CVE-2024-27394

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a remote peer has no influence over it, so local syscall access is required.\nAC:L - The attacker controls both sides of the window \u2014 they choose how many keys are queued for `call_rcu` (hundreds per socket, bounded only by optmem_max), can pin CPUs and generate scheduling pressure to force preemption between `call_rcu` and the `key->node.next` dereference, and can retry the entire sequence indefinitely at negligible cost.\nPR:L - `TCP_AO_ADD_KEY` and the `connect()` path carry no capability check whatsoever in `do_tcp_setsockopt()` or `tcp_ao_add_cmd()`, so any unprivileged local user with an ordinary TCP socket can set this up.\nUI:N - The attacker performs every step (socket creation, key insertion, connect) in its own process; no victim action is involved.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Traversal continues through a freed and potentially reclaimed `tcp_ao_key`, letting the attacker steer reads into attacker-groomed memory and, via the resulting unlink/free primitives, leverage the UAF into disclosure of arbitrary kernel memory.\nI:H - `hlist_del_rcu()` on the stale entry gives an attacker-influenced unlink write (`*pprev = next; next->pprev = pprev`), and the subsequent `call_rcu()` on a bogus `rcu_head` yields a deferred arbitrary `kfree()` \u2014 a combination that is exploitable for control-flow hijack and privilege escalation.\nA:H - Even without successful grooming, dereferencing freed/poisoned slab memory and unlinking through a garbage pointer reliably produces a kernel oops or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_ao.c"], "versions": [{"version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "lessThan": "ca4fb6c6764b3f75b4f5aa81db1536291897ff7f", "status": "affected", "versionType": "git"}, {"version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "lessThan": "80e679b352c3ce5158f3f778cfb77eb767e586fb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_ao.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.9", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.8.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f"}, {"url": "https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb"}], "title": "tcp: Fix Use-After-Free in tcp_ao_connect_init", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "affected": [{"vendor": "linux", "product": "linux_kernel", "cpes": ["cpe:2.3:o:linux:linux_kernel:6.7:-:*:*:*:*:*:*"], "defaultStatus": "affected", "versions": [{"version": "6.7", "status": "affected"}]}, {"vendor": "linux", "product": "linux_kernel", "cpes": ["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "versions": [{"version": "7c2ffaf21bd6", "status": "affected", "lessThan": "ca4fb6c6764b", "versionType": "git"}, {"version": "7c2ffaf21bd6", "status": "affected", "lessThan": "80e679b352c3", "versionType": "git"}, {"version": "0", "status": "unaffected", "lessThan": "6.7", "versionType": "git"}, {"version": "6.8.9", "status": "unaffected", "lessThan": "6.9", "versionType": "git"}, {"version": "6.9", "status": "unaffected", "lessThanOrEqual": "*", "versionType": "custom"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-09-04T00:00:00+00:00", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2024-27394"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-10T03:55:12.169Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:34:52.373Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb", "tags": ["x_transferred"]}]}]}}

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a remote peer has no influence over it, so local syscall access is required.\nAC:L - The attacker controls both sides of the window \u2014 they choose how many keys are queued for `call_rcu` (hundreds per socket, bounded only by optmem_max), can pin CPUs and generate scheduling pressure to force preemption between `call_rcu` and the `key->node.next` dereference, and can retry the entire sequence indefinitely at negligible cost.\nPR:L - `TCP_AO_ADD_KEY` and the `connect()` path carry no capability check whatsoever in `do_tcp_setsockopt()` or `tcp_ao_add_cmd()`, so any unprivileged local user with an ordinary TCP socket can set this up.\nUI:N - The attacker performs every step (socket creation, key insertion, connect) in its own process; no victim action is involved.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Traversal continues through a freed and potentially reclaimed `tcp_ao_key`, letting the attacker steer reads into attacker-groomed memory and, via the resulting unlink/free primitives, leverage the UAF into disclosure of arbitrary kernel memory.\nI:H - `hlist_del_rcu()` on the stale entry gives an attacker-influenced unlink write (`*pprev = next; next->pprev = pprev`), and the subsequent `call_rcu()` on a bogus `rcu_head` yields a deferred arbitrary `kfree()` \u2014 a combination that is exploitable for control-flow hijack and privilege escalation.\nA:H - Even without successful grooming, dereferencing freed/poisoned slab memory and unlinking through a garbage pointer reliably produces a kernel oops or panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "lessThan": "ca4fb6c6764b3f75b4f5aa81db1536291897ff7f", "versionType": "git"}, {"status": "affected", "version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "lessThan": "80e679b352c3ce5158f3f778cfb77eb767e586fb", "versionType": "git"}], "programFiles": ["net/ipv4/tcp_ao.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"status": "unaffected", "version": "0", "lessThan": "6.7", "versionType": "semver"}, {"status": "unaffected", "version": "6.8.9", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/tcp_ao.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f"}, {"url": "https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix Use-After-Free in tcp_ao_connect_init\n\nSince call_rcu, which is called in the hlist_for_each_entry_rcu traversal\nof tcp_ao_connect_init, is not part of the RCU read critical section, it\nis possible that the RCU grace period will pass during the traversal and\nthe key will be free.\n\nTo prevent this, it should be changed to hlist_for_each_entry_safe."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.9", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:28.125Z"}}}, "cveMetadata": {"cveId": "CVE-2024-27394", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:29:28.125Z", "dateReserved": "2024-02-25T13:47:42.677Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-09T16:37:11.495Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ao.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ca4fb6c6764b3f75b4f5aa81db1536291897ff7f", "status": "affected", "version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "versionType": "git"}, {"lessThan": "80e679b352c3ce5158f3f778cfb77eb767e586fb", "status": "affected", "version": "7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ao.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"cpes": ["cpe:2.3:o:linux:linux_kernel:6.7:-:*:*:*:*:*:*"], "defaultStatus": "affected", "product": "linux_kernel", "vendor": "linux", "versions": [{"status": "affected", "version": "6.7"}]}, {"cpes": ["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "ca4fb6c6764b", "status": "affected", "version": "7c2ffaf21bd6", "versionType": "git"}, {"lessThan": "80e679b352c3", "status": "affected", "version": "7c2ffaf21bd6", "versionType": "git"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "git"}, {"lessThan": "6.9", "status": "unaffected", "version": "6.8.9", "versionType": "git"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.9", "versionType": "custom"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5F9041E5-8358-4EF7-8F98-B812EDE49612", "versionEndExcluding": "6.8.9", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*", "matchCriteriaId": "22BEDD49-2C6D-402D-9DBF-6646F6ECD10B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*", "matchCriteriaId": "DF73CB2A-DFFD-46FB-9BFE-AA394F27EA37", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*", "matchCriteriaId": "52048DDA-FC5A-4363-95A0-A6357B4D7F8C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*", "matchCriteriaId": "A06B2CCF-3F43-4FA9-8773-C83C3F5764B2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:*", "matchCriteriaId": "F850DCEC-E08B-4317-A33B-D2DCF39F601B", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix Use-After-Free in tcp_ao_connect_init\n\nSince call_rcu, which is called in the hlist_for_each_entry_rcu traversal\nof tcp_ao_connect_init, is not part of the RCU read critical section, it\nis possible that the RCU grace period will pass during the traversal and\nthe key will be free.\n\nTo prevent this, it should be changed to hlist_for_each_entry_safe."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: Fix Use-After-Free en tcp_ao_connect_init Dado que call_rcu, que se llama en el recorrido hlist_for_each_entry_rcu de tcp_ao_connect_init, no forma parte de la secci\u00f3n cr\u00edtica de lectura de RCU, es posible que el El per\u00edodo de gracia de RCU transcurrir\u00e1 durante el recorrido y la clave quedar\u00e1 gratuita. Para evitar esto, se debe cambiar a hlist_for_each_entry_safe."}], "id": "CVE-2024-27394", "lastModified": "2026-08-04T11:17:42.480", "metrics": {"cvssMetricV31": [{"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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.4, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-27394", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-09-04T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2024-05-14T15:12:27.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: tcp: Fix Use-After-Free in tcp_ao_connect_init", "id": "2280442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2280442"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntcp: Fix Use-After-Free in tcp_ao_connect_init\nSince call_rcu, which is called in the hlist_for_each_entry_rcu traversal\nof tcp_ao_connect_init, is not part of the RCU read critical section, it\nis possible that the RCU grace period will pass during the traversal and\nthe key will be free.\nTo prevent this, it should be changed to hlist_for_each_entry_safe.", "A use-after-free (UAF) vulnerability was found in the TCP implementation of the Linux kernel. This issue occurs when memory that has been deallocated is accessed or incorrectly, potentially leading to security risks, such as data corruption or arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-27394", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-27394\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27394\nhttps://lore.kernel.org/linux-cve-announce/2024050836-CVE-2024-27394-4277@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}

{}