CVE-2024-26924 (GCVE-0-2024-26924)

Vulnerability from cvelistv5 – Published: 2024-04-24 21:49 – Updated: 2026-08-05 11:28
VLAI
Title
netfilter: nft_set_pipapo: do not free live element
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: do not free live element Pablo reports a crash with large batches of elements with a back-to-back add/remove pattern. Quoting Pablo: add_elem("00000000") timeout 100 ms ... add_elem("0000000X") timeout 100 ms del_elem("0000000X") <---------------- delete one that was just added ... add_elem("00005000") timeout 100 ms 1) nft_pipapo_remove() removes element 0000000X Then, KASAN shows a splat. Looking at the remove function there is a chance that we will drop a rule that maps to a non-deactivated element. Removal happens in two steps, first we do a lookup for key k and return the to-be-removed element and mark it as inactive in the next generation. Then, in a second step, the element gets removed from the set/map. The _remove function does not work correctly if we have more than one element that share the same key. This can happen if we insert an element into a set when the set already holds an element with same key, but the element mapping to the existing key has timed out or is not active in the next generation. In such case its possible that removal will unmap the wrong element. If this happens, we will leak the non-deactivated element, it becomes unreachable. The element that got deactivated (and will be freed later) will remain reachable in the set data structure, this can result in a crash when such an element is retrieved during lookup (stale pointer). Add a check that the fully matching key does in fact map to the element that we have marked as inactive in the deactivation step. If not, we need to continue searching. Add a bug/warn trap at the end of the function as well, the remove function must not ever be called with an invisible/unreachable/non-existent element. v2: avoid uneeded temporary variable (Stefano)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < e3b887a9c11caf8357a821260e095f2a694a34f2 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 41d8fdf3afaff312e17466e4ab732937738d5644 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < ebf7c9746f073035ee26209e38c3a1170f7b349a (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 14b001ba221136c15f894577253e8db535b99487 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc (git)
Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.216 , ≤ 5.10.* (semver)
Unaffected: 5.15.157 , ≤ 5.15.* (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
linux linux_kernel Affected: 5.6
    cpe:2.3:o:linux:linux_kernel:5.6:*:*:*:*:*:*:*
 Create a notification for this product.
linux linux_kernel Affected: 3c4287f62044
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - The vulnerability is reached exclusively through the nfnetlink NFNL_SUBSYS_NFTABLES socket interface, which requires local system access to issue set-element transactions. The subsequent UAF dereference happens on the packet path, but the attacker must first be local to build the poisoned set.\nAC:L - No race or memory-layout luck is needed to create the dangling pointer \u2014 a single deterministic batch (\"add key K with timeout, add K again, delete K\") reliably makes nft_pipapo_remove() unmap the wrong element, and pipapo is unconditionally compiled into nf_tables so no unusual config is required.\nPR:L - nf_tables gates on netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the netns owner\u0027s user namespace, so an unprivileged user obtains it via `unshare -Urn`. The same namespace also lets the attacker send the packets that dereference the freed element, making the whole chain self-contained for an ordinary local user.\nUI:N - The attacker performs every step \u2014 creating the set, driving the add/delete batch, and generating the traffic that hits the stale mapping entry. No victim action is involved.\nS:U - The corruption is confined to the kernel\u0027s own heap and results in standard kernel privilege escalation rather than crossing a hypervisor, IOMMU, or other separate security authority.\nC:H - The freed nft_pipapo_elem stays reachable from the packet lookup path, and nft_lookup_eval() copies nft_set_ext_data() from that freed object into registers, giving an attacker-observable read of reclaimed kernel heap that can be sprayed with sensitive data or kernel pointers.\nI:H - This is a use-after-free on an object whose contents the attacker can control via heap spraying; for verdict maps the freed verdict.chain pointer is followed by nft_do_chain(), and nft_set_elem_update_expr() executes stateful expressions out of the freed memory, yielding write and control-flow-hijack primitives.\nA:H - Even without full exploitation, the dangling f-\u003emt[b].e pointer is dereferenced on every matching packet, producing KASAN splats, oopses, and kernel panics (the reported symptom was a crash)."
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      "id": "CVE-2024-26924",
      "lastModified": "2024-11-21T09:03:23.677",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 3.6}]}",
      "published": "2024-04-25T06:15:57.407",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/14b001ba221136c15f894577253e8db535b99487\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/41d8fdf3afaff312e17466e4ab732937738d5644\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/e3b887a9c11caf8357a821260e095f2a694a34f2\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/ebf7c9746f073035ee26209e38c3a1170f7b349a\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/14b001ba221136c15f894577253e8db535b99487\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/41d8fdf3afaff312e17466e4ab732937738d5644\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/e3b887a9c11caf8357a821260e095f2a694a34f2\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/ebf7c9746f073035ee26209e38c3a1170f7b349a\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis",
      "weaknesses": "[{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-476\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26924\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-25T06:15:57.407\",\"lastModified\":\"2026-08-04T11:17:22.080\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_set_pipapo: do not free live element\\n\\nPablo reports a crash with large batches of elements with a\\nback-to-back add/remove pattern.  Quoting Pablo:\\n\\n  add_elem(\\\"00000000\\\") timeout 100 ms\\n  ...\\n  add_elem(\\\"0000000X\\\") timeout 100 ms\\n  del_elem(\\\"0000000X\\\") \u003c---------------- delete one that was just added\\n  ...\\n  add_elem(\\\"00005000\\\") timeout 100 ms\\n\\n  1) nft_pipapo_remove() removes element 0000000X\\n  Then, KASAN shows a splat.\\n\\nLooking at the remove function there is a chance that we will drop a\\nrule that maps to a non-deactivated element.\\n\\nRemoval happens in two steps, first we do a lookup for key k and return the\\nto-be-removed element and mark it as inactive in the next generation.\\nThen, in a second step, the element gets removed from the set/map.\\n\\nThe _remove function does not work correctly if we have more than one\\nelement that share the same key.\\n\\nThis can happen if we insert an element into a set when the set already\\nholds an element with same key, but the element mapping to the existing\\nkey has timed out or is not active in the next generation.\\n\\nIn such case its possible that removal will unmap the wrong element.\\nIf this happens, we will leak the non-deactivated element, it becomes\\nunreachable.\\n\\nThe element that got deactivated (and will be freed later) will\\nremain reachable in the set data structure, this can result in\\na crash when such an element is retrieved during lookup (stale\\npointer).\\n\\nAdd a check that the fully matching key does in fact map to the element\\nthat we have marked as inactive in the deactivation step.\\nIf not, we need to continue searching.\\n\\nAdd a bug/warn trap at the end of the function as well, the remove\\nfunction must not ever be called with an invisible/unreachable/non-existent\\nelement.\\n\\nv2: avoid uneeded temporary variable (Stefano)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nft_set_pipapo: no liberar elemento activo Pablo informa un bloqueo con grandes lotes de elementos con un patr\u00f3n de agregar/eliminar consecutivos. Citando a Pablo: add_elem(\\\"00000000\\\") timeout 100 ms ... add_elem(\\\"0000000X\\\") timeout 100 ms del_elem(\\\"0000000X\\\") \u0026lt;---------------- elimina uno que se acaba de agregar... add_elem(\\\"00005000\\\") tiempo de espera 100 ms 1) nft_pipapo_remove() elimina el elemento 0000000X Luego, KASAN muestra un s\u00edmbolo. Al observar la funci\u00f3n de eliminaci\u00f3n, existe la posibilidad de que eliminemos una regla que se asigne a un elemento no desactivado. La eliminaci\u00f3n se realiza en dos pasos: primero buscamos la clave k, devolvemos el elemento que se va a eliminar y lo marcamos como inactivo en la pr\u00f3xima generaci\u00f3n. Luego, en un segundo paso, el elemento se elimina del conjunto/mapa. La funci\u00f3n _remove no funciona correctamente si tenemos m\u00e1s de un elemento que comparte la misma clave. Esto puede suceder si insertamos un elemento en un conjunto cuando el conjunto ya contiene un elemento con la misma clave, pero la asignaci\u00f3n del elemento a la clave existente ha expirado o no est\u00e1 activa en la pr\u00f3xima generaci\u00f3n. En tal caso, es posible que la eliminaci\u00f3n desasigne el elemento incorrecto. Si esto sucede, filtraremos el elemento no desactivado, se vuelve inalcanzable. El elemento que se desactiv\u00f3 (y se liberar\u00e1 m\u00e1s adelante) permanecer\u00e1 accesible en la estructura de datos establecida, lo que puede provocar un bloqueo cuando dicho elemento se recupere durante la b\u00fasqueda (puntero obsoleto). Agregue una verificaci\u00f3n de que la clave que coincide completamente de hecho se asigna al elemento que hemos marcado como inactivo en el paso de desactivaci\u00f3n. Si no, debemos seguir buscando. Agregue tambi\u00e9n una trampa de error/advertencia al final de la funci\u00f3n; la funci\u00f3n de eliminaci\u00f3n nunca debe llamarse con un elemento invisible/inalcanzable/inexistente. v2: evitar variables temporales innecesarias (Stefano)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nft_set_pipapo.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"e3b887a9c11caf8357a821260e095f2a694a34f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"41d8fdf3afaff312e17466e4ab732937738d5644\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"ebf7c9746f073035ee26209e38c3a1170f7b349a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"14b001ba221136c15f894577253e8db535b99487\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4287f62044a90e73a561aa05fc46e62da173da\",\"lessThan\":\"3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nft_set_pipapo.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.216\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.157\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.88\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.29\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8.8\",\"lessThanOrEqual\":\"6.8.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"affectedData\":[{\"vendor\":\"linux\",\"product\":\"linux_kernel\",\"defaultStatus\":\"unknown\",\"cpes\":[\"cpe:2.3:o:linux:linux_kernel:5.6:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"}]},{\"vendor\":\"linux\",\"product\":\"linux_kernel\",\"defaultStatus\":\"unknown\",\"cpes\":[\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"3c4287f62044\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-04-29T16:46:54.309255Z\",\"id\":\"CVE-2024-26924\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T10:56:44+00:00",
      "cve": "CVE-2024-26924",
      "id": "CVE-2024-26924",
      "initial_release_date": "2024-04-24T00:00:00+00:00",
      "product_status:fixed": "709",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "50",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_set_pipapo: do not free live element",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26924.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T01:54:45Z",
      "cve": "CVE-2024-26924",
      "id": "CVE-2024-26924",
      "initial_release_date": "2024-04-25T23:11:54Z",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "179",
      "product_status:recommended": "707",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26924",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26924.json",
      "version": "148"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e3b887a9c11caf8357a821260e095f2a694a34f2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/41d8fdf3afaff312e17466e4ab732937738d5644\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ebf7c9746f073035ee26209e38c3a1170f7b349a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/14b001ba221136c15f894577253e8db535b99487\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-04T17:14:47.716Z\"}}, {\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26924\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-04-29T16:46:54.309255Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.6:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"3c4287f62044\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-04-29T16:46:24.026Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"netfilter: nft_set_pipapo: do not free live element\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerability is reached exclusively through the nfnetlink NFNL_SUBSYS_NFTABLES socket interface, which requires local system access to issue set-element transactions. The subsequent UAF dereference happens on the packet path, but the attacker must first be local to build the poisoned set.\\nAC:L - No race or memory-layout luck is needed to create the dangling pointer \\u2014 a single deterministic batch (\\\"add key K with timeout, add K again, delete K\\\") reliably makes nft_pipapo_remove() unmap the wrong element, and pipapo is unconditionally compiled into nf_tables so no unusual config is required.\\nPR:L - nf_tables gates on netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the netns owner\u0027s user namespace, so an unprivileged user obtains it via `unshare -Urn`. The same namespace also lets the attacker send the packets that dereference the freed element, making the whole chain self-contained for an ordinary local user.\\nUI:N - The attacker performs every step \\u2014 creating the set, driving the add/delete batch, and generating the traffic that hits the stale mapping entry. No victim action is involved.\\nS:U - The corruption is confined to the kernel\u0027s own heap and results in standard kernel privilege escalation rather than crossing a hypervisor, IOMMU, or other separate security authority.\\nC:H - The freed nft_pipapo_elem stays reachable from the packet lookup path, and nft_lookup_eval() copies nft_set_ext_data() from that freed object into registers, giving an attacker-observable read of reclaimed kernel heap that can be sprayed with sensitive data or kernel pointers.\\nI:H - This is a use-after-free on an object whose contents the attacker can control via heap spraying; for verdict maps the freed verdict.chain pointer is followed by nft_do_chain(), and nft_set_elem_update_expr() executes stateful expressions out of the freed memory, yielding write and control-flow-hijack primitives.\\nA:H - Even without full exploitation, the dangling f-\u003emt[b].e pointer is dereferenced on every matching packet, producing KASAN splats, oopses, and kernel panics (the reported symptom was a crash).\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"e3b887a9c11caf8357a821260e095f2a694a34f2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"41d8fdf3afaff312e17466e4ab732937738d5644\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"ebf7c9746f073035ee26209e38c3a1170f7b349a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"14b001ba221136c15f894577253e8db535b99487\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3c4287f62044a90e73a561aa05fc46e62da173da\", \"lessThan\": \"3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nft_set_pipapo.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.29\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nft_set_pipapo.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e3b887a9c11caf8357a821260e095f2a694a34f2\"}, {\"url\": \"https://git.kernel.org/stable/c/7a1679e2d9bfa3b5f8755c2c7113e54b7d42bd46\"}, {\"url\": \"https://git.kernel.org/stable/c/41d8fdf3afaff312e17466e4ab732937738d5644\"}, {\"url\": \"https://git.kernel.org/stable/c/ebf7c9746f073035ee26209e38c3a1170f7b349a\"}, {\"url\": \"https://git.kernel.org/stable/c/14b001ba221136c15f894577253e8db535b99487\"}, {\"url\": \"https://git.kernel.org/stable/c/3cfc9ec039af60dbd8965ae085b2c2ccdcfbe1cc\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_set_pipapo: do not free live element\\n\\nPablo reports a crash with large batches of elements with a\\nback-to-back add/remove pattern.  Quoting Pablo:\\n\\n  add_elem(\\\"00000000\\\") timeout 100 ms\\n  ...\\n  add_elem(\\\"0000000X\\\") timeout 100 ms\\n  del_elem(\\\"0000000X\\\") \u003c---------------- delete one that was just added\\n  ...\\n  add_elem(\\\"00005000\\\") timeout 100 ms\\n\\n  1) nft_pipapo_remove() removes element 0000000X\\n  Then, KASAN shows a splat.\\n\\nLooking at the remove function there is a chance that we will drop a\\nrule that maps to a non-deactivated element.\\n\\nRemoval happens in two steps, first we do a lookup for key k and return the\\nto-be-removed element and mark it as inactive in the next generation.\\nThen, in a second step, the element gets removed from the set/map.\\n\\nThe _remove function does not work correctly if we have more than one\\nelement that share the same key.\\n\\nThis can happen if we insert an element into a set when the set already\\nholds an element with same key, but the element mapping to the existing\\nkey has timed out or is not active in the next generation.\\n\\nIn such case its possible that removal will unmap the wrong element.\\nIf this happens, we will leak the non-deactivated element, it becomes\\nunreachable.\\n\\nThe element that got deactivated (and will be freed later) will\\nremain reachable in the set data structure, this can result in\\na crash when such an element is retrieved during lookup (stale\\npointer).\\n\\nAdd a check that the fully matching key does in fact map to the element\\nthat we have marked as inactive in the deactivation step.\\nIf not, we need to continue searching.\\n\\nAdd a bug/warn trap at the end of the function as well, the remove\\nfunction must not ever be called with an invisible/unreachable/non-existent\\nelement.\\n\\nv2: avoid uneeded temporary variable (Stefano)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.157\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.88\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.29\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:22.379Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26924\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:22.379Z\", \"dateReserved\": \"2024-02-19T14:20:24.194Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-24T21:49:22.631Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.