CVE-2024-42271 (GCVE-0-2024-42271)
Vulnerability from cvelistv5
Published
2024-08-17 08:54
Modified
2026-05-11 20:29
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use after free in iucv_sock_close() iucv_sever_path() is called from process context and from bh context. iucv->path is used as indicator whether somebody else is taking care of severing the path (or it is already removed / never existed). This needs to be done with atomic compare and swap, otherwise there is a small window where iucv_sock_close() will try to work with a path that has already been severed and freed by iucv_callback_connrej() called by iucv_tasklet_fn(). Example: [452744.123844] Call Trace: [452744.123845] ([<0000001e87f03880>] 0x1e87f03880) [452744.123966] [<00000000d593001e>] iucv_path_sever+0x96/0x138 [452744.124330] [<000003ff801ddbca>] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336] [<000003ff801e01b6>] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [<000003ff801e08cc>] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] [<00000000d574794e>] __sock_release+0x5e/0xe8 [452744.124815] [<00000000d5747a0c>] sock_close+0x34/0x48 [452744.124820] [<00000000d5421642>] __fput+0xba/0x268 [452744.124826] [<00000000d51b382c>] task_work_run+0xbc/0xf0 [452744.124832] [<00000000d5145710>] do_notify_resume+0x88/0x90 [452744.124841] [<00000000d5978096>] system_call+0xe2/0x2c8 [452744.125319] Last Breaking-Event-Address: [452744.125321] [<00000000d5930018>] iucv_path_sever+0x90/0x138 [452744.125324] [452744.125325] Kernel panic - not syncing: Fatal exception in interrupt Note that bh_lock_sock() is not serializing the tasklet context against process context, because the check for sock_owned_by_user() and corresponding handling is missing. Ideas for a future clean-up patch: A) Correct usage of bh_lock_sock() in tasklet context, as described in Re-enqueue, if needed. This may require adding return values to the tasklet functions and thus changes to all users of iucv. B) Change iucv tasklet into worker and use only lock_sock() in af_iucv.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
Version: 7d316b9453523498246e9e19a659c423d4c5081e
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: fix use after free in iucv_sock_close()\n\niucv_sever_path() is called from process context and from bh context.\niucv-\u003epath is used as indicator whether somebody else is taking care of\nsevering the path (or it is already removed / never existed).\nThis needs to be done with atomic compare and swap, otherwise there is a\nsmall window where iucv_sock_close() will try to work with a path that has\nalready been severed and freed by iucv_callback_connrej() called by\niucv_tasklet_fn().\n\nExample:\n[452744.123844] Call Trace:\n[452744.123845] ([\u003c0000001e87f03880\u003e] 0x1e87f03880)\n[452744.123966]  [\u003c00000000d593001e\u003e] iucv_path_sever+0x96/0x138\n[452744.124330]  [\u003c000003ff801ddbca\u003e] iucv_sever_path+0xc2/0xd0 [af_iucv]\n[452744.124336]  [\u003c000003ff801e01b6\u003e] iucv_sock_close+0xa6/0x310 [af_iucv]\n[452744.124341]  [\u003c000003ff801e08cc\u003e] iucv_sock_release+0x3c/0xd0 [af_iucv]\n[452744.124345]  [\u003c00000000d574794e\u003e] __sock_release+0x5e/0xe8\n[452744.124815]  [\u003c00000000d5747a0c\u003e] sock_close+0x34/0x48\n[452744.124820]  [\u003c00000000d5421642\u003e] __fput+0xba/0x268\n[452744.124826]  [\u003c00000000d51b382c\u003e] task_work_run+0xbc/0xf0\n[452744.124832]  [\u003c00000000d5145710\u003e] do_notify_resume+0x88/0x90\n[452744.124841]  [\u003c00000000d5978096\u003e] system_call+0xe2/0x2c8\n[452744.125319] Last Breaking-Event-Address:\n[452744.125321]  [\u003c00000000d5930018\u003e] iucv_path_sever+0x90/0x138\n[452744.125324]\n[452744.125325] Kernel panic - not syncing: Fatal exception in interrupt\n\nNote that bh_lock_sock() is not serializing the tasklet context against\nprocess context, because the check for sock_owned_by_user() and\ncorresponding handling is missing.\n\nIdeas for a future clean-up patch:\nA) Correct usage of bh_lock_sock() in tasklet context, as described in\nRe-enqueue, if needed. This may require adding return values to the\ntasklet functions and thus changes to all users of iucv.\n\nB) Change iucv tasklet into worker and use only lock_sock() in af_iucv."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:29:07.496Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01"
        },
        {
          "url": "https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b424c9e44111c5a76f41c6b741f8d4c4179d876"
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        {
          "url": "https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84"
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        },
        {
          "url": "https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431"
        }
      ],
      "title": "net/iucv: fix use after free in iucv_sock_close()",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42271",
    "datePublished": "2024-08-17T08:54:26.048Z",
    "dateReserved": "2024-07-30T07:40:12.260Z",
    "dateUpdated": "2026-05-11T20:29:07.496Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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