fkie_cve-2024-42109
Vulnerability from fkie_nvd
Published
2024-07-30 08:15
Modified
2024-11-21 09:33
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally flush pending work before notifier syzbot reports: KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831 KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530 KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45 [..] Workqueue: events nf_tables_trans_destroy_work Call Trace: nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline] nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline] nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Problem is that the notifier does a conditional flush, but its possible that the table-to-be-removed is still referenced by transactions being processed by the worker, so we need to flush unconditionally. We could make the flush_work depend on whether we found a table to delete in nf-next to avoid the flush for most cases. AFAICS this problem is only exposed in nf-next, with commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"), with this commit applied there is an unconditional fetch of table->family which is whats triggering the above splat.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "5FD25434-47C3-45B8-B46A-6352379CD2F9",
                     versionEndExcluding: "5.15.163",
                     versionStartIncluding: "5.15.129",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "24E84470-CB41-4B10-ACC2-6579459F3A48",
                     versionEndExcluding: "6.1.98",
                     versionStartIncluding: "6.1.50",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "E079242F-1B25-40DA-BCE2-2A7965C9168E",
                     versionEndExcluding: "6.6.39",
                     versionStartIncluding: "6.5",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "ADCC1407-0CB3-4C8F-B4C5-07F682CD7085",
                     versionEndExcluding: "6.9.9",
                     versionStartIncluding: "6.7",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unconditionally flush pending work before notifier\n\nsyzbot reports:\n\nKASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831\nKASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530\nKASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\nRead of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45\n[..]\nWorkqueue: events nf_tables_trans_destroy_work\nCall Trace:\n nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]\n nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]\n nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\n\nProblem is that the notifier does a conditional flush, but its possible\nthat the table-to-be-removed is still referenced by transactions being\nprocessed by the worker, so we need to flush unconditionally.\n\nWe could make the flush_work depend on whether we found a table to delete\nin nf-next to avoid the flush for most cases.\n\nAFAICS this problem is only exposed in nf-next, with\ncommit e169285f8c56 (\"netfilter: nf_tables: do not store nft_ctx in transaction objects\"),\nwith this commit applied there is an unconditional fetch of\ntable->family which is whats triggering the above splat.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: vaciar incondicionalmente el trabajo pendiente antes de que el notificador syzbot informe: KASAN: slab-uaf en nft_ctx_update include/net/netfilter/nf_tables.h:1831 KASAN: slab-uaf en nft_commit_release net/netfilter/nf_tables_api.c:9530 KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Lectura de tamaño 2 en la dirección ffff88802b0051c4 por tarea kworker/1:1/45 [..] ue : eventos nf_tables_trans_destroy_work Seguimiento de llamadas: nft_ctx_update include/net/netfilter/nf_tables.h:1831 [en línea] nft_commit_release net/netfilter/nf_tables_api.c:9530 [en línea] nf_tables_trans_destroy_work+0x152b/0x1750 s_api.c:9597 El problema es que el notificador realiza un vaciado condicional, pero es posible que las transacciones que procesa el trabajador aún hagan referencia a la tabla que se va a eliminar, por lo que debemos realizar un vaciado incondicional. Podríamos hacer que flux_work dependa de si encontramos una tabla para eliminar en nf-next para evitar el vaciado en la mayoría de los casos. AFAICS, este problema solo se expone en nf-next, con la confirmación e169285f8c56 (\"netfilter: nf_tables: no almacenar nft_ctx en objetos de transacción\"), con esta confirmación aplicada hay una búsqueda incondicional de tabla->familia que es lo que desencadena lo anterior salpicar.",
      },
   ],
   id: "CVE-2024-42109",
   lastModified: "2024-11-21T09:33:37.223",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-07-30T08:15:03.407",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "NVD-CWE-noinfo",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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