CVE-2022-49687 (GCVE-0-2022-49687)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-05-04 08:43
VLAI?
Title
virtio_net: fix xdp_rxq_info bug after suspend/resume
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio_net: fix xdp_rxq_info bug after suspend/resume The following sequence currently causes a driver bug warning when using virtio_net: # ip link set eth0 up # echo mem > /sys/power/state (or e.g. # rtcwake -s 10 -m mem) <resume> # ip link set eth0 down Missing register, driver bug WARNING: CPU: 0 PID: 375 at net/core/xdp.c:138 xdp_rxq_info_unreg+0x58/0x60 Call trace: xdp_rxq_info_unreg+0x58/0x60 virtnet_close+0x58/0xac __dev_close_many+0xac/0x140 __dev_change_flags+0xd8/0x210 dev_change_flags+0x24/0x64 do_setlink+0x230/0xdd0 ... This happens because virtnet_freeze() frees the receive_queue completely (including struct xdp_rxq_info) but does not call xdp_rxq_info_unreg(). Similarly, virtnet_restore() sets up the receive_queue again but does not call xdp_rxq_info_reg(). Actually, parts of virtnet_freeze_down() and virtnet_restore_up() are almost identical to virtnet_close() and virtnet_open(): only the calls to xdp_rxq_info_(un)reg() are missing. This means that we can fix this easily and avoid such problems in the future by just calling virtnet_close()/open() from the freeze/restore handlers. Aside from adding the missing xdp_rxq_info calls the only difference is that the refill work is only cancelled if netif_running(). However, this should not make any functional difference since the refill work should only be active if the network interface is actually up.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 9222672fa6370f0ec3d899662cb8680e9282fc4c (git)
Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 8c7a32b7c15555beddc5810c3334d9cefff061bf (git)
Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 340fbdc8011f2dc678f622c5ce1cbb5ab8305de7 (git)
Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 8d7fe9ad6fddc2af8bde4b921b4f8fab231ed38c (git)
Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 57ee40f1b198b59d43c216fbc4672f9300d3c8b0 (git)
Affected: 754b8a21a96d5f11712245aef907149606b323ae , < 8af52fe9fd3bf5e7478da99193c0632276e1dfce (git)
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    Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.19.250 , ≤ 4.19.* (semver)
Unaffected: 5.4.202 , ≤ 5.4.* (semver)
Unaffected: 5.10.127 , ≤ 5.10.* (semver)
Unaffected: 5.15.51 , ≤ 5.15.* (semver)
Unaffected: 5.18.8 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_net: fix xdp_rxq_info bug after suspend/resume\n\nThe following sequence currently causes a driver bug warning\nwhen using virtio_net:\n\n  # ip link set eth0 up\n  # echo mem \u003e /sys/power/state (or e.g. # rtcwake -s 10 -m mem)\n  \u003cresume\u003e\n  # ip link set eth0 down\n\n  Missing register, driver bug\n  WARNING: CPU: 0 PID: 375 at net/core/xdp.c:138 xdp_rxq_info_unreg+0x58/0x60\n  Call trace:\n   xdp_rxq_info_unreg+0x58/0x60\n   virtnet_close+0x58/0xac\n   __dev_close_many+0xac/0x140\n   __dev_change_flags+0xd8/0x210\n   dev_change_flags+0x24/0x64\n   do_setlink+0x230/0xdd0\n   ...\n\nThis happens because virtnet_freeze() frees the receive_queue\ncompletely (including struct xdp_rxq_info) but does not call\nxdp_rxq_info_unreg(). Similarly, virtnet_restore() sets up the\nreceive_queue again but does not call xdp_rxq_info_reg().\n\nActually, parts of virtnet_freeze_down() and virtnet_restore_up()\nare almost identical to virtnet_close() and virtnet_open(): only\nthe calls to xdp_rxq_info_(un)reg() are missing. This means that\nwe can fix this easily and avoid such problems in the future by\njust calling virtnet_close()/open() from the freeze/restore handlers.\n\nAside from adding the missing xdp_rxq_info calls the only difference\nis that the refill work is only cancelled if netif_running(). However,\nthis should not make any functional difference since the refill work\nshould only be active if the network interface is actually up."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:43:19.791Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9222672fa6370f0ec3d899662cb8680e9282fc4c"
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          "url": "https://git.kernel.org/stable/c/8c7a32b7c15555beddc5810c3334d9cefff061bf"
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        {
          "url": "https://git.kernel.org/stable/c/8af52fe9fd3bf5e7478da99193c0632276e1dfce"
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      "title": "virtio_net: fix xdp_rxq_info bug after suspend/resume",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49687",
    "datePublished": "2025-02-26T02:24:13.187Z",
    "dateReserved": "2025-02-26T02:21:30.441Z",
    "dateUpdated": "2025-05-04T08:43:19.791Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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