubuntu:20.04:LTS
linux-oem-5.13
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Ubuntu:20.04:LTS
linux-oem-5.14
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Ubuntu:20.04:LTS
linux-oem-5.6
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Ubuntu:20.04:LTS
linux-oracle-5.11
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Ubuntu:20.04:LTS
linux-oracle-5.13
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Ubuntu:20.04:LTS
linux-oracle-5.8
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Ubuntu:20.04:LTS
linux-raspi2
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Ubuntu:20.04:LTS
linux-riscv
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Ubuntu:20.04:LTS
linux-riscv-5.11
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Ubuntu:20.04:LTS
linux-riscv-5.8
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Ubuntu:22.04:LTS
linux-allwinner-5.19
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Ubuntu:22.04:LTS
linux-aws-5.19
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Ubuntu:22.04:LTS
linux-aws-6.2
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Ubuntu:22.04:LTS
linux-aws-6.5
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Ubuntu:22.04:LTS
linux-azure-5.19
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Ubuntu:22.04:LTS
linux-azure-6.2
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Ubuntu:22.04:LTS
linux-azure-6.5
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Ubuntu:22.04:LTS
linux-azure-fde-5.19
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Ubuntu:22.04:LTS
linux-azure-fde-6.2
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Ubuntu:22.04:LTS
linux-gcp-5.19
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Ubuntu:22.04:LTS
linux-gcp-6.2
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Ubuntu:22.04:LTS
linux-gcp-6.5
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Ubuntu:22.04:LTS
linux-hwe-5.19
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Ubuntu:22.04:LTS
linux-hwe-6.2
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Ubuntu:22.04:LTS
linux-hwe-6.5
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Ubuntu:22.04:LTS
linux-intel-iot-realtime
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Ubuntu:22.04:LTS
linux-lowlatency-hwe-5.19
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Ubuntu:22.04:LTS
linux-lowlatency-hwe-6.2
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Ubuntu:22.04:LTS
linux-lowlatency-hwe-6.5
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Ubuntu:22.04:LTS
linux-nvidia-6.2
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Ubuntu:22.04:LTS
linux-nvidia-6.5
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Ubuntu:22.04:LTS
linux-oem-5.17
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Ubuntu:22.04:LTS
linux-oem-6.0
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Ubuntu:22.04:LTS
linux-oem-6.1
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Ubuntu:22.04:LTS
linux-oem-6.5
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Ubuntu:22.04:LTS
linux-oracle-6.5
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Ubuntu:22.04:LTS
linux-realtime
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Ubuntu:22.04:LTS
linux-riscv
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Ubuntu:22.04:LTS
linux-riscv-5.19
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Ubuntu:22.04:LTS
linux-riscv-6.5
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Ubuntu:22.04:LTS
linux-starfive-5.19
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Ubuntu:22.04:LTS
linux-starfive-6.2
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Ubuntu:22.04:LTS
linux-starfive-6.5
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Ubuntu:24.04:LTS
linux-aws-6.14
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Ubuntu:24.04:LTS
linux-aws-6.17
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Ubuntu:24.04:LTS
linux-aws-7.0
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Ubuntu:24.04:LTS
linux-azure-6.11
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Ubuntu:24.04:LTS
linux-azure-6.14
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Ubuntu:24.04:LTS
linux-azure-6.17
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Ubuntu:24.04:LTS
linux-azure-7.0
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Ubuntu:24.04:LTS
linux-azure-fde-6.14
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Ubuntu:24.04:LTS
linux-azure-fde-7.0
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Ubuntu:24.04:LTS
linux-azure-nvidia-6.14
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Ubuntu:24.04:LTS
linux-gcp-6.11
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Ubuntu:24.04:LTS
linux-gcp-6.14
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Ubuntu:24.04:LTS
linux-gcp-6.17
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Ubuntu:24.04:LTS
linux-gcp-7.0
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Ubuntu:24.04:LTS
linux-hwe-6.11
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Ubuntu:24.04:LTS
linux-hwe-6.14
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Ubuntu:24.04:LTS
linux-hwe-6.17
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Ubuntu:24.04:LTS
linux-hwe-7.0
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Ubuntu:24.04:LTS
linux-lowlatency-hwe-6.11
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Ubuntu:24.04:LTS
linux-nvidia-6.11
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Ubuntu:24.04:LTS
linux-nvidia-6.17
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Ubuntu:24.04:LTS
linux-nvidia-7.0
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Ubuntu:24.04:LTS
linux-oem-6.11
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Ubuntu:24.04:LTS
linux-oem-6.14
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Ubuntu:24.04:LTS
linux-oem-6.17
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Ubuntu:24.04:LTS
linux-oem-6.8
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Ubuntu:24.04:LTS
linux-oracle-6.14
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Ubuntu:24.04:LTS
linux-oracle-6.17
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Ubuntu:24.04:LTS
linux-oracle-7.0
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Ubuntu:24.04:LTS
linux-raspi-realtime
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Ubuntu:24.04:LTS
linux-realtime
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Ubuntu:24.04:LTS
linux-riscv
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Ubuntu:24.04:LTS
linux-riscv-6.14
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Ubuntu:24.04:LTS
linux-riscv-6.17
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Ubuntu:24.04:LTS
linux-riscv-7.0
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Ubuntu:Pro:Realtime:24.04:LTS
linux-realtime-6.14
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Ubuntu:Pro:Realtime:24.04:LTS
linux-realtime-6.17
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Ubuntu:25.10
linux
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Ubuntu:25.10
linux-aws
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Ubuntu:25.10
linux-azure
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Ubuntu:25.10
linux-azure-fde
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Ubuntu:25.10
linux-gcp
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Ubuntu:25.10
linux-oracle
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Ubuntu:25.10
linux-raspi
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Ubuntu:25.10
linux-realtime
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Ubuntu:25.10
linux-riscv
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Ubuntu:26.04:LTS
linux
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Ubuntu:26.04:LTS
linux-aws
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Ubuntu:26.04:LTS
linux-azure
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Ubuntu:26.04:LTS
linux-azure-fde
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Ubuntu:26.04:LTS
linux-gcp
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Ubuntu:26.04:LTS
linux-gke
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Ubuntu:26.04:LTS
linux-ibm
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Ubuntu:26.04:LTS
linux-nvidia
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Ubuntu:26.04:LTS
linux-nvidia-bos
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Ubuntu:26.04:LTS
linux-oem-7.0
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Ubuntu:26.04:LTS
linux-oracle
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Ubuntu:26.04:LTS
linux-raspi
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Ubuntu:26.04:LTS
linux-realtime
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Ubuntu:26.04:LTS
linux-riscv
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参照URL
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- advisory ubuntu.com
- report ubuntu.com
- report cve.org
- report git.kernel.org
- report git.kernel.org
- report git.kernel.org