CVE-2024-49936

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No remote packet path reaches `xenvif_flush_hash()`.\nAC:L - A malicious guest fully controls both sides: it can keep the 64-entry cache populated with distinct flows and issue SET_HASH_KEY control requests in an unbounded tight loop, retrying the RCU-timing window arbitrarily many times per second with no host-side rate limit.\nPR:L - The attacker needs kernel/root control of a guest domU that has been granted a vif by the host toolstack, i.e. a low, host-conferred privilege relative to the vulnerable dom0 component \u2014 matching this repo's convention for guest-to-host issues such as CVE-2025-22012.\nUI:N - The guest drives the control ring entirely on its own; no dom0 administrator or user action is required at any point in the path.\nS:C - The vulnerable code executes in the dom0/driver-domain kernel while the attacker resides in an untrusted guest, so successful exploitation crosses the Xen VM/host security boundary.\nC:H - Use-after-free traversal reads `link.next` and entry fields out of freed, reclaimable heap memory in the host kernel, which an attacker who reallocates the slab can leverage into disclosure of host kernel data.\nI:H - After following a stale pointer, `list_del_rcu()` writes through attacker-influenceable `prev->next`/`next->prev` and `kfree_rcu()` is invoked on a bogus pointer, yielding a host-kernel write primitive suitable for control-flow hijacking.\nA:H - Dereferencing freed list memory in a dom0 IRQ-thread context with the cache spinlock held causes an oops or panic of the host kernel, taking down every VM on the machine."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/xen-netback/hash.c"], "versions": [{"version": "40d8abdee806d496a60ee607a6d01b1cd7fabaf0", "lessThan": "3c4423b0c4b98213b3438e15061e1d08220e6982", "status": "affected", "versionType": "git"}, {"version": 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"6.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/xen-netback: prevent UAF in xenvif_flush_hash()\n\nDuring the list_for_each_entry_rcu iteration call of xenvif_flush_hash,\nkfree_rcu does not exist inside the rcu read critical section, so if\nkfree_rcu is called when the rcu grace period ends during the iteration,\nUAF occurs when accessing head->next after the entry becomes free.\n\nTherefore, to solve this, you need to change it to list_for_each_entry_safe."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/xen-netback: evitar UAF en xenvif_flush_hash() Durante la llamada de iteraci\u00f3n list_for_each_entry_rcu de xenvif_flush_hash, kfree_rcu no existe dentro de la secci\u00f3n cr\u00edtica de lectura de rcu, por lo que si se llama a kfree_rcu cuando finaliza el per\u00edodo de gracia de rcu durante la iteraci\u00f3n, se produce UAF al acceder a head->next despu\u00e9s de que la entrada se libera. Por lo tanto, para resolver esto, debe cambiarlo a list_for_each_entry_safe."}], "id": "CVE-2024-49936", "lastModified": "2026-08-04T11:20:59.487", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-49936", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:38:23.774447Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:15.413", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/xen-netback: prevent UAF in xenvif_flush_hash()", "id": "2320558", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320558"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/xen-netback: prevent UAF in xenvif_flush_hash()\nDuring the list_for_each_entry_rcu iteration call of xenvif_flush_hash,\nkfree_rcu does not exist inside the rcu read critical section, so if\nkfree_rcu is called when the rcu grace period ends during the iteration,\nUAF occurs when accessing head->next after the entry becomes free.\nTherefore, to solve this, you need to change it to list_for_each_entry_safe."], "name": "CVE-2024-49936", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49936\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49936\nhttps://lore.kernel.org/linux-cve-announce/2024102127-CVE-2024-49936-bf74@gregkh/T"], "threat_severity": "Moderate"}

{}