{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: sh: aica: reorder cleanup operations to avoid UAF bugs\n\nThe dreamcastcard->timer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard->timer.\n\nWhen the snd_pcm_substream is closing, the aica_channel will be\ndeallocated. But it could still be dereferenced in the worker\nthread. The reason is that del_timer() will return directly\nregardless of whether the timer handler is running or not and\nthe worker could be rescheduled in the timer handler. As a result,\nthe UAF bug will happen. The racy situation is shown below:\n\n      (Thread 1)                 |      (Thread 2)\nsnd_aicapcm_pcm_close()          |\n ...                             |  run_spu_dma() //worker\n                                 |    mod_timer()\n  flush_work()                   |\n  del_timer()                    |  aica_period_elapsed() //timer\n  kfree(dreamcastcard->channel)  |    schedule_work()\n                                 |  run_spu_dma() //worker\n  ...                            |    dreamcastcard->channel-> //USE\n\nIn order to mitigate this bug and other possible corner cases,\ncall mod_timer() conditionally in run_spu_dma(), then implement\nPCM sync_stop op to cancel both the timer and worker. The sync_stop\nop will be called from PCM core appropriately when needed."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "sound/sh/aica.c"
               ],
               "versions": [
                  {
                     "version": "198de43d758c",
                     "lessThan": "eeb2a2ca0b8d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "4206ad65a0ee",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "aa39e6878f61",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "8c9902216816",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "9d66ae0e7bb7",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "61d4787692c1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "e955e8a7f38a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "3c907bf56905",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "198de43d758c",
                     "lessThan": "051e0840ffa8",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "sound/sh/aica.c"
               ],
               "versions": [
                  {
                     "version": "2.6.23",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "2.6.23",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.312",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.274",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.215",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.154",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.84",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.24",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.12",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.3",
                     "lessThanOrEqual": "6.8.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2"
            },
            {
               "url": "https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2"
            },
            {
               "url": "https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845"
            },
            {
               "url": "https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5"
            },
            {
               "url": "https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046"
            },
            {
               "url": "https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901"
            },
            {
               "url": "https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3"
            },
            {
               "url": "https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04"
            },
            {
               "url": "https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457"
            }
         ],
         "title": "ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26654",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}