CVE-2022-48830 (GCVE-0-2022-48830)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:44 – Updated: 2026-08-05 08:52
VLAI
Title
can: isotp: fix potential CAN frame reception race in isotp_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix potential CAN frame reception race in isotp_rcv() When receiving a CAN frame the current code logic does not consider concurrently receiving processes which do not show up in real world usage. Ziyang Xuan writes: The following syz problem is one of the scenarios. so->rx.len is changed by isotp_rcv_ff() during isotp_rcv_cf(), so->rx.len equals 0 before alloc_skb() and equals 4096 after alloc_skb(). That will trigger skb_over_panic() in skb_put(). ======================================================= CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc8-syzkaller #0 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:113 Call Trace: <TASK> skb_over_panic net/core/skbuff.c:118 [inline] skb_put.cold+0x24/0x24 net/core/skbuff.c:1990 isotp_rcv_cf net/can/isotp.c:570 [inline] isotp_rcv+0xa38/0x1e30 net/can/isotp.c:668 deliver net/can/af_can.c:574 [inline] can_rcv_filter+0x445/0x8d0 net/can/af_can.c:635 can_receive+0x31d/0x580 net/can/af_can.c:665 can_rcv+0x120/0x1c0 net/can/af_can.c:696 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5465 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5579 Therefore we make sure the state changes and data structures stay consistent at CAN frame reception time by adding a spin_lock in isotp_rcv(). This fixes the issue reported by syzkaller but does not affect real world operation.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:57 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 7b53d2204ce79b27a878074a77d64f40ec21dbca (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < f90cc68f9f4b5d8585ad5d0a206a9d37ac299ef3 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 5b068f33bc8acfcfd5ea7992a2dafb30d89bad30 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 7c759040c1dd03954f650f147ae7175476d51314 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: isotp: corrige una posible ejecuci\u00f3n de recepci\u00f3n de tramas CAN en isotp_rcv() Al recibir una trama CAN, la l\u00f3gica del c\u00f3digo actual no considera la recepci\u00f3n simult\u00e1nea de procesos que no aparecen en el uso en el mundo real. Ziyang Xuan escribe: El siguiente problema syz es uno de los escenarios. so-\u0026gt;rx.len es cambiado por isotp_rcv_ff() durante isotp_rcv_cf(), so-\u0026gt;rx.len es igual a 0 antes de alloc_skb() y es igual a 4096 despu\u00e9s de alloc_skb(). Eso activar\u00e1 skb_over_panic() en skb_put(). ==================================================== ===== CPU: 1 PID: 19 Comm: ksoftirqd/1 No contaminado 5.16.0-rc8-syzkaller #0 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:113 Seguimiento de llamadas:  skb_over_panic net/core/skbuff.c:118 [en l\u00ednea] skb_put.cold+0x24/0x24 net/core/skbuff.c:1990 isotp_rcv_cf net/can/isotp.c:570 [en l\u00ednea] isotp_rcv+0xa38/0x1e30 net/ can/isotp.c:668 entregar net/can/af_can.c:574 [en l\u00ednea] can_rcv_filter+0x445/0x8d0 net/can/af_can.c:635 can_receive+0x31d/0x580 net/can/af_can.c:665 can_rcv+ 0x120/0x1c0 net/can/af_can.c:696 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5465 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5579 Por lo tanto, nos aseguramos de que los cambios de estado y las estructuras de datos mantenga la coherencia en el momento de recepci\u00f3n de la trama CAN agregando un spin_lock en isotp_rcv(). Esto soluciona el problema informado por syzkaller pero no afecta el funcionamiento en el mundo real."
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      "product_status:fixed": "303",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: isotp: fix potential CAN frame reception race in isotp_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48830.json",
      "version": "3"
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix potential CAN frame reception race in isotp_rcv()\n\nWhen receiving a CAN frame the current code logic does not consider\nconcurrently receiving processes which do not show up in real world\nusage.\n\nZiyang Xuan writes:\n\nThe following syz problem is one of the scenarios. so-\u003erx.len is\nchanged by isotp_rcv_ff() during isotp_rcv_cf(), so-\u003erx.len equals\n0 before alloc_skb() and equals 4096 after alloc_skb(). That will\ntrigger skb_over_panic() in skb_put().\n\n=======================================================\nCPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc8-syzkaller #0\nRIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:113\nCall Trace:\n \u003cTASK\u003e\n skb_over_panic net/core/skbuff.c:118 [inline]\n skb_put.cold+0x24/0x24 net/core/skbuff.c:1990\n isotp_rcv_cf net/can/isotp.c:570 [inline]\n isotp_rcv+0xa38/0x1e30 net/can/isotp.c:668\n deliver net/can/af_can.c:574 [inline]\n can_rcv_filter+0x445/0x8d0 net/can/af_can.c:635\n can_receive+0x31d/0x580 net/can/af_can.c:665\n can_rcv+0x120/0x1c0 net/can/af_can.c:696\n __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5465\n __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5579\n\nTherefore we make sure the state changes and data structures stay\nconsistent at CAN frame reception time by adding a spin_lock in\nisotp_rcv(). This fixes the issue reported by syzkaller but does not\naffect real world operation."
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                  "value": "AV:A - The bug is in isotp_rcv() on the SocketCAN receive path (can_rcv \u2192 can_receive \u2192 can_rcv_filter \u2192 deliver), reached when CAN frames matching a bound ISOTP rx_id arrive on the bus\u2014an adjacent shared-segment network like automotive/industrial CAN, analogous to Bluetooth.\nAC:L - The attacker controls both sides of the race by injecting concurrent First Frame and Consecutive Frame traffic for the same CAN ID so SMP softirq contexts run isotp_rcv_ff() and isotp_rcv_cf() in parallel, as syzkaller demonstrated; no attacker-uncontrollable condition is required.\nPR:N - Classic CAN/ISO-TP reception has no authentication; once a victim ISOTP socket is bound (normal for UDS/diagnostics), an unauthenticated bus peer can trigger the path with no host credentials or capabilities.\nUI:N - Frames are processed automatically in softirq once an ISOTP socket is bound and the CAN interface is up; no victim mount, open, or other interactive action is required.\nS:U - Corruption is confined to in-kernel ISOTP/socket heap state within the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - Concurrent isotp_rcv_ff() can inflate so-\u003erx.len past the fixed rx.buf[MAX_MSG_LENGTH+1] while isotp_rcv_cf() still writes, yielding a heap out-of-bounds access; under kernel OOB/memory-corruption guidance this supports high confidentiality impact.\nI:H - The same unlocked FF/CF race allows out-of-bounds writes into the embedded tpcon buffer and adjacent isotp_sock fields, a heap corruption primitive suitable for integrity/control-flow impact when scored conservatively.\nA:H - The documented race makes alloc_skb()/skb_put() use an inconsistent so-\u003erx.len and triggers skb_over_panic()/BUG in softirq, which is a full kernel availability failure that an adjacent peer can repeat at will."
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        "cveId": "CVE-2022-48830",
        "datePublished": "2024-07-16T11:44:13.987Z",
        "dateReserved": "2024-07-16T11:38:08.904Z",
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}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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