Vulnerability-Lookup

EUVD-2026-320302

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:39

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:39:56.047049+00:00",
  "id": "EUVD-2026-320302"
}

CVE-2022-49441 (GCVE-0-2022-49441)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2026-05-23 15:22

Title

tty: fix deadlock caused by calling printk() under tty_port->lock

Summary

In the Linux kernel, the following vulnerability has been resolved: tty: fix deadlock caused by calling printk() under tty_port->lock pty_write() invokes kmalloc() which may invoke a normal printk() to print failure message. This can cause a deadlock in the scenario reported by syz-bot below: CPU0 CPU1 CPU2 ---- ---- ---- lock(console_owner); lock(&port_lock_key); lock(&port->lock); lock(&port_lock_key); lock(&port->lock); lock(console_owner); As commit dbdda842fe96 ("printk: Add console owner and waiter logic to load balance console writes") said, such deadlock can be prevented by using printk_deferred() in kmalloc() (which is invoked in the section guarded by the port->lock). But there are too many printk() on the kmalloc() path, and kmalloc() can be called from anywhere, so changing printk() to printk_deferred() is too complicated and inelegant. Therefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so that printk() will not be called, and this deadlock problem can be avoided. Syzbot reported the following lockdep error: ====================================================== WARNING: possible circular locking dependency detected 5.4.143-00237-g08ccc19a-dirty #10 Not tainted ------------------------------------------------------ syz-executor.4/29420 is trying to acquire lock: ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline] ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023 but task is already holding lock: ffff8880119c9158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&port->lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159 tty_port_tty_get drivers/tty/tty_port.c:288 [inline] <-- lock(&port->lock); tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47 serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767 serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] <-- lock(&port_lock_key); serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870 serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156 [...] -> #1 (&port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159 serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198 <-- lock(&port_lock_key); call_console_drivers kernel/printk/printk.c:1819 [inline] console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504 vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024 <-- lock(console_owner); vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394 printk+0xba/0xed kernel/printk/printk.c:2084 register_console+0x8b3/0xc10 kernel/printk/printk.c:2829 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681 console_init+0x49d/0x6d3 kernel/printk/printk.c:2915 start_kernel+0x5e9/0x879 init/main.c:713 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 -> #0 (console_owner){....}-{0:0}: [...] lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734 console_trylock_spinning kernel/printk/printk.c:1773 ---truncated---

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:40 UTC

CWE

CWE-667 - Improper Locking

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/4af21b12a60ed2d36…
https://git.kernel.org/stable/c/4c253caf9264d2aa4…
https://git.kernel.org/stable/c/04ee31678c128a6cc…
https://git.kernel.org/stable/c/3219ac364ac3d8d30…
https://git.kernel.org/stable/c/9834b13e8b962caa2…
https://git.kernel.org/stable/c/18ca0d55e8639b911…
https://git.kernel.org/stable/c/b3c974501d0c32258…
https://git.kernel.org/stable/c/0bcf44903ef4df742…
https://git.kernel.org/stable/c/6b9dbedbe3499fef8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d83904cb2eb2c4d937eaf15032214b0578f25099 , < 4af21b12a60ed2d3642284f4f85b42d7dc6ac246 (git) Affected: deb1feaad03a78b545c949e54582ae57b3c56982 , < 4c253caf9264d2aa47ee806a87986dd8eb91a5d9 (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 04ee31678c128a6cc7bb057ea189a8624ba5a314 (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 3219ac364ac3d8d30771612a6010f1e0b7fa0a28 (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 9834b13e8b962caa28fbcf1f422dd82413da4ede (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 18ca0d55e8639b911df8aae1b47598b13f9acded (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < b3c974501d0c32258ae0e04e5cc3fb92383b40f6 (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 0bcf44903ef4df742dcada86ccaedd25374ffb50 (git) Affected: b6da31b2c07c46f2dcad1d86caa835227a16d9ff , < 6b9dbedbe3499fef862c4dff5217cf91f34e43b3 (git) Affected: 6d9cd12792270773fab9e5a129daff328d61ef9e (git) Affected: 6dbfa9b5ae65063cd61dc7fa11332e00bb794d8b (git) Affected: 60c4e8db32815474bfaeabe888ebb14e698caea1 (git) Affected: 4.9.117 , < 4.9.318 (semver) Affected: 4.14.60 , < 4.14.283 (semver) Affected: 3.18.118 , < 3.19 (semver) Affected: 4.4.146 , < 4.5 (semver) Affected: 4.17.12 , < 4.18 (semver)
Linux	Linux	Affected: 4.18 Unaffected: 0 , < 4.18 (semver) Unaffected: 4.9.318 , ≤ 4.9.* (semver) Unaffected: 4.14.283 , ≤ 4.14.* (semver) Unaffected: 4.19.247 , ≤ 4.19.* (semver) Unaffected: 5.4.198 , ≤ 5.4.* (semver) Unaffected: 5.10.121 , ≤ 5.10.* (semver) Unaffected: 5.15.46 , ≤ 5.15.* (semver) Unaffected: 5.17.14 , ≤ 5.17.* (semver) Unaffected: 5.18.3 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49441",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:40:56.105263Z",
                "version": "2.0.3"
              },
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            }
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        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-667",
                "description": "CWE-667 Improper Locking",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:46:49.473Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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          ]
        },
        {
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          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.121",
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            {
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.17.14",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                },
                {
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                {
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              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix deadlock caused by calling printk() under tty_port-\u003elock\n\npty_write() invokes kmalloc() which may invoke a normal printk() to print\nfailure message.  This can cause a deadlock in the scenario reported by\nsyz-bot below:\n\n       CPU0              CPU1                    CPU2\n       ----              ----                    ----\n                         lock(console_owner);\n                                                 lock(\u0026port_lock_key);\n  lock(\u0026port-\u003elock);\n                         lock(\u0026port_lock_key);\n                                                 lock(\u0026port-\u003elock);\n  lock(console_owner);\n\nAs commit dbdda842fe96 (\"printk: Add console owner and waiter logic to\nload balance console writes\") said, such deadlock can be prevented by\nusing printk_deferred() in kmalloc() (which is invoked in the section\nguarded by the port-\u003elock).  But there are too many printk() on the\nkmalloc() path, and kmalloc() can be called from anywhere, so changing\nprintk() to printk_deferred() is too complicated and inelegant.\n\nTherefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so\nthat printk() will not be called, and this deadlock problem can be\navoided.\n\nSyzbot reported the following lockdep error:\n\n======================================================\nWARNING: possible circular locking dependency detected\n5.4.143-00237-g08ccc19a-dirty #10 Not tainted\n------------------------------------------------------\nsyz-executor.4/29420 is trying to acquire lock:\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline]\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023\n\nbut task is already holding lock:\nffff8880119c9158 (\u0026port-\u003elock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #2 (\u0026port-\u003elock){-.-.}-{2:2}:\n       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n       _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n       tty_port_tty_get drivers/tty/tty_port.c:288 [inline]          \t\t\u003c-- lock(\u0026port-\u003elock);\n       tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47\n       serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767\n       serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854\n       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] \t\u003c-- lock(\u0026port_lock_key);\n       serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870\n       serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126\n       __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156\n       [...]\n\n-\u003e #1 (\u0026port_lock_key){-.-.}-{2:2}:\n       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n       _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n       serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198\n\t\t\t\t\t\t\t\t\t\t\u003c-- lock(\u0026port_lock_key);\n       call_console_drivers kernel/printk/printk.c:1819 [inline]\n       console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504\n       vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024\t\t\t\u003c-- lock(console_owner);\n       vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394\n       printk+0xba/0xed kernel/printk/printk.c:2084\n       register_console+0x8b3/0xc10 kernel/printk/printk.c:2829\n       univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681\n       console_init+0x49d/0x6d3 kernel/printk/printk.c:2915\n       start_kernel+0x5e9/0x879 init/main.c:713\n       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241\n\n-\u003e #0 (console_owner){....}-{0:0}:\n       [...]\n       lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734\n       console_trylock_spinning kernel/printk/printk.c:1773 \n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:22:17.184Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4af21b12a60ed2d3642284f4f85b42d7dc6ac246"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c253caf9264d2aa47ee806a87986dd8eb91a5d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/04ee31678c128a6cc7bb057ea189a8624ba5a314"
        },
        {
          "url": "https://git.kernel.org/stable/c/3219ac364ac3d8d30771612a6010f1e0b7fa0a28"
        },
        {
          "url": "https://git.kernel.org/stable/c/9834b13e8b962caa28fbcf1f422dd82413da4ede"
        },
        {
          "url": "https://git.kernel.org/stable/c/18ca0d55e8639b911df8aae1b47598b13f9acded"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3c974501d0c32258ae0e04e5cc3fb92383b40f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bcf44903ef4df742dcada86ccaedd25374ffb50"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b9dbedbe3499fef862c4dff5217cf91f34e43b3"
        }
      ],
      "title": "tty: fix deadlock caused by calling printk() under tty_port-\u003elock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49441",
    "datePublished": "2025-02-26T02:12:54.649Z",
    "dateReserved": "2025-02-26T02:08:31.570Z",
    "dateUpdated": "2026-05-23T15:22:17.184Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-320302

CVE-2022-49441 (GCVE-0-2022-49441)

Tags

Sightings

Nomenclature

Related by attack behaviour