CVE-2022-49201 (GCVE-0-2022-49201)
Vulnerability from cvelistv5
Published
2025-02-26 01:55
Modified
2026-08-05 08:54
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ibmvnic: fix race between xmit and reset There is a race between reset and the transmit paths that can lead to ibmvnic_xmit() accessing an scrq after it has been freed in the reset path. It can result in a crash like: Kernel attempted to read user page (0) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000000 Faulting instruction address: 0xc0080000016189f8 Oops: Kernel access of bad area, sig: 11 [#1] ... NIP [c0080000016189f8] ibmvnic_xmit+0x60/0xb60 [ibmvnic] LR [c000000000c0046c] dev_hard_start_xmit+0x11c/0x280 Call Trace: [c008000001618f08] ibmvnic_xmit+0x570/0xb60 [ibmvnic] (unreliable) [c000000000c0046c] dev_hard_start_xmit+0x11c/0x280 [c000000000c9cfcc] sch_direct_xmit+0xec/0x330 [c000000000bfe640] __dev_xmit_skb+0x3a0/0x9d0 [c000000000c00ad4] __dev_queue_xmit+0x394/0x730 [c008000002db813c] __bond_start_xmit+0x254/0x450 [bonding] [c008000002db8378] bond_start_xmit+0x40/0xc0 [bonding] [c000000000c0046c] dev_hard_start_xmit+0x11c/0x280 [c000000000c00ca4] __dev_queue_xmit+0x564/0x730 [c000000000cf97e0] neigh_hh_output+0xd0/0x180 [c000000000cfa69c] ip_finish_output2+0x31c/0x5c0 [c000000000cfd244] __ip_queue_xmit+0x194/0x4f0 [c000000000d2a3c4] __tcp_transmit_skb+0x434/0x9b0 [c000000000d2d1e0] __tcp_retransmit_skb+0x1d0/0x6a0 [c000000000d2d984] tcp_retransmit_skb+0x34/0x130 [c000000000d310e8] tcp_retransmit_timer+0x388/0x6d0 [c000000000d315ec] tcp_write_timer_handler+0x1bc/0x330 [c000000000d317bc] tcp_write_timer+0x5c/0x200 [c000000000243270] call_timer_fn+0x50/0x1c0 [c000000000243704] __run_timers.part.0+0x324/0x460 [c000000000243894] run_timer_softirq+0x54/0xa0 [c000000000ea713c] __do_softirq+0x15c/0x3e0 [c000000000166258] __irq_exit_rcu+0x158/0x190 [c000000000166420] irq_exit+0x20/0x40 [c00000000002853c] timer_interrupt+0x14c/0x2b0 [c000000000009a00] decrementer_common_virt+0x210/0x220 --- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c The immediate cause of the crash is the access of tx_scrq in the following snippet during a reset, where the tx_scrq can be either NULL or an address that will soon be invalid: ibmvnic_xmit() { ... tx_scrq = adapter->tx_scrq[queue_num]; txq = netdev_get_tx_queue(netdev, queue_num); ind_bufp = &tx_scrq->ind_buf; if (test_bit(0, &adapter->resetting)) { ... } But beyond that, the call to ibmvnic_xmit() itself is not safe during a reset and the reset path attempts to avoid this by stopping the queue in ibmvnic_cleanup(). However just after the queue was stopped, an in-flight ibmvnic_complete_tx() could have restarted the queue even as the reset is progressing. Since the queue was restarted we could get a call to ibmvnic_xmit() which can then access the bad tx_scrq (or other fields). We cannot however simply have ibmvnic_complete_tx() check the ->resetting bit and skip starting the queue. This can race at the "back-end" of a good reset which just restarted the queue but has not cleared the ->resetting bit yet. If we skip restarting the queue due to ->resetting being true, the queue would remain stopped indefinitely potentially leading to transmit timeouts. IOW ->resetting is too broad for this purpose. Instead use a new flag that indicates whether or not the queues are active. Only the open/ reset paths control when the queues are active. ibmvnic_complete_tx() and others wake up the queue only if the queue is marked active. So we will have: A. reset/open thread in ibmvnic_cleanup() and __ibmvnic_open() ->resetting = true ->tx_queues_active = false disable tx queues ... ->tx_queues_active = true start tx queues B. Tx interrupt in ibmvnic_complete_tx(): if (->tx_queues_active) netif_wake_subqueue(); To ensure that ->tx_queues_active and state of the queues are consistent, we need a lock which: - must also be taken in the interrupt path (ibmvnic_complete_tx()) - shared across the multiple ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 7ed5b31f4a6695a21f617df07646e9b15c6c1d29
Version: 7ed5b31f4a6695a21f617df07646e9b15c6c1d29
Version: 7ed5b31f4a6695a21f617df07646e9b15c6c1d29
Version: 7ed5b31f4a6695a21f617df07646e9b15c6c1d29
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              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
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              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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                "id": "CVE-2022-49201",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: fix race between xmit and reset\n\nThere is a race between reset and the transmit paths that can lead to\nibmvnic_xmit() accessing an scrq after it has been freed in the reset\npath. It can result in a crash like:\n\n\tKernel attempted to read user page (0) - exploit attempt? (uid: 0)\n\tBUG: Kernel NULL pointer dereference on read at 0x00000000\n\tFaulting instruction address: 0xc0080000016189f8\n\tOops: Kernel access of bad area, sig: 11 [#1]\n\t...\n\tNIP [c0080000016189f8] ibmvnic_xmit+0x60/0xb60 [ibmvnic]\n\tLR [c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\n\tCall Trace:\n\t[c008000001618f08] ibmvnic_xmit+0x570/0xb60 [ibmvnic] (unreliable)\n\t[c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\n\t[c000000000c9cfcc] sch_direct_xmit+0xec/0x330\n\t[c000000000bfe640] __dev_xmit_skb+0x3a0/0x9d0\n\t[c000000000c00ad4] __dev_queue_xmit+0x394/0x730\n\t[c008000002db813c] __bond_start_xmit+0x254/0x450 [bonding]\n\t[c008000002db8378] bond_start_xmit+0x40/0xc0 [bonding]\n\t[c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\n\t[c000000000c00ca4] __dev_queue_xmit+0x564/0x730\n\t[c000000000cf97e0] neigh_hh_output+0xd0/0x180\n\t[c000000000cfa69c] ip_finish_output2+0x31c/0x5c0\n\t[c000000000cfd244] __ip_queue_xmit+0x194/0x4f0\n\t[c000000000d2a3c4] __tcp_transmit_skb+0x434/0x9b0\n\t[c000000000d2d1e0] __tcp_retransmit_skb+0x1d0/0x6a0\n\t[c000000000d2d984] tcp_retransmit_skb+0x34/0x130\n\t[c000000000d310e8] tcp_retransmit_timer+0x388/0x6d0\n\t[c000000000d315ec] tcp_write_timer_handler+0x1bc/0x330\n\t[c000000000d317bc] tcp_write_timer+0x5c/0x200\n\t[c000000000243270] call_timer_fn+0x50/0x1c0\n\t[c000000000243704] __run_timers.part.0+0x324/0x460\n\t[c000000000243894] run_timer_softirq+0x54/0xa0\n\t[c000000000ea713c] __do_softirq+0x15c/0x3e0\n\t[c000000000166258] __irq_exit_rcu+0x158/0x190\n\t[c000000000166420] irq_exit+0x20/0x40\n\t[c00000000002853c] timer_interrupt+0x14c/0x2b0\n\t[c000000000009a00] decrementer_common_virt+0x210/0x220\n\t--- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c\n\nThe immediate cause of the crash is the access of tx_scrq in the following\nsnippet during a reset, where the tx_scrq can be either NULL or an address\nthat will soon be invalid:\n\n\tibmvnic_xmit()\n\t{\n\t\t...\n\t\ttx_scrq = adapter-\u003etx_scrq[queue_num];\n\t\ttxq = netdev_get_tx_queue(netdev, queue_num);\n\t\tind_bufp = \u0026tx_scrq-\u003eind_buf;\n\n\t\tif (test_bit(0, \u0026adapter-\u003eresetting)) {\n\t\t...\n\t}\n\nBut beyond that, the call to ibmvnic_xmit() itself is not safe during a\nreset and the reset path attempts to avoid this by stopping the queue in\nibmvnic_cleanup(). However just after the queue was stopped, an in-flight\nibmvnic_complete_tx() could have restarted the queue even as the reset is\nprogressing.\n\nSince the queue was restarted we could get a call to ibmvnic_xmit() which\ncan then access the bad tx_scrq (or other fields).\n\nWe cannot however simply have ibmvnic_complete_tx() check the -\u003eresetting\nbit and skip starting the queue. This can race at the \"back-end\" of a good\nreset which just restarted the queue but has not cleared the -\u003eresetting\nbit yet. If we skip restarting the queue due to -\u003eresetting being true,\nthe queue would remain stopped indefinitely potentially leading to transmit\ntimeouts.\n\nIOW -\u003eresetting is too broad for this purpose. Instead use a new flag\nthat indicates whether or not the queues are active. Only the open/\nreset paths control when the queues are active. ibmvnic_complete_tx()\nand others wake up the queue only if the queue is marked active.\n\nSo we will have:\n\tA. reset/open thread in ibmvnic_cleanup() and __ibmvnic_open()\n\n\t\t-\u003eresetting = true\n\t\t-\u003etx_queues_active = false\n\t\tdisable tx queues\n\t\t...\n\t\t-\u003etx_queues_active = true\n\t\tstart tx queues\n\n\tB. Tx interrupt in ibmvnic_complete_tx():\n\n\t\tif (-\u003etx_queues_active)\n\t\t\tnetif_wake_subqueue();\n\nTo ensure that -\u003etx_queues_active and state of the queues are consistent,\nwe need a lock which:\n\n\t- must also be taken in the interrupt path (ibmvnic_complete_tx())\n\t- shared across the multiple\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ibmvnic_xmit is the ndo_start_xmit path for every outbound frame on PowerVM LPAR vnics; an unauthenticated remote peer reaches it by eliciting kernel replies (TCP/ICMP/ARP), consistent with prior ibmvnic TX CVEs (CVE-2025-21855, CVE-2024-41066, CVE-2023-53463).\nAC:L - A remote attacker can saturate the interface to trip ibmvnic_tx_timeout (VNIC_RESET_TIMEOUT) and, on failure, force_reset_recovery \u2192 do_hard_reset which release_sub_crqs-frees the scrq, while continuing to drive TX completions/xmit\u2014controlling both the reset trigger and the traffic side of the race.\nPR:N - No credential, capability, or authentication check sits between received traffic that elicits transmit and ibmvnic_xmit; the reset/watchdog path likewise requires no attacker privileges.\nUI:N - Exploitation is driven entirely by attacker-generated network load and the resulting driver reset/TX completion activity; no victim user or admin action is required.\nS:U - The UAF/crash is confined to the affected LPAR kernel\u2019s own memory and does not cross into the VIOS, hypervisor, or other partitions.\nC:H - The fix describes use of an scrq after free (kfree\u2019d ibmvnic_sub_crq_queue); per UAF scoring guidance that enables disclosure of reclaimed heap contents, not merely a crash.\nI:H - A dangling tx_scrq lets ibmvnic_xmit continue writing through ind_buf and related queue fields into attacker-reclaimable slab memory, yielding a heap corruption / control-flow primitive under the UAF integrity rule.\nA:H - The documented outcome is a kernel NULL pointer dereference oops in ibmvnic_xmit during reset, and any UAF in this path can likewise fault\u2014both are full availability impact."
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:54:22.016Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1bd58abf595b6cf1ba6dd47ec887c4c009155fc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/475f9cce98b63bc145b4efa66fa51175d4cb345f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8507c6ade73cdbbbda5c3d31d67f52f2e1cf03fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/4219196d1f662cb10a462eb9e076633a3fc31a15"
        }
      ],
      "title": "ibmvnic: fix race between xmit and reset",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49201",
    "datePublished": "2025-02-26T01:55:43.263Z",
    "dateReserved": "2025-02-26T01:49:39.291Z",
    "dateUpdated": "2026-08-05T08:54:22.016Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.7, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49201\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:47:15.276230Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:08:59.190Z\"}}], \"cna\": {\"title\": \"ibmvnic: fix race between xmit and reset\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - ibmvnic_xmit is the ndo_start_xmit path for every outbound frame on PowerVM LPAR vnics; an unauthenticated remote peer reaches it by eliciting kernel replies (TCP/ICMP/ARP), consistent with prior ibmvnic TX CVEs (CVE-2025-21855, CVE-2024-41066, CVE-2023-53463).\\nAC:L - A remote attacker can saturate the interface to trip ibmvnic_tx_timeout (VNIC_RESET_TIMEOUT) and, on failure, force_reset_recovery \\u2192 do_hard_reset which release_sub_crqs-frees the scrq, while continuing to drive TX completions/xmit\\u2014controlling both the reset trigger and the traffic side of the race.\\nPR:N - No credential, capability, or authentication check sits between received traffic that elicits transmit and ibmvnic_xmit; the reset/watchdog path likewise requires no attacker privileges.\\nUI:N - Exploitation is driven entirely by attacker-generated network load and the resulting driver reset/TX completion activity; no victim user or admin action is required.\\nS:U - The UAF/crash is confined to the affected LPAR kernel\\u2019s own memory and does not cross into the VIOS, hypervisor, or other partitions.\\nC:H - The fix describes use of an scrq after free (kfree\\u2019d ibmvnic_sub_crq_queue); per UAF scoring guidance that enables disclosure of reclaimed heap contents, not merely a crash.\\nI:H - A dangling tx_scrq lets ibmvnic_xmit continue writing through ind_buf and related queue fields into attacker-reclaimable slab memory, yielding a heap corruption / control-flow primitive under the UAF integrity rule.\\nA:H - The documented outcome is a kernel NULL pointer dereference oops in ibmvnic_xmit during reset, and any UAF in this path can likewise fault\\u2014both are full availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7ed5b31f4a6695a21f617df07646e9b15c6c1d29\", \"lessThan\": \"1bd58abf595b6cf1ba6dd47ec887c4c009155fc9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7ed5b31f4a6695a21f617df07646e9b15c6c1d29\", \"lessThan\": \"475f9cce98b63bc145b4efa66fa51175d4cb345f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7ed5b31f4a6695a21f617df07646e9b15c6c1d29\", \"lessThan\": \"8507c6ade73cdbbbda5c3d31d67f52f2e1cf03fe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7ed5b31f4a6695a21f617df07646e9b15c6c1d29\", \"lessThan\": \"4219196d1f662cb10a462eb9e076633a3fc31a15\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/ethernet/ibm/ibmvnic.c\", \"drivers/net/ethernet/ibm/ibmvnic.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/ibm/ibmvnic.c\", \"drivers/net/ethernet/ibm/ibmvnic.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1bd58abf595b6cf1ba6dd47ec887c4c009155fc9\"}, {\"url\": \"https://git.kernel.org/stable/c/475f9cce98b63bc145b4efa66fa51175d4cb345f\"}, {\"url\": \"https://git.kernel.org/stable/c/8507c6ade73cdbbbda5c3d31d67f52f2e1cf03fe\"}, {\"url\": \"https://git.kernel.org/stable/c/4219196d1f662cb10a462eb9e076633a3fc31a15\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nibmvnic: fix race between xmit and reset\\n\\nThere is a race between reset and the transmit paths that can lead to\\nibmvnic_xmit() accessing an scrq after it has been freed in the reset\\npath. It can result in a crash like:\\n\\n\\tKernel attempted to read user page (0) - exploit attempt? (uid: 0)\\n\\tBUG: Kernel NULL pointer dereference on read at 0x00000000\\n\\tFaulting instruction address: 0xc0080000016189f8\\n\\tOops: Kernel access of bad area, sig: 11 [#1]\\n\\t...\\n\\tNIP [c0080000016189f8] ibmvnic_xmit+0x60/0xb60 [ibmvnic]\\n\\tLR [c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\\n\\tCall Trace:\\n\\t[c008000001618f08] ibmvnic_xmit+0x570/0xb60 [ibmvnic] (unreliable)\\n\\t[c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\\n\\t[c000000000c9cfcc] sch_direct_xmit+0xec/0x330\\n\\t[c000000000bfe640] __dev_xmit_skb+0x3a0/0x9d0\\n\\t[c000000000c00ad4] __dev_queue_xmit+0x394/0x730\\n\\t[c008000002db813c] __bond_start_xmit+0x254/0x450 [bonding]\\n\\t[c008000002db8378] bond_start_xmit+0x40/0xc0 [bonding]\\n\\t[c000000000c0046c] dev_hard_start_xmit+0x11c/0x280\\n\\t[c000000000c00ca4] __dev_queue_xmit+0x564/0x730\\n\\t[c000000000cf97e0] neigh_hh_output+0xd0/0x180\\n\\t[c000000000cfa69c] ip_finish_output2+0x31c/0x5c0\\n\\t[c000000000cfd244] __ip_queue_xmit+0x194/0x4f0\\n\\t[c000000000d2a3c4] __tcp_transmit_skb+0x434/0x9b0\\n\\t[c000000000d2d1e0] __tcp_retransmit_skb+0x1d0/0x6a0\\n\\t[c000000000d2d984] tcp_retransmit_skb+0x34/0x130\\n\\t[c000000000d310e8] tcp_retransmit_timer+0x388/0x6d0\\n\\t[c000000000d315ec] tcp_write_timer_handler+0x1bc/0x330\\n\\t[c000000000d317bc] tcp_write_timer+0x5c/0x200\\n\\t[c000000000243270] call_timer_fn+0x50/0x1c0\\n\\t[c000000000243704] __run_timers.part.0+0x324/0x460\\n\\t[c000000000243894] run_timer_softirq+0x54/0xa0\\n\\t[c000000000ea713c] __do_softirq+0x15c/0x3e0\\n\\t[c000000000166258] __irq_exit_rcu+0x158/0x190\\n\\t[c000000000166420] irq_exit+0x20/0x40\\n\\t[c00000000002853c] timer_interrupt+0x14c/0x2b0\\n\\t[c000000000009a00] decrementer_common_virt+0x210/0x220\\n\\t--- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c\\n\\nThe immediate cause of the crash is the access of tx_scrq in the following\\nsnippet during a reset, where the tx_scrq can be either NULL or an address\\nthat will soon be invalid:\\n\\n\\tibmvnic_xmit()\\n\\t{\\n\\t\\t...\\n\\t\\ttx_scrq = adapter-\u003etx_scrq[queue_num];\\n\\t\\ttxq = netdev_get_tx_queue(netdev, queue_num);\\n\\t\\tind_bufp = \u0026tx_scrq-\u003eind_buf;\\n\\n\\t\\tif (test_bit(0, \u0026adapter-\u003eresetting)) {\\n\\t\\t...\\n\\t}\\n\\nBut beyond that, the call to ibmvnic_xmit() itself is not safe during a\\nreset and the reset path attempts to avoid this by stopping the queue in\\nibmvnic_cleanup(). However just after the queue was stopped, an in-flight\\nibmvnic_complete_tx() could have restarted the queue even as the reset is\\nprogressing.\\n\\nSince the queue was restarted we could get a call to ibmvnic_xmit() which\\ncan then access the bad tx_scrq (or other fields).\\n\\nWe cannot however simply have ibmvnic_complete_tx() check the -\u003eresetting\\nbit and skip starting the queue. This can race at the \\\"back-end\\\" of a good\\nreset which just restarted the queue but has not cleared the -\u003eresetting\\nbit yet. If we skip restarting the queue due to -\u003eresetting being true,\\nthe queue would remain stopped indefinitely potentially leading to transmit\\ntimeouts.\\n\\nIOW -\u003eresetting is too broad for this purpose. Instead use a new flag\\nthat indicates whether or not the queues are active. Only the open/\\nreset paths control when the queues are active. ibmvnic_complete_tx()\\nand others wake up the queue only if the queue is marked active.\\n\\nSo we will have:\\n\\tA. reset/open thread in ibmvnic_cleanup() and __ibmvnic_open()\\n\\n\\t\\t-\u003eresetting = true\\n\\t\\t-\u003etx_queues_active = false\\n\\t\\tdisable tx queues\\n\\t\\t...\\n\\t\\t-\u003etx_queues_active = true\\n\\t\\tstart tx queues\\n\\n\\tB. Tx interrupt in ibmvnic_complete_tx():\\n\\n\\t\\tif (-\u003etx_queues_active)\\n\\t\\t\\tnetif_wake_subqueue();\\n\\nTo ensure that -\u003etx_queues_active and state of the queues are consistent,\\nwe need a lock which:\\n\\n\\t- must also be taken in the interrupt path (ibmvnic_complete_tx())\\n\\t- shared across the multiple\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"5.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:54:22.016Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49201\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:54:22.016Z\", \"dateReserved\": \"2025-02-26T01:49:39.291Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:55:43.263Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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