{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-27397", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:47:42.677Z", "datePublished": "2024-05-09T16:37:22.463Z", "dateUpdated": "2026-08-05T11:29:31.362Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:31.362Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: use timestamp to check for set element timeout\n\nAdd a timestamp field at the beginning of the transaction, store it\nin the nftables per-netns area.\n\nUpdate set backend .insert, .deactivate and sync gc path to use the\ntimestamp, this avoids that an element expires while control plane\ntransaction is still unfinished.\n\n.lookup and .update, which are used from packet path, still use the\ncurrent time to check if the element has expired. And .get path and dump\nalso since this runs lockless under rcu read size lock. Then, there is\nasync gc which also needs to check the current time since it runs\nasynchronously from a workqueue."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached only through the NETLINK_NETFILTER socket (`nfnetlink_rcv_batch` \u2192 `nf_tables_newsetelem`/`delsetelem` \u2192 set backend `.insert`/`.deactivate`/sync GC), which requires a local process on the system. Per kernel scoring guidance, netfilter/nftables netlink control-plane bugs are Local.\nAC:L - The attacker controls both sides of the timing window: `NFTA_SET_ELEM_TIMEOUT`/`NFTA_SET_ELEM_EXPIRATION` set the expiry instant at millisecond granularity, and the length of the netlink batch determines how long the transaction runs under `commit_mutex`, so the element can be made to flip to expired at a chosen point mid-transaction with no reliance on uncontrolled conditions.\nPR:L - `nfnetlink` only requires `netlink_net_capable(skb, CAP_NET_ADMIN)`, which is `ns_capable` against the user namespace owning the netns, so an unprivileged user obtains it with `unshare -Urn`. No real root in the init namespace is needed.\nUI:N - The attacker performs every step from their own process \u2014 create the set, add the timed element, submit the batch \u2014 with no victim action of any kind.\nS:U - The corruption is of kernel heap objects and results in privilege escalation within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The double-free/use-after-free on `nft_rhash_elem`/`nft_rbtree_elem`/`nft_pipapo_elem` lets the attacker reclaim the freed slab chunk with a chosen object and read it back via `NFT_MSG_GETSETELEM` dumps and element counter/quota expressions, yielding an arbitrary kernel-memory read primitive; the `use`-counter underflow additionally exposes freed `nft_chain`/`nft_object` contents.\nI:H - The abort path writes into the freed element (`nft_setelem_data_activate()` + `ops->activate()` incrementing refcounts through a dangling pointer) and the duplicate-key/double-free conditions give a controllable heap write primitive suitable for control-flow hijacking and root privilege escalation; the dangling-interval side effect also silently alters firewall verdicts.\nA:H - Even without successful exploitation, the double free and the `nft_use_dec` refcount underflow reliably trigger kernel oops/panic (slab corruption, `refcount_t` warnings, freeing a chain still referenced by the packet path), crashing the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_tables.h", "net/netfilter/nf_tables_api.c", "net/netfilter/nft_set_hash.c", "net/netfilter/nft_set_pipapo.c", "net/netfilter/nft_set_rbtree.c"], "versions": [{"version": "c3e1b005ed1cc068fc9d454a6e745830d55d251d", "lessThan": "f8dfda798650241c1692058713ca4fef8e429061", "status": "affected", "versionType": "git"}, {"version": "c3e1b005ed1cc068fc9d454a6e745830d55d251d", 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And .get path and dump\nalso since this runs lockless under rcu read size lock. Then, there is\nasync gc which also needs to check the current time since it runs\nasynchronously from a workqueue."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: netfilter: nf_tables: use la marca de tiempo para verificar el tiempo de espera del elemento establecido. Agregue un campo de marca de tiempo al comienzo de la transacci\u00f3n y gu\u00e1rdelo en el \u00e1rea nftables per-netns. Actualice el conjunto de backend .insert, .deactivate y sincronice la ruta gc para usar la marca de tiempo, esto evita que un elemento caduque mientras la transacci\u00f3n del plano de control a\u00fan no ha finalizado. .lookup y .update, que se usan desde la ruta del paquete, a\u00fan usan la hora actual para verificar si el elemento ha caducado. Y obtener ruta y volcar tambi\u00e9n, ya que se ejecuta sin bloqueo bajo el bloqueo de tama\u00f1o de lectura de rcu. Luego, est\u00e1 el gc async que tambi\u00e9n necesita verificar la hora actual, ya que se ejecuta de forma asincr\u00f3nica desde una cola de trabajo."}], "id": "CVE-2024-27397", "lastModified": "2026-06-17T07:19:49.050", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-27397", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-17T17:39:42.529200Z", "version": "2.0.3"}}]}, "published": "2024-05-14T15:12:28.240", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d40e8cb1d1f56a994cdd2e015af622fdca9ed4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/383182db8d58c4237772ba0764cded4938a235c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7395dfacfff65e9938ac0889dafa1ab01e987d15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b17de2a71e56c10335b565cc7ad238e6d984379"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7fa2e2960fff8322ce2ded57b5f8e9cbc450b967"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b45176b869673417ace338b87cf9cdb66e2eeb01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eaf1a29ea5d7dba8e84e9e9f3b3f47d0cd540bfe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8dfda798650241c1692058713ca4fef8e429061"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/383182db8d58c4237772ba0764cded4938a235c3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7395dfacfff65e9938ac0889dafa1ab01e987d15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b45176b869673417ace338b87cf9cdb66e2eeb01"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:4352", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.8.1.rt7.349.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-07-08T00:00:00Z"}, {"advisory": "RHSA-2024:4211", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.8.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-07-02T00:00:00Z"}, {"advisory": "RHSA-2024:4447", "cpe": "cpe:/o:redhat:rhel_aus:8.6", "package": "kernel-0:4.18.0-372.111.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2024-07-10T00:00:00Z"}, {"advisory": "RHSA-2024:4447", "cpe": "cpe:/o:redhat:rhel_tus:8.6", "package": "kernel-0:4.18.0-372.111.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2024-07-10T00:00:00Z"}, {"advisory": "RHSA-2024:4447", "cpe": "cpe:/o:redhat:rhel_e4s:8.6", "package": "kernel-0:4.18.0-372.111.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2024-07-10T00:00:00Z"}, {"advisory": "RHSA-2024:4740", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.64.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-07-23T00:00:00Z"}, {"advisory": "RHSA-2024:4583", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.26.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-07-17T00:00:00Z"}, {"advisory": "RHSA-2024:4583", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.26.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-07-17T00:00:00Z"}, {"advisory": "RHSA-2024:5257", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "kernel-0:5.14.0-70.112.1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5256", "cpe": "cpe:/a:redhat:rhel_e4s:9.0::nfv", "package": "kernel-rt-0:5.14.0-70.112.1.rt21.184.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:4108", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.71.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-06-26T00:00:00Z"}, {"advisory": "RHSA-2024:4106", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.71.1.rt14.356.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-06-26T00:00:00Z"}], "bugzilla": {"description": "kernel: netfilter: nf_tables: use timestamp to check for set element timeout", "id": "2280434", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2280434"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_tables: use timestamp to check for set element timeout\nAdd a timestamp field at the beginning of the transaction, store it\nin the nftables per-netns area.\nUpdate set backend .insert, .deactivate and sync gc path to use the\ntimestamp, this avoids that an element expires while control plane\ntransaction is still unfinished.\n.lookup and .update, which are used from packet path, still use the\ncurrent time to check if the element has expired. And .get path and dump\nalso since this runs lockless under rcu read size lock. Then, there is\nasync gc which also needs to check the current time since it runs\nasynchronously from a workqueue.", "A use-after-free flaw was found in the Linux kernel\u2019s netfilter subsystem in how a user triggers the element timeout. This flaw allows a local user to crash or potentially escalate their privileges on the system."], "mitigation": {"lang": "en:us", "value": "In order to trigger the issue, it requires the ability to create user/net namespaces.\nOn non-containerized deployments of Red Hat Enterprise Linux 8, you can disable user namespaces by setting user.max_user_namespaces to 0:\n# echo \"user.max_user_namespaces=0\" > /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf\nOn containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled."}, "name": "CVE-2024-27397", "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:9", "fix_state": "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-2024-27397\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27397\nhttps://lore.kernel.org/linux-cve-announce/2024050837-CVE-2024-27397-fd1e@gregkh/T"], "statement": "This vulnerability impact level between Moderate and High, and chosen Moderate.", "threat_severity": "Moderate"}

{}