{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/entry-common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "71d6c33fe223255f4416a01514da2c0bc3e283e7",
              "status": "affected",
              "version": "6459b8469753e9feaa8b34691d097cffad905931",
              "versionType": "git"
            },
            {
              "lessThan": "db66629d43b2d12cb43b004a4ca6be1d03228e97",
              "status": "affected",
              "version": "6459b8469753e9feaa8b34691d097cffad905931",
              "versionType": "git"
            },
            {
              "lessThan": "024f4b2e1f874934943eb2d3d288ebc52c79f55c",
              "status": "affected",
              "version": "6459b8469753e9feaa8b34691d097cffad905931",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/entry-common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: entry: avoid kprobe recursion\n\nThe cortex_a76_erratum_1463225_debug_handler() function is called when\nhandling debug exceptions (and synchronous exceptions from BRK\ninstructions), and so is called when a probed function executes. If the\ncompiler does not inline cortex_a76_erratum_1463225_debug_handler(), it\ncan be probed.\n\nIf cortex_a76_erratum_1463225_debug_handler() is probed, any debug\nexception or software breakpoint exception will result in recursive\nexceptions leading to a stack overflow. This can be triggered with the\nftrace multiple_probes selftest, and as per the example splat below.\n\nThis is a regression caused by commit:\n\n  6459b8469753e9fe (\"arm64: entry: consolidate Cortex-A76 erratum 1463225 workaround\")\n\n... which removed the NOKPROBE_SYMBOL() annotation associated with the\nfunction.\n\nMy intent was that cortex_a76_erratum_1463225_debug_handler() would be\ninlined into its caller, el1_dbg(), which is marked noinstr and cannot\nbe probed. Mark cortex_a76_erratum_1463225_debug_handler() as\n__always_inline to ensure this.\n\nExample splat prior to this patch (with recursive entries elided):\n\n| # echo p cortex_a76_erratum_1463225_debug_handler \u003e /sys/kernel/debug/tracing/kprobe_events\n| # echo p do_el0_svc \u003e\u003e /sys/kernel/debug/tracing/kprobe_events\n| # echo 1 \u003e /sys/kernel/debug/tracing/events/kprobes/enable\n| Insufficient stack space to handle exception!\n| ESR: 0x0000000096000047 -- DABT (current EL)\n| FAR: 0xffff800009cefff0\n| Task stack:     [0xffff800009cf0000..0xffff800009cf4000]\n| IRQ stack:      [0xffff800008000000..0xffff800008004000]\n| Overflow stack: [0xffff00007fbc00f0..0xffff00007fbc10f0]\n| CPU: 0 PID: 145 Comm: sh Not tainted 6.0.0 #2\n| Hardware name: linux,dummy-virt (DT)\n| pstate: 604003c5 (nZCv DAIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n| pc : arm64_enter_el1_dbg+0x4/0x20\n| lr : el1_dbg+0x24/0x5c\n| sp : ffff800009cf0000\n| x29: ffff800009cf0000 x28: ffff000002c74740 x27: 0000000000000000\n| x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n| x23: 00000000604003c5 x22: ffff80000801745c x21: 0000aaaac95ac068\n| x20: 00000000f2000004 x19: ffff800009cf0040 x18: 0000000000000000\n| x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\n| x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n| x11: 0000000000000010 x10: ffff800008c87190 x9 : ffff800008ca00d0\n| x8 : 000000000000003c x7 : 0000000000000000 x6 : 0000000000000000\n| x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000000043a4\n| x2 : 00000000f2000004 x1 : 00000000f2000004 x0 : ffff800009cf0040\n| Kernel panic - not syncing: kernel stack overflow\n| CPU: 0 PID: 145 Comm: sh Not tainted 6.0.0 #2\n| Hardware name: linux,dummy-virt (DT)\n| Call trace:\n|  dump_backtrace+0xe4/0x104\n|  show_stack+0x18/0x4c\n|  dump_stack_lvl+0x64/0x7c\n|  dump_stack+0x18/0x38\n|  panic+0x14c/0x338\n|  test_taint+0x0/0x2c\n|  panic_bad_stack+0x104/0x118\n|  handle_bad_stack+0x34/0x48\n|  __bad_stack+0x78/0x7c\n|  arm64_enter_el1_dbg+0x4/0x20\n|  el1h_64_sync_handler+0x40/0x98\n|  el1h_64_sync+0x64/0x68\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\n...\n|  el1h_64_sync_handler+0x40/0x98\n|  el1h_64_sync+0x64/0x68\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\n...\n|  el1h_64_sync_handler+0x40/0x98\n|  el1h_64_sync+0x64/0x68\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\n|  el1h_64_sync_handler+0x40/0x98\n|  el1h_64_sync+0x64/0x68\n|  do_el0_svc+0x0/0x28\n|  el0t_64_sync_handler+0x84/0xf0\n|  el0t_64_sync+0x18c/0x190\n| Kernel Offset: disabled\n| CPU features: 0x0080,00005021,19001080\n| Memory Limit: none\n| ---[ end Kernel panic - not syncing: kernel stack overflow ]---\n\nWith this patch, cortex_a76_erratum_1463225_debug_handler() is inlined\ninto el1_dbg(), and el1_dbg() cannot be probed:\n\n| # echo p cortex_a76_erratum_1463225_debug_handler \u003e /sys/kernel/debug/tracing/kprobe_events\n| sh: write error: No such file or directory\n| # grep -w cortex_a76_errat\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-01T14:10:33.183Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/71d6c33fe223255f4416a01514da2c0bc3e283e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/db66629d43b2d12cb43b004a4ca6be1d03228e97"
        },
        {
          "url": "https://git.kernel.org/stable/c/024f4b2e1f874934943eb2d3d288ebc52c79f55c"
        }
      ],
      "title": "arm64: entry: avoid kprobe recursion",
      "x_generator": {
        "engine": "bippy-1.1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49888",
    "datePublished": "2025-05-01T14:10:33.183Z",
    "dateReserved": "2025-05-01T14:05:17.242Z",
    "dateUpdated": "2025-05-01T14:10:33.183Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49888\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T15:16:13.790\",\"lastModified\":\"2025-05-01T15:16:13.790\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: entry: avoid kprobe recursion\\n\\nThe cortex_a76_erratum_1463225_debug_handler() function is called when\\nhandling debug exceptions (and synchronous exceptions from BRK\\ninstructions), and so is called when a probed function executes. If the\\ncompiler does not inline cortex_a76_erratum_1463225_debug_handler(), it\\ncan be probed.\\n\\nIf cortex_a76_erratum_1463225_debug_handler() is probed, any debug\\nexception or software breakpoint exception will result in recursive\\nexceptions leading to a stack overflow. This can be triggered with the\\nftrace multiple_probes selftest, and as per the example splat below.\\n\\nThis is a regression caused by commit:\\n\\n  6459b8469753e9fe (\\\"arm64: entry: consolidate Cortex-A76 erratum 1463225 workaround\\\")\\n\\n... which removed the NOKPROBE_SYMBOL() annotation associated with the\\nfunction.\\n\\nMy intent was that cortex_a76_erratum_1463225_debug_handler() would be\\ninlined into its caller, el1_dbg(), which is marked noinstr and cannot\\nbe probed. Mark cortex_a76_erratum_1463225_debug_handler() as\\n__always_inline to ensure this.\\n\\nExample splat prior to this patch (with recursive entries elided):\\n\\n| # echo p cortex_a76_erratum_1463225_debug_handler \u003e /sys/kernel/debug/tracing/kprobe_events\\n| # echo p do_el0_svc \u003e\u003e /sys/kernel/debug/tracing/kprobe_events\\n| # echo 1 \u003e /sys/kernel/debug/tracing/events/kprobes/enable\\n| Insufficient stack space to handle exception!\\n| ESR: 0x0000000096000047 -- DABT (current EL)\\n| FAR: 0xffff800009cefff0\\n| Task stack:     [0xffff800009cf0000..0xffff800009cf4000]\\n| IRQ stack:      [0xffff800008000000..0xffff800008004000]\\n| Overflow stack: [0xffff00007fbc00f0..0xffff00007fbc10f0]\\n| CPU: 0 PID: 145 Comm: sh Not tainted 6.0.0 #2\\n| Hardware name: linux,dummy-virt (DT)\\n| pstate: 604003c5 (nZCv DAIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n| pc : arm64_enter_el1_dbg+0x4/0x20\\n| lr : el1_dbg+0x24/0x5c\\n| sp : ffff800009cf0000\\n| x29: ffff800009cf0000 x28: ffff000002c74740 x27: 0000000000000000\\n| x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\\n| x23: 00000000604003c5 x22: ffff80000801745c x21: 0000aaaac95ac068\\n| x20: 00000000f2000004 x19: ffff800009cf0040 x18: 0000000000000000\\n| x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\\n| x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\\n| x11: 0000000000000010 x10: ffff800008c87190 x9 : ffff800008ca00d0\\n| x8 : 000000000000003c x7 : 0000000000000000 x6 : 0000000000000000\\n| x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000000043a4\\n| x2 : 00000000f2000004 x1 : 00000000f2000004 x0 : ffff800009cf0040\\n| Kernel panic - not syncing: kernel stack overflow\\n| CPU: 0 PID: 145 Comm: sh Not tainted 6.0.0 #2\\n| Hardware name: linux,dummy-virt (DT)\\n| Call trace:\\n|  dump_backtrace+0xe4/0x104\\n|  show_stack+0x18/0x4c\\n|  dump_stack_lvl+0x64/0x7c\\n|  dump_stack+0x18/0x38\\n|  panic+0x14c/0x338\\n|  test_taint+0x0/0x2c\\n|  panic_bad_stack+0x104/0x118\\n|  handle_bad_stack+0x34/0x48\\n|  __bad_stack+0x78/0x7c\\n|  arm64_enter_el1_dbg+0x4/0x20\\n|  el1h_64_sync_handler+0x40/0x98\\n|  el1h_64_sync+0x64/0x68\\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\\n...\\n|  el1h_64_sync_handler+0x40/0x98\\n|  el1h_64_sync+0x64/0x68\\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\\n...\\n|  el1h_64_sync_handler+0x40/0x98\\n|  el1h_64_sync+0x64/0x68\\n|  cortex_a76_erratum_1463225_debug_handler+0x0/0x34\\n|  el1h_64_sync_handler+0x40/0x98\\n|  el1h_64_sync+0x64/0x68\\n|  do_el0_svc+0x0/0x28\\n|  el0t_64_sync_handler+0x84/0xf0\\n|  el0t_64_sync+0x18c/0x190\\n| Kernel Offset: disabled\\n| CPU features: 0x0080,00005021,19001080\\n| Memory Limit: none\\n| ---[ end Kernel panic - not syncing: kernel stack overflow ]---\\n\\nWith this patch, cortex_a76_erratum_1463225_debug_handler() is inlined\\ninto el1_dbg(), and el1_dbg() cannot be probed:\\n\\n| # echo p cortex_a76_erratum_1463225_debug_handler \u003e /sys/kernel/debug/tracing/kprobe_events\\n| sh: write error: No such file or directory\\n| # grep -w cortex_a76_errat\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/024f4b2e1f874934943eb2d3d288ebc52c79f55c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/71d6c33fe223255f4416a01514da2c0bc3e283e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db66629d43b2d12cb43b004a4ca6be1d03228e97\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}