cve-2024-35846
Vulnerability from cvelistv5
Published
2024-05-17 14:47
Modified
2024-11-05 09:23
Severity ?
Summary
mm: zswap: fix shrinker NULL crash with cgroup_disable=memory
Impacted products
Vendor Product Version
Linux Linux Version: 6.8
Show details on NVD website


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                        id: "CVE-2024-35846",
                        options: [
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                              Exploitation: "none",
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                              Automatable: "no",
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                        role: "CISA Coordinator",
                        timestamp: "2024-05-17T17:15:58.051096Z",
                        version: "2.0.3",
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      cna: {
         affected: [
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               product: "Linux",
               programFiles: [
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         descriptions: [
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               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: zswap: fix shrinker NULL crash with cgroup_disable=memory\n\nChristian reports a NULL deref in zswap that he bisected down to the zswap\nshrinker.  The issue also cropped up in the bug trackers of libguestfs [1]\nand the Red Hat bugzilla [2].\n\nThe problem is that when memcg is disabled with the boot time flag, the\nzswap shrinker might get called with sc->memcg == NULL.  This is okay in\nmany places, like the lruvec operations.  But it crashes in\nmemcg_page_state() - which is only used due to the non-node accounting of\ncgroup's the zswap memory to begin with.\n\nNhat spotted that the memcg can be NULL in the memcg-disabled case, and I\nwas then able to reproduce the crash locally as well.\n\n[1] https://github.com/libguestfs/libguestfs/issues/139\n[2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252",
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         title: "mm: zswap: fix shrinker NULL crash with cgroup_disable=memory",
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      cveId: "CVE-2024-35846",
      datePublished: "2024-05-17T14:47:25.503Z",
      dateReserved: "2024-05-17T13:50:33.105Z",
      dateUpdated: "2024-11-05T09:23:37.497Z",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-35846\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-17T15:15:21.547\",\"lastModified\":\"2024-11-21T09:21:02.143\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm: zswap: fix shrinker NULL crash with cgroup_disable=memory\\n\\nChristian reports a NULL deref in zswap that he bisected down to the zswap\\nshrinker.  The issue also cropped up in the bug trackers of libguestfs [1]\\nand the Red Hat bugzilla [2].\\n\\nThe problem is that when memcg is disabled with the boot time flag, the\\nzswap shrinker might get called with sc->memcg == NULL.  This is okay in\\nmany places, like the lruvec operations.  But it crashes in\\nmemcg_page_state() - which is only used due to the non-node accounting of\\ncgroup's the zswap memory to begin with.\\n\\nNhat spotted that the memcg can be NULL in the memcg-disabled case, and I\\nwas then able to reproduce the crash locally as well.\\n\\n[1] https://github.com/libguestfs/libguestfs/issues/139\\n[2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mm: zswap: corrige el bloqueo NULL del reductor con cgroup_disable=memory. Christian informa una deref NULL en zswap que dividió en dos hasta el reductor zswap. El problema también surgió en los rastreadores de errores de libguestfs [1] y Red Hat bugzilla [2]. El problema es que cuando memcg está deshabilitado con el indicador de tiempo de arranque, es posible que se llame al reductor zswap con sc->memcg == NULL. Esto está bien en muchos lugares, como en las operaciones de lruvec. Pero fallo en memcg_page_state(), que para empezar solo se usa debido a la contabilidad sin nodos de la memoria zswap de cgroup. Nhat detectó que memcg puede ser NULL en el caso de que memcg esté deshabilitado y luego también pude reproducir el fallo localmente. [1] https://github.com/libguestfs/libguestfs/issues/139 [2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
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