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CVE-2022-49916

Estado: ModificadaMedia (5.5)—

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

rose: Fix NULL pointer dereference in rose_send_frame()

The syzkaller reported an issue:

It triggers NULL pointer dereference when 'neigh->dev->dev_addr' is called in the rose_send_frame(). It's the first occurrence of the `neigh` is in rose_loopback_timer() as `rose_loopback_neigh', and the 'dev' in 'rose_loopback_neigh' is initialized sa nullptr.

It had been fixed by commit 3b3fd068c56e3fbea30090859216a368398e39bf ("rose: Fix Null pointer dereference in rose_send_frame()") ever. But it's introduced by commit 3c53cd65dece47dd1f9d3a809f32e59d1d87b2b8 ("rose: check NULL rose_loopback_neigh->loopback") again.

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We fix it by add NULL check in rose_transmit_clear_request(). When the 'dev' in 'neigh' is NULL, we don't reply the request and just clear it.

syzkaller don't provide repro, and I provide a syz repro like: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000180)={'rose0\x00', 0x201}) r1 = syz_init_net_socket$rose(0xb, 0x5, 0x0) bind$rose(r1, &(0x7f00000000c0)=@full={0xb, @dev, @null, 0x0, [@null, @null, @netrom, @netrom, @default, @null]}, 0x40) connect$rose(r1, &(0x7f0000000240)=@short={0xb, @dev={0xbb, 0xbb, 0xbb, 0x1, 0x0}, @remote={0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x1}, 0x1, @netrom={0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0x0, 0x0}}, 0x1c)

Detalles técnicos trazas, registros y código del informe original
KASAN: null-ptr-deref in range [0x0000000000000380-0x0000000000000387]
CPU: 0 PID: 4069 Comm: kworker/0:15 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: rcu_gp srcu_invoke_callbacks
RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101
Call Trace:
 <IRQ>
 rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255
 rose_rx_call_request+0x4c0/0x1bc0 net/rose/af_rose.c:1009
 rose_loopback_timer+0x19e/0x590 net/rose/rose_loopback.c:111
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d0/0x9c8 kernel/softirq.c:571
 [...]
 </IRQ>

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2022-49916",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
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          "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",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrose: Fix NULL pointer dereference in rose_send_frame()\n\nThe syzkaller reported an issue:\n\nKASAN: null-ptr-deref in range [0x0000000000000380-0x0000000000000387]\nCPU: 0 PID: 4069 Comm: kworker/0:15 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: rcu_gp srcu_invoke_callbacks\nRIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101\nCall Trace:\n <IRQ>\n rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255\n rose_rx_call_request+0x4c0/0x1bc0 net/rose/af_rose.c:1009\n rose_loopback_timer+0x19e/0x590 net/rose/rose_loopback.c:111\n call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474\n expire_timers kernel/time/timer.c:1519 [inline]\n __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790\n __run_timers kernel/time/timer.c:1768 [inline]\n run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803\n __do_softirq+0x1d0/0x9c8 kernel/softirq.c:571\n [...]\n </IRQ>\n\nIt triggers NULL pointer dereference when 'neigh->dev->dev_addr' is\ncalled in the rose_send_frame(). It's the first occurrence of the\n`neigh` is in rose_loopback_timer() as `rose_loopback_neigh', and\nthe 'dev' in 'rose_loopback_neigh' is initialized sa nullptr.\n\nIt had been fixed by commit 3b3fd068c56e3fbea30090859216a368398e39bf\n(\"rose: Fix Null pointer dereference in rose_send_frame()\") ever.\nBut it's introduced by commit 3c53cd65dece47dd1f9d3a809f32e59d1d87b2b8\n(\"rose: check NULL rose_loopback_neigh->loopback\") again.\n\nWe fix it by add NULL check in rose_transmit_clear_request(). When\nthe 'dev' in 'neigh' is NULL, we don't reply the request and just\nclear it.\n\nsyzkaller don't provide repro, and I provide a syz repro like:\nr0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2)\nioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000180)={'rose0\\x00', 0x201})\nr1 = syz_init_net_socket$rose(0xb, 0x5, 0x0)\nbind$rose(r1, &(0x7f00000000c0)=@full={0xb, @dev, @null, 0x0, [@null, @null, @netrom, @netrom, @default, @null]}, 0x40)\nconnect$rose(r1, &(0x7f0000000240)=@short={0xb, @dev={0xbb, 0xbb, 0xbb, 0x1, 0x0}, @remote={0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x1}, 0x1, @netrom={0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0x0, 0x0}}, 0x1c)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rose: Se corrige la desreferencia del puntero NULL en rose_send_frame() Syzkaller informó un problema: KASAN: null-ptr-deref en el rango [0x0000000000000380-0x0000000000000387] CPU: 0 PID: 4069 Comm: kworker/0:15 No contaminado 6.0.0-syzkaller-02734-g0326074ff465 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 22/09/2022 Cola de trabajo: rcu_gp srcu_invoke_callbacks RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101 Rastreo de llamadas:  rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x4c0/0x1bc0 net/rose/af_rose.c:1009 rose_loopback_timer+0x19e/0x590 net/rose/rose_loopback.c:111 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [en línea] __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [en línea] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1d0/0x9c8 kernel/softirq.c:571 [...]  Activa la desreferencia de puntero nulo cuando se llama a 'neigh-&gt;dev-&gt;dev_addr' en rose_send_frame(). Es la primera vez que `neigh` aparece en rose_loopback_timer() como `rose_loopback_neigh', y `dev' en `rose_loopback_neigh' se inicializa como nullptr. Se corrigió con el commit 3b3fd068c56e3fbea30090859216a368398e39bf (\"rose: Corregir la desreferencia de puntero nulo en rose_send_frame()\"). Pero esto se introduce de nuevo con el commit 3c53cd65dece47dd1f9d3a809f32e59d1d87b2b8 (\"rose: check NULL rose_loopback_neigh-&gt;loopback\"). Lo solucionamos añadiendo una comprobación NULL en rose_transmit_clear_request(). Cuando el valor de \"dev\" en \"neigh\" es NULL, no respondemos a la solicitud y simplemente la borramos. syzkaller no proporciona reproducción, y yo proporciono una reproducción syz como: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &amp;(0x7f0000000180)={'rose0\\x00', 0x201}) r1 = syz_init_net_socket$rose(0xb, 0x5, 0x0) bind$rose(r1, &amp;(0x7f00000000c0)=@full={0xb, @dev, @null, 0x0, [@null, @null, @netrom, @netrom, @default, @null]}, 0x40) conectar$rosa(r1, &amp;(0x7f0000000240)=@corto={0xb, @dev={0xbb, 0xbb, 0xbb, 0x1, 0x0}, @remoto={0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x1}, 0x1, @netrom={0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0x0, 0x0}}, 0x1c)"
    }
  ],
  "lastModified": "2026-06-17T05:19:30.343",
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