nvd-json-data-feeds/CVE-2024/CVE-2024-266xx/CVE-2024-26688.json

{
  "id": "CVE-2024-26688",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-04-03T15:15:52.370",
  "lastModified": "2024-06-25T22:15:20.987",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_super\n\nWhen configuring a hugetlb filesystem via the fsconfig() syscall, there is\na possible NULL dereference in hugetlbfs_fill_super() caused by assigning\nNULL to ctx->hstate in hugetlbfs_parse_param() when the requested pagesize\nis non valid.\n\nE.g: Taking the following steps:\n\n     fd = fsopen(\"hugetlbfs\", FSOPEN_CLOEXEC);\n     fsconfig(fd, FSCONFIG_SET_STRING, \"pagesize\", \"1024\", 0);\n     fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);\n\nGiven that the requested \"pagesize\" is invalid, ctxt->hstate will be replaced\nwith NULL, losing its previous value, and we will print an error:\n\n ...\n ...\n case Opt_pagesize:\n ps = memparse(param->string, &rest);\n ctx->hstate = h;\n if (!ctx->hstate) {\n         pr_err(\"Unsupported page size %lu MB\\n\", ps / SZ_1M);\n         return -EINVAL;\n }\n return 0;\n ...\n ...\n\nThis is a problem because later on, we will dereference ctxt->hstate in\nhugetlbfs_fill_super()\n\n ...\n ...\n sb->s_blocksize = huge_page_size(ctx->hstate);\n ...\n ...\n\nCausing below Oops.\n\nFix this by replacing cxt->hstate value only when then pagesize is known\nto be valid.\n\n kernel: hugetlbfs: Unsupported page size 0 MB\n kernel: BUG: kernel NULL pointer dereference, address: 0000000000000028\n kernel: #PF: supervisor read access in kernel mode\n kernel: #PF: error_code(0x0000) - not-present page\n kernel: PGD 800000010f66c067 P4D 800000010f66c067 PUD 1b22f8067 PMD 0\n kernel: Oops: 0000 [#1] PREEMPT SMP PTI\n kernel: CPU: 4 PID: 5659 Comm: syscall Tainted: G            E      6.8.0-rc2-default+ #22 5a47c3fef76212addcc6eb71344aabc35190ae8f\n kernel: Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0016.D04.1705030402 05/03/2017\n kernel: RIP: 0010:hugetlbfs_fill_super+0xb4/0x1a0\n kernel: Code: 48 8b 3b e8 3e c6 ed ff 48 85 c0 48 89 45 20 0f 84 d6 00 00 00 48 b8 ff ff ff ff ff ff ff 7f 4c 89 e7 49 89 44 24 20 48 8b 03 <8b> 48 28 b8 00 10 00 00 48 d3 e0 49 89 44 24 18 48 8b 03 8b 40 28\n kernel: RSP: 0018:ffffbe9960fcbd48 EFLAGS: 00010246\n kernel: RAX: 0000000000000000 RBX: ffff9af5272ae780 RCX: 0000000000372004\n kernel: RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: ffff9af555e9b000\n kernel: RBP: ffff9af52ee66b00 R08: 0000000000000040 R09: 0000000000370004\n kernel: R10: ffffbe9960fcbd48 R11: 0000000000000040 R12: ffff9af555e9b000\n kernel: R13: ffffffffa66b86c0 R14: ffff9af507d2f400 R15: ffff9af507d2f400\n kernel: FS:  00007ffbc0ba4740(0000) GS:ffff9b0bd7000000(0000) knlGS:0000000000000000\n kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n kernel: CR2: 0000000000000028 CR3: 00000001b1ee0000 CR4: 00000000001506f0\n kernel: Call Trace:\n kernel:  <TASK>\n kernel:  ? __die_body+0x1a/0x60\n kernel:  ? page_fault_oops+0x16f/0x4a0\n kernel:  ? search_bpf_extables+0x65/0x70\n kernel:  ? fixup_exception+0x22/0x310\n kernel:  ? exc_page_fault+0x69/0x150\n kernel:  ? asm_exc_page_fault+0x22/0x30\n kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10\n kernel:  ? hugetlbfs_fill_super+0xb4/0x1a0\n kernel:  ? hugetlbfs_fill_super+0x28/0x1a0\n kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10\n kernel:  vfs_get_super+0x40/0xa0\n kernel:  ? __pfx_bpf_lsm_capable+0x10/0x10\n kernel:  vfs_get_tree+0x25/0xd0\n kernel:  vfs_cmd_create+0x64/0xe0\n kernel:  __x64_sys_fsconfig+0x395/0x410\n kernel:  do_syscall_64+0x80/0x160\n kernel:  ? syscall_exit_to_user_mode+0x82/0x240\n kernel:  ? do_syscall_64+0x8d/0x160\n kernel:  ? syscall_exit_to_user_mode+0x82/0x240\n kernel:  ? do_syscall_64+0x8d/0x160\n kernel:  ? exc_page_fault+0x69/0x150\n kernel:  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n kernel: RIP: 0033:0x7ffbc0cb87c9\n kernel: Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 97 96 0d 00 f7 d8 64 89 01 48\n kernel: RSP: 002b:00007ffc29d2f388 EFLAGS: 00000206 ORIG_RAX: 00000000000001af\n kernel: RAX: ffffff
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs,hugetlb: corrige la desreferencia del puntero NULL en hugetlbs_fill_super Al configurar un SYSTEM de archivos de Hugetlb a trav\u00e9s de la llamada al SYSTEM fsconfig(), existe una posible desreferencia de NULL en hugetlbfs_fill_super() causada por la asignaci\u00f3n de NULL a ctx. -&gt;hstate en hugetlbfs_parse_param() cuando el tama\u00f1o de p\u00e1gina solicitado no es v\u00e1lido. Por ejemplo: siguiendo los siguientes pasos: fd = fsopen(\"hugetlbfs\", FSOPEN_CLOEXEC); fsconfig(fd, FSCONFIG_SET_STRING, \"tama\u00f1o de p\u00e1gina\", \"1024\", 0); fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0); Dado que el \"tama\u00f1o de p\u00e1gina\" solicitado no es v\u00e1lido, ctxt-&gt;hstate ser\u00e1 reemplazado por NULL, perdiendo su valor anterior, e imprimiremos un error: ... ... case Opt_pagesize: ps = memparse(param-&gt;string, &amp;descansar); ctx-&gt;hestado = h; if (!ctx-&gt;hstate) { pr_err(\"Tama\u00f1o de p\u00e1gina no admitido %lu MB\\n\", ps / SZ_1M); devolver -EINVAL; } devolver 0; ... ... Esto es un problema porque m\u00e1s adelante eliminaremos la referencia a ctxt-&gt;hstate en hugetlbfs_fill_super() ... ... sb-&gt;s_blocksize = huge_page_size(ctx-&gt;hstate); ... ... Causando debajo Ups. Solucione este problema reemplazando el valor cxt-&gt;hstate solo cuando se sepa que el tama\u00f1o de p\u00e1gina es v\u00e1lido. kernel: hugetlbfs: Tama\u00f1o de p\u00e1gina no admitido 0 MB kernel: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000028 kernel: #PF: acceso de lectura del supervisor en modo kernel kernel: #PF: c\u00f3digo_error(0x0000) - p\u00e1gina no presente kernel: PGD 800000010f66c067 P4D 800000010f66c067 PUD 1b22f8067 PMD 0 kernel: Ups: 0000 [#1] PREEMPT SMP PTI kernel: CPU: 4 PID: 5659 Comm: syscall Contaminado: GE 6.8.0-rc2-default+ #22 5a47c3fef76212addcc6eb71344 Kernel aabc35190ae8f: Nombre del hardware: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0016.D04.1705030402 03/05/2017 kernel: RIP: 0010:hugetlbfs_fill_super+0xb4/0x1a0 kernel: C\u00f3digo: 48 8b 3b e8 3e c6 ed ff 48 85 c0 48 89 45 20 0f 84 d6 00 00 00 48 b8 ff ff ff ff ff ff ff 7f 4c 89 e7 49 89 44 24 20 48 8b 03 &lt;8b&gt; 48 28 b8 00 10 00 00 48 d3 e0 49 89 44 24 18 48 8b 03 8b 40 28 kernel: RSP: 0018:ffffbe9960fcbd48 EFLAGS: 00010246 kernel: RAX: 0000000000000000 RBX: ffff9af5272ae780 RCX: 0000000000372004 kernel: RDX: ffffffffffffffff RSI: ffffffffffffffff R DI: ffff9af555e9b000 kernel: RBP: ffff9af52ee66b00 R08: 0000000000000040 R09: 0000000000370004 kernel: R10: ffffbe9960fcbd48 R11: 0000000000000040 R12: ffff9af555e9b000 kernel: R13: fffffffa66b86c0 R14: ffff9af507d2f400 R15: ffff9af507d2f400 kernel: FS: 00007ffbc0ba4740(0000) GS:ffff9b0bd7 000000(0000) knlGS:0000000000000000 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000000000000028 CR3: 00000001b1ee0000 CR4: 00000000001506f0 kernel: Seguimiento de llamadas: kernel:  kernel: ? __die_body+0x1a/0x60 n\u00facleo: ? page_fault_oops+0x16f/0x4a0 n\u00facleo:? search_bpf_extables+0x65/0x70 n\u00facleo:? fixup_exception+0x22/0x310 kernel:? exc_page_fault+0x69/0x150 n\u00facleo:? asm_exc_page_fault+0x22/0x30 n\u00facleo:? __pfx_hugetlbfs_fill_super+0x10/0x10 n\u00facleo:? n\u00facleo enormetlbfs_fill_super+0xb4/0x1a0:? enormetlbfs_fill_super+0x28/0x1a0 kernel:? __pfx_hugetlbfs_fill_super+0x10/0x10 kernel: vfs_get_super+0x40/0xa0 kernel:? __pfx_bpf_lsm_capable+0x10/0x10 kernel: vfs_get_tree+0x25/0xd0 kernel: vfs_cmd_create+0x64/0xe0 kernel: __x64_sys_fsconfig+0x395/0x410 kernel: do_syscall_64+0x80/0x160 kernel: ? syscall_exit_to_user_mode+0x82/0x240 kernel:? do_syscall_64+0x8d/0x160 n\u00facleo:? syscall_exit_to_user_mode+0x82/0x240 kernel:? do_syscall_64+0x8d/0x160 n\u00facleo:? exc_page_fault+0x69/0x150 kernel: Entry_SYSCALL_64_after_hwframe+0x6e/0x76 kernel: RIP: 0033:0x7ffbc0cb87c9 kernel: C\u00f3digo: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 &lt;48&gt
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/13c5a9fb07105557a1fa9efdb4f23d7ef30b7274",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1dde8ef4b7a749ae1bc73617c91775631d167557",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/22850c9950a4e43a67299755d11498f3292d02ff",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2e2c07104b4904aed1389a59b25799b95a85b5b9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/79d72c68c58784a3e1cd2378669d51bfd0cb7498",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/80d852299987a8037be145a94f41874228f1a773",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec78418801ef7b0c22cd6a30145ec480dd48db39",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}