{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Fix double free in SMC transport cleanup path\n\nWhen the generic SCMI code tears down a channel, it calls the chan_free\ncallback function, defined by each transport. Since multiple protocols\nmight share the same transport_info member, chan_free() might want to\nclean up the same member multiple times within the given SCMI transport\nimplementation. In this case, it is SMC transport. This will lead to a NULL\npointer dereference at the second time:\n\n    | scmi_protocol scmi_dev.1: Enabled polling mode TX channel - prot_id:16\n    | arm-scmi firmware:scmi: SCMI Notifications - Core Enabled.\n    | arm-scmi firmware:scmi: unable to communicate with SCMI\n    | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n    | Mem abort info:\n    |   ESR = 0x0000000096000004\n    |   EC = 0x25: DABT (current EL), IL = 32 bits\n    |   SET = 0, FnV = 0\n    |   EA = 0, S1PTW = 0\n    |   FSC = 0x04: level 0 translation fault\n    | Data abort info:\n    |   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n    |   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n    |   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n    | user pgtable: 4k pages, 48-bit VAs, pgdp=0000000881ef8000\n    | [0000000000000000] pgd=0000000000000000, p4d=0000000000000000\n    | Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP\n    | Modules linked in:\n    | CPU: 4 PID: 1 Comm: swapper/0 Not tainted 6.7.0-rc2-00124-g455ef3d016c9-dirty #793\n    | Hardware name: FVP Base RevC (DT)\n    | pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n    | pc : smc_chan_free+0x3c/0x6c\n    | lr : smc_chan_free+0x3c/0x6c\n    | Call trace:\n    |  smc_chan_free+0x3c/0x6c\n    |  idr_for_each+0x68/0xf8\n    |  scmi_cleanup_channels.isra.0+0x2c/0x58\n    |  scmi_probe+0x434/0x734\n    |  platform_probe+0x68/0xd8\n    |  really_probe+0x110/0x27c\n    |  __driver_probe_device+0x78/0x12c\n    |  driver_probe_device+0x3c/0x118\n    |  __driver_attach+0x74/0x128\n    |  bus_for_each_dev+0x78/0xe0\n    |  driver_attach+0x24/0x30\n    |  bus_add_driver+0xe4/0x1e8\n    |  driver_register+0x60/0x128\n    |  __platform_driver_register+0x28/0x34\n    |  scmi_driver_init+0x84/0xc0\n    |  do_one_initcall+0x78/0x33c\n    |  kernel_init_freeable+0x2b8/0x51c\n    |  kernel_init+0x24/0x130\n    |  ret_from_fork+0x10/0x20\n    | Code: f0004701 910a0021 aa1403e5 97b91c70 (b9400280)\n    | ---[ end trace 0000000000000000 ]---\n\nSimply check for the struct pointer being NULL before trying to access\nits members, to avoid this situation.\n\nThis was found when a transport doesn't really work (for instance no SMC\nservice), the probe routines then tries to clean up, and triggers a crash."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/firmware/arm_scmi/smc.c"
               ],
               "versions": [
                  {
                     "version": "1dc6558062da",
                     "lessThan": "0d276d9f335f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1dc6558062da",
                     "lessThan": "857f56db8c3a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1dc6558062da",
                     "lessThan": "8ffaa17ccb1e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1dc6558062da",
                     "lessThan": "ead445dd3d68",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1dc6558062da",
                     "lessThan": "f1d71576d2c9",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/firmware/arm_scmi/smc.c"
               ],
               "versions": [
                  {
                     "version": "5.8",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.8",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.83",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.23",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.11",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.2",
                     "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/0d276d9f335f41d6524258d58c0c0241ef9a83a4"
            },
            {
               "url": "https://git.kernel.org/stable/c/857f56db8c3a71f9871922b6984ff74ad588cb2c"
            },
            {
               "url": "https://git.kernel.org/stable/c/8ffaa17ccb1eb1b65cf85db63225a3581c303773"
            },
            {
               "url": "https://git.kernel.org/stable/c/ead445dd3d681020af333649a27306160eee761d"
            },
            {
               "url": "https://git.kernel.org/stable/c/f1d71576d2c9ec8fdb822173fa7f3de79475e9bd"
            }
         ],
         "title": "firmware: arm_scmi: Fix double free in SMC transport cleanup path",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26893",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}