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

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2026-05-23 15:22
VLAI
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
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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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---"
        }
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      "providerMetadata": {
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4af21b12a60ed2d3642284f4f85b42d7dc6ac246"
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        {
          "url": "https://git.kernel.org/stable/c/4c253caf9264d2aa47ee806a87986dd8eb91a5d9"
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        },
        {
          "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49441",
      "date": "2026-09-16",
      "epss": "0.00236",
      "percentile": "0.14815"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49441\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:20.523\",\"lastModified\":\"2026-06-17T05:18:03.463\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: se corrige el bloqueo causado por llamar a printk() bajo tty_port-\u0026gt;lock pty_write() invoca kmalloc() que puede invocar un printk() normal para imprimir un mensaje de error. Esto puede causar un bloqueo en el escenario informado por syz-bot a continuaci\u00f3n: CPU0 CPU1 CPU2 ---- ---- ---- lock(console_owner); lock(\u0026amp;port_lock_key); lock(\u0026amp;port-\u0026gt;lock); lock(\u0026amp;port_lock_key); lock(\u0026amp;port-\u0026gt;lock); lock(console_owner); Como dijo el commit dbdda842fe96 (\\\"printk: Agregar l\u00f3gica de propietario y espera de consola para equilibrar la carga de escrituras de consola\\\"), dicho bloqueo se puede prevenir usando printk_deferred() en kmalloc() (que se invoca en la secci\u00f3n protegida por port-\u0026gt;lock). Pero hay demasiados printk() en la ruta kmalloc() y kmalloc() se puede llamar desde cualquier lugar, por lo que cambiar printk() a printk_deferred() es demasiado complicado y poco elegante. Por lo tanto, este parche elige especificar __GFP_NOWARN en kmalloc(), de modo que no se llame a printk() y se pueda evitar este problema de bloqueo. Syzbot inform\u00f3 el siguiente error de lockdep: ======================================================== ADVERTENCIA: posible dependencia de bloqueo circular detectada 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 (\u0026amp;port-\u0026gt;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: -\u0026gt; #2 (\u0026amp;port-\u0026gt;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] \u0026lt;-- lock(\u0026amp;port-\u0026gt;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] \u0026lt;-- lock(\u0026amp;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 [...] -\u0026gt; #1 (\u0026amp;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 \u0026lt;-- lock(\u0026amp;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 \u0026lt;-- 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 -\u0026gt; #0 (console_owner){....}-{0:0}: [...] lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734 console_trylock_spinning kernel/printk/printk.c:1773 ---truncated--- 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:07:45+00:00",
      "cve": "CVE-2022-49441",
      "id": "CVE-2022-49441",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tty: fix deadlock caused by calling printk() under tty_port-\u003elock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49441.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:28:06Z",
      "cve": "CVE-2022-49441",
      "id": "CVE-2022-49441",
      "initial_release_date": "2025-02-27T03:06:51Z",
      "product_status:known_affected": "503",
      "product_status:known_not_affected": "180",
      "product_status:recommended": "330",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49441",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49441.json",
      "version": "61"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49441\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:40:56.105263Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-667\", \"description\": \"CWE-667 Improper Locking\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:47:04.809Z\"}}], \"cna\": {\"title\": \"tty: fix deadlock caused by calling printk() under tty_port-\u003elock\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d83904cb2eb2c4d937eaf15032214b0578f25099\", \"lessThan\": \"4af21b12a60ed2d3642284f4f85b42d7dc6ac246\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"deb1feaad03a78b545c949e54582ae57b3c56982\", \"lessThan\": \"4c253caf9264d2aa47ee806a87986dd8eb91a5d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"04ee31678c128a6cc7bb057ea189a8624ba5a314\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"3219ac364ac3d8d30771612a6010f1e0b7fa0a28\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"9834b13e8b962caa28fbcf1f422dd82413da4ede\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"18ca0d55e8639b911df8aae1b47598b13f9acded\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"b3c974501d0c32258ae0e04e5cc3fb92383b40f6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"0bcf44903ef4df742dcada86ccaedd25374ffb50\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b6da31b2c07c46f2dcad1d86caa835227a16d9ff\", \"lessThan\": \"6b9dbedbe3499fef862c4dff5217cf91f34e43b3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d9cd12792270773fab9e5a129daff328d61ef9e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6dbfa9b5ae65063cd61dc7fa11332e00bb794d8b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"60c4e8db32815474bfaeabe888ebb14e698caea1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.9.117\", \"lessThan\": \"4.9.318\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.60\", \"lessThan\": \"4.14.283\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.18.118\", \"lessThan\": \"3.19\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.4.146\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.17.12\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/tty/tty_buffer.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.318\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.283\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.121\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.18.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/tty_buffer.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.318\", \"versionStartIncluding\": \"4.9.117\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.283\", \"versionStartIncluding\": \"4.14.60\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.247\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.198\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.121\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.46\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.14\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.3\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.18.118\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.146\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.17.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:22:17.184Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49441\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:22:17.184Z\", \"dateReserved\": \"2025-02-26T02:08:31.570Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:12:54.649Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


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.