{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-52587", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52587", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-03-06T06:45:21.418Z", "updatedAt": "2026-05-11T19:29:51.510Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "IB/ipoib: Fix mcast list locking", "summary": "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--- ---\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 ,\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---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "4c8922ae8eb8dcc1e4b7d1059d97a8334288d825" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "615e3adc2042b7be4ad122a043fc9135e6342c90" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "ac2630fd3c90ffec34a0bfc4d413668538b0e8f2" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "ed790bd0903ed3352ebf7f650d910f49b7319b34" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "5108a2dc2db5630fb6cd58b8be80a0c134bc310a" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "342258fb46d66c1b4c7e2c3717ac01e10c03cf18" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "7c7bd4d561e9dc6f5b7df9e184974915f6701a89" }, { "version": "d2fe937ce6ce23daf5fb214e45432dbb631581b7", "status": "affected", "versionType": "git", "lessThan": "4f973e211b3b1c6d36f7c6a19239d258856749f9" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.1", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.1" }, { "version": "4.19.307", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.269", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.210", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.149", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.77", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.7.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.7.*" }, { "version": "6.8", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }