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vuln-cve/data/2023/52xxx/CVE-2023-52587.json
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{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2023-52587",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-03-02T21:55:42.570Z",
"datePublished": "2024-03-06T06:45:21.418Z",
"dateUpdated": "2026-05-11T19:29:51.510Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T19:29:51.510Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/ipoib: Fix mcast list locking\n\nReleasing the `priv->lock` while iterating the `priv->multicast_list` in\n`ipoib_mcast_join_task()` opens a window for `ipoib_mcast_dev_flush()` to\nremove the items while in the middle of iteration. If the mcast is removed\nwhile the lock was dropped, the for loop spins forever resulting in a hard\nlockup (as was reported on RHEL 4.18.0-372.75.1.el8_6 kernel):\n\n Task A (kworker/u72:2 below) | Task B (kworker/u72:0 below)\n -----------------------------------+-----------------------------------\n ipoib_mcast_join_task(work) | ipoib_ib_dev_flush_light(work)\n spin_lock_irq(&priv->lock) | __ipoib_ib_dev_flush(priv, ...)\n list_for_each_entry(mcast, | ipoib_mcast_dev_flush(dev = priv->dev)\n &priv->multicast_list, list) |\n ipoib_mcast_join(dev, mcast) |\n spin_unlock_irq(&priv->lock) |\n | spin_lock_irqsave(&priv->lock, flags)\n | list_for_each_entry_safe(mcast, tmcast,\n | &priv->multicast_list, list)\n | list_del(&mcast->list);\n | list_add_tail(&mcast->list, &remove_list)\n | spin_unlock_irqrestore(&priv->lock, flags)\n spin_lock_irq(&priv->lock) |\n | ipoib_mcast_remove_list(&remove_list)\n (Here, `mcast` is no longer on the | list_for_each_entry_safe(mcast, tmcast,\n `priv->multicast_list` and we keep | remove_list, list)\n spinning on the `remove_list` of | >>> wait_for_completion(&mcast->done)\n the other thread which is blocked |\n and the list is still valid on |\n it's stack.)\n\nFix this by keeping the lock held and changing to GFP_ATOMIC to prevent\neventual sleeps.\nUnfortunately we could not reproduce the lockup and confirm this fix but\nbased on the code review I think this fix should address such lockups.\n\ncrash> bc 31\nPID: 747 TASK: ff1c6a1a007e8000 CPU: 31 COMMAND: \"kworker/u72:2\"\n--\n [exception RIP: ipoib_mcast_join_task+0x1b1]\n RIP: ffffffffc0944ac1 RSP: ff646f199a8c7e00 RFLAGS: 00000002\n RAX: 0000000000000000 RBX: ff1c6a1a04dc82f8 RCX: 0000000000000000\n work (&priv->mcast_task{,.work})\n RDX: ff1c6a192d60ac68 RSI: 0000000000000286 RDI: ff1c6a1a04dc8000\n &mcast->list\n RBP: ff646f199a8c7e90 R8: ff1c699980019420 R9: ff1c6a1920c9a000\n R10: ff646f199a8c7e00 R11: ff1c6a191a7d9800 R12: ff1c6a192d60ac00\n mcast\n R13: ff1c6a1d82200000 R14: ff1c6a1a04dc8000 R15: ff1c6a1a04dc82d8\n dev priv (&priv->lock) &priv->multicast_list (aka head)\n ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018\n--- <NMI exception stack> ---\n #5 [ff646f199a8c7e00] ipoib_mcast_join_task+0x1b1 at ffffffffc0944ac1 [ib_ipoib]\n #6 [ff646f199a8c7e98] process_one_work+0x1a7 at ffffffff9bf10967\n\ncrash> rx ff646f199a8c7e68\nff646f199a8c7e68: ff1c6a1a04dc82f8 <<< work = &priv->mcast_task.work\n\ncrash> list -hO ipoib_dev_priv.multicast_list ff1c6a1a04dc8000\n(empty)\n\ncrash> ipoib_dev_priv.mcast_task.work.func,mcast_mutex.owner.counter ff1c6a1a04dc8000\n mcast_task.work.func = 0xffffffffc0944910 <ipoib_mcast_join_task>,\n mcast_mutex.owner.counter = 0xff1c69998efec000\n\ncrash> b 8\nPID: 8 TASK: ff1c69998efec000 CPU: 33 COMMAND: \"kworker/u72:0\"\n--\n #3 [ff646f1980153d50] wait_for_completion+0x96 at ffffffff9c7d7646\n #4 [ff646f1980153d90] ipoib_mcast_remove_list+0x56 at ffffffffc0944dc6 [ib_ipoib]\n #5 [ff646f1980153de8] ipoib_mcast_dev_flush+0x1a7 at ffffffffc09455a7 [ib_ipoib]\n #6 [ff646f1980153e58] __ipoib_ib_dev_flush+0x1a4 at ffffffffc09431a4 [ib_ipoib]\n #7 [ff\n---truncated---"
}
],
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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