Vulnerability-Lookup

alsa-2025:21931

Vulnerability from osv_almalinux

Published

2025-11-24 00:00

Modified

2025-12-05 08:40

Summary

Moderate: kernel security update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730)
kernel: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect() (CVE-2025-39955)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730)\n  * kernel: tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect() (CVE-2025-39955)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2025:21931",
  "modified": "2025-12-05T08:40:44Z",
  "published": "2025-11-24T00:00:00Z",
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      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2025:21931"
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      "url": "https://access.redhat.com/security/cve/CVE-2025-39955"
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      "url": "https://bugzilla.redhat.com/2393731"
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      "url": "https://errata.almalinux.org/10/ALSA-2025-21931.html"
    }
  ],
  "related": [
    "CVE-2025-39730",
    "CVE-2025-39955"
  ],
  "summary": "Moderate: kernel security update"
}

CVE-2025-39955 (GCVE-0-2025-39955)

Vulnerability from cvelistv5 – Published: 2025-10-09 09:47 – Updated: 2025-10-09 09:47

Title

tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().

Summary

In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect(). syzbot reported the splat below where a socket had tcp_sk(sk)->fastopen_rsk in the TCP_ESTABLISHED state. [0] syzbot reused the server-side TCP Fast Open socket as a new client before the TFO socket completes 3WHS: 1. accept() 2. connect(AF_UNSPEC) 3. connect() to another destination As of accept(), sk->sk_state is TCP_SYN_RECV, and tcp_disconnect() changes it to TCP_CLOSE and makes connect() possible, which restarts timers. Since tcp_disconnect() forgot to clear tcp_sk(sk)->fastopen_rsk, the retransmit timer triggered the warning and the intended packet was not retransmitted. Let's call reqsk_fastopen_remove() in tcp_disconnect(). [0]: WARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7)) Modules linked in: CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7)) Code: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 <0f> 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e RSP: 0018:ffffc900002f8d40 EFLAGS: 00010293 RAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017 RDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400 RBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8 R10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540 R13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0 FS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0 Call Trace: <IRQ> tcp_write_timer (net/ipv4/tcp_timer.c:738) call_timer_fn (kernel/time/timer.c:1747) __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372) timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135) tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035) __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1)) tmigr_handle_remote (kernel/time/timer_migration.c:1096) handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580) irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35)) </IRQ>

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/7ec092a91ff351dcd…
	https://git.kernel.org/stable/c/a4378dedd6e07e62f…
	https://git.kernel.org/stable/c/33a4fdf0b4a25f8ce…
	https://git.kernel.org/stable/c/17d69972757781419…
	https://git.kernel.org/stable/c/dfd06131107e7b699…
	https://git.kernel.org/stable/c/fa4749c065644af4d…
	https://git.kernel.org/stable/c/ae313d14b45eca7a6…
	https://git.kernel.org/stable/c/45c8a6cc2bcd780e6…

Impacted products

Vendor

Product

Version

Linux

Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 7ec092a91ff351dcde89c23e795b73a328274db6 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < a4378dedd6e07e62f2fccb17d78c9665718763d0 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 33a4fdf0b4a25f8ce65380c3b0136b407ca57609 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 17d699727577814198d744d6afe54735c6b54c99 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < dfd06131107e7b699ef1e2a24ed2f7d17c917753 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < fa4749c065644af4db496b338452a69a3e5147d9 (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < ae313d14b45eca7a6bb29cb9bf396d977e7d28fb (git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01 (git)

Linux

Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.154 , ≤ 6.1.* (semver)
Unaffected: 6.6.108 , ≤ 6.6.* (semver)
Unaffected: 6.12.49 , ≤ 6.12.* (semver)
Unaffected: 6.16.9 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().\n\nsyzbot reported the splat below where a socket had tcp_sk(sk)-\u003efastopen_rsk\nin the TCP_ESTABLISHED state. [0]\n\nsyzbot reused the server-side TCP Fast Open socket as a new client before\nthe TFO socket completes 3WHS:\n\n  1. accept()\n  2. connect(AF_UNSPEC)\n  3. connect() to another destination\n\nAs of accept(), sk-\u003esk_state is TCP_SYN_RECV, and tcp_disconnect() changes\nit to TCP_CLOSE and makes connect() possible, which restarts timers.\n\nSince tcp_disconnect() forgot to clear tcp_sk(sk)-\u003efastopen_rsk, the\nretransmit timer triggered the warning and the intended packet was not\nretransmitted.\n\nLet\u0027s call reqsk_fastopen_remove() in tcp_disconnect().\n\n[0]:\nWARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\nModules linked in:\nCPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\nCode: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 \u003c0f\u003e 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e\nRSP: 0018:ffffc900002f8d40 EFLAGS: 00010293\nRAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017\nRDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400\nRBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8\nR10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540\nR13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0\nFS:  0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0\nCall Trace:\n \u003cIRQ\u003e\n tcp_write_timer (net/ipv4/tcp_timer.c:738)\n call_timer_fn (kernel/time/timer.c:1747)\n __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372)\n timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135)\n tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035)\n __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1))\n tmigr_handle_remote (kernel/time/timer_migration.c:1096)\n handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)\n irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35))\n \u003c/IRQ\u003e"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7ec092a91ff351dcde89c23e795b73a328274db6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4378dedd6e07e62f2fccb17d78c9665718763d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/33a4fdf0b4a25f8ce65380c3b0136b407ca57609"
        },
        {
          "url": "https://git.kernel.org/stable/c/17d699727577814198d744d6afe54735c6b54c99"
        },
        {
          "url": "https://git.kernel.org/stable/c/dfd06131107e7b699ef1e2a24ed2f7d17c917753"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa4749c065644af4db496b338452a69a3e5147d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae313d14b45eca7a6bb29cb9bf396d977e7d28fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01"
        }
      ],
      "title": "tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39955",
    "datePublished": "2025-10-09T09:47:33.556Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2025-10-09T09:47:33.556Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

CVE-2025-39730 (GCVE-0-2025-39730)

Vulnerability from cvelistv5 – Published: 2025-09-07 15:16 – Updated: 2025-11-03 17:42

Title

NFS: Fix filehandle bounds checking in nfs_fh_to_dentry()

Summary

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() The function needs to check the minimal filehandle length before it can access the embedded filehandle.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/7f8eca87fef7519e9…
	https://git.kernel.org/stable/c/cb09afa0948d96b1e…
	https://git.kernel.org/stable/c/3570ef5c31314c132…
	https://git.kernel.org/stable/c/763810bb883cb4de4…
	https://git.kernel.org/stable/c/12ad3def2e5e0b120…
	https://git.kernel.org/stable/c/2ad40b7992aa26bc6…
	https://git.kernel.org/stable/c/b7f7866932466332a…
	https://git.kernel.org/stable/c/7dd36f7477d1e03a1…
	https://git.kernel.org/stable/c/ef93a685e01a281b5…

Impacted products

Vendor

Product

Version

Linux

Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 7f8eca87fef7519e9c41f3258f25ebc2752247ee (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < cb09afa0948d96b1e385d609ed044bb1aa043536 (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 3570ef5c31314c13274c935a20b91768ab5bf412 (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 763810bb883cb4de412a72f338d80947d97df67b (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40 (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 2ad40b7992aa26bc631afc1a995b0e3ddc30de3f (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < b7f7866932466332a2528fda099000b035303485 (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < 7dd36f7477d1e03a1fcf8d13531ca326c4fb599f (git)
Affected: 20fa19027286983ab2734b5910c4a687436e0c31 , < ef93a685e01a281b5e2a25ce4e3428cf9371a205 (git)

Linux

Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.148 , ≤ 6.1.* (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

alsa-2025:21931

Vulnerability from osv_almalinux

CVE-2025-39955 (GCVE-0-2025-39955)

CVE-2025-39730 (GCVE-0-2025-39730)

Tags

Sightings

Nomenclature