CVE-2024-26670 (GCVE-0-2024-26670)

Vulnerability from cvelistv5 – Published: 2024-04-02 06:43 – Updated: 2026-05-23 15:36
VLAI
Title
arm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD Currently the ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround isn't quite right, as it is supposed to be applied after the last explicit memory access, but is immediately followed by an LDR. The ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround is used to handle Cortex-A520 erratum 2966298 and Cortex-A510 erratum 3117295, which are described in: * https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en * https://developer.arm.com/documentation/SDEN1873361/1600/?lang=en In both cases the workaround is described as: | If pagetable isolation is disabled, the context switch logic in the | kernel can be updated to execute the following sequence on affected | cores before exiting to EL0, and after all explicit memory accesses: | | 1. A non-shareable TLBI to any context and/or address, including | unused contexts or addresses, such as a `TLBI VALE1 Xzr`. | | 2. A DSB NSH to guarantee completion of the TLBI. The important part being that the TLBI+DSB must be placed "after all explicit memory accesses". Unfortunately, as-implemented, the TLBI+DSB is immediately followed by an LDR, as we have: | alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternative_else_nop_endif | alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0 | ldr lr, [sp, #S_LR] | add sp, sp, #PT_REGS_SIZE // restore sp | eret | alternative_else_nop_endif | | [ ... KPTI exception return path ... ] This patch fixes this by reworking the logic to place the TLBI+DSB immediately before the ERET, after all explicit memory accesses. The ERET is currently in a separate alternative block, and alternatives cannot be nested. To account for this, the alternative block for ARM64_UNMAP_KERNEL_AT_EL0 is replaced with a single alternative branch to skip the KPTI logic, with the new shape of the logic being: | alternative_insn "b .L_skip_tramp_exit_\@", nop, ARM64_UNMAP_KERNEL_AT_EL0 | [ ... KPTI exception return path ... ] | .L_skip_tramp_exit_\@: | | ldr lr, [sp, #S_LR] | add sp, sp, #PT_REGS_SIZE // restore sp | | alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternative_else_nop_endif | eret The new structure means that the workaround is only applied when KPTI is not in use; this is fine as noted in the documented implications of the erratum: | Pagetable isolation between EL0 and higher level ELs prevents the | issue from occurring. ... and as per the workaround description quoted above, the workaround is only necessary "If pagetable isolation is disabled".
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 18:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 471470bc7052d28ce125901877dd10e4c048e513 , < 58eb5c07f41704464b9acc09ab0707b6769db6c0 (git)
Affected: 471470bc7052d28ce125901877dd10e4c048e513 , < baa0aaac16432019651e0d60c41cd34a0c3c3477 (git)
Affected: 471470bc7052d28ce125901877dd10e4c048e513 , < 832dd634bd1b4e3bbe9f10b9c9ba5db6f6f2b97f (git)
Affected: 6e3ae2927b432a3b7c8374f14dbc1bd9ebe4372c (git)
Affected: 32b0a4ffcaea44a00a61e40c0d1bcc50362aee25 (git)
Affected: 6.1.57 , < 6.2 (semver)
Affected: 6.5.7 , < 6.6 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n\nCurrently the ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround isn\u0027t\nquite right, as it is supposed to be applied after the last explicit\nmemory access, but is immediately followed by an LDR.\n\nThe ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround is used to\nhandle Cortex-A520 erratum 2966298 and Cortex-A510 erratum 3117295,\nwhich are described in:\n\n* https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en\n* https://developer.arm.com/documentation/SDEN1873361/1600/?lang=en\n\nIn both cases the workaround is described as:\n\n| If pagetable isolation is disabled, the context switch logic in the\n| kernel can be updated to execute the following sequence on affected\n| cores before exiting to EL0, and after all explicit memory accesses:\n|\n| 1. A non-shareable TLBI to any context and/or address, including\n|    unused contexts or addresses, such as a `TLBI VALE1 Xzr`.\n|\n| 2. A DSB NSH to guarantee completion of the TLBI.\n\nThe important part being that the TLBI+DSB must be placed \"after all\nexplicit memory accesses\".\n\nUnfortunately, as-implemented, the TLBI+DSB is immediately followed by\nan LDR, as we have:\n\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n| \teret\n| alternative_else_nop_endif\n|\n| [ ... KPTI exception return path ... ]\n\nThis patch fixes this by reworking the logic to place the TLBI+DSB\nimmediately before the ERET, after all explicit memory accesses.\n\nThe ERET is currently in a separate alternative block, and alternatives\ncannot be nested. To account for this, the alternative block for\nARM64_UNMAP_KERNEL_AT_EL0 is replaced with a single alternative branch\nto skip the KPTI logic, with the new shape of the logic being:\n\n| alternative_insn \"b .L_skip_tramp_exit_\\@\", nop, ARM64_UNMAP_KERNEL_AT_EL0\n| \t[ ... KPTI exception return path ... ]\n| .L_skip_tramp_exit_\\@:\n|\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n|\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| \teret\n\nThe new structure means that the workaround is only applied when KPTI is\nnot in use; this is fine as noted in the documented implications of the\nerratum:\n\n| Pagetable isolation between EL0 and higher level ELs prevents the\n| issue from occurring.\n\n... and as per the workaround description quoted above, the workaround\nis only necessary \"If pagetable isolation is disabled\"."
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          "lang": "es",
          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: entrada: arreglar ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD Actualmente, la soluci\u00f3n alternativa ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD no es del todo correcta, ya que se supone que debe aplicarse despu\u00e9s del \u00faltimo acceso expl\u00edcito a la memoria, pero va seguida inmediatamente por un LDR. La soluci\u00f3n alternativa ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD se utiliza para manejar las erratas Cortex-A520 2966298 y Cortex-A510 erratas 3117295, que se describen en: * https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en * https:// desarrollador.arm.com/documentation/SDEN1873361/1600/?lang=en En ambos casos, la soluci\u00f3n se describe como: | Si el aislamiento de la tabla de p\u00e1ginas est\u00e1 deshabilitado, la l\u00f3gica de cambio de contexto en | El kernel se puede actualizar para ejecutar la siguiente secuencia en los afectados | n\u00facleos antes de salir a EL0 y despu\u00e9s de todos los accesos expl\u00edcitos a la memoria: | | 1. Un TLBI que no se puede compartir en cualquier contexto y/o direcci\u00f3n, incluido | contextos o direcciones no utilizados, como `TLBI VALE1 Xzr`. | | 2. Un OSD NSH para garantizar la finalizaci\u00f3n del TLBI. La parte importante es que el TLBI+DSB debe colocarse \"despu\u00e9s de todos los accesos expl\u00edcitos a la memoria\". Desafortunadamente, tal como se implement\u00f3, el TLBI+DSB es seguido inmediatamente por un LDR, como tenemos: | Alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternativa_else_nop_endif | alternativa_si_no ARM64_UNMAP_KERNEL_AT_EL0 | ldr lr, [sp, #S_LR] | agregar sp, sp, #PT_REGS_SIZE // restaurar sp | eremita | alternativa_else_nop_endif | | [... Ruta de retorno de excepci\u00f3n KPTI...] Este parche soluciona este problema reelaborando la l\u00f3gica para colocar TLBI+DSB inmediatamente antes de ERET, despu\u00e9s de todos los accesos expl\u00edcitos a la memoria. El ERET se encuentra actualmente en un bloque alternativo separado y las alternativas no se pueden anidar. Para tener en cuenta esto, el bloque alternativo para ARM64_UNMAP_KERNEL_AT_EL0 se reemplaza con una \u00fanica rama alternativa para omitir la l\u00f3gica KPTI, siendo la nueva forma de la l\u00f3gica: | Alternative_insn \"b .L_skip_tramp_exit_\\@\", nop, ARM64_UNMAP_KERNEL_AT_EL0 | [... Ruta de retorno de excepci\u00f3n KPTI...] | .L_skip_tramp_exit_\\@: | | ldr lr, [sp, #S_LR] | agregar sp, sp, #PT_REGS_SIZE // restaurar sp | | Alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternativa_else_nop_endif | eret La nueva estructura significa que la soluci\u00f3n alternativa s\u00f3lo se aplica cuando KPTI no est\u00e1 en uso; esto est\u00e1 bien, como se indica en las implicaciones documentadas de la fe de erratas: | El aislamiento de la tabla de paginaci\u00f3n entre EL0 y los EL de nivel superior evita que | que ocurra el problema. ... y seg\u00fan la descripci\u00f3n de la soluci\u00f3n citada anteriormente, la soluci\u00f3n s\u00f3lo es necesaria \"si el aislamiento de la tabla de p\u00e1ginas est\u00e1 deshabilitado\"."
        }
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      "lastModified": "2024-11-21T09:02:48.597",
      "published": "2024-04-02T07:15:43.760",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n\nCurrently the ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround isn\u0027t\nquite right, as it is supposed to be applied after the last explicit\nmemory access, but is immediately followed by an LDR.\n\nThe ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround is used to\nhandle Cortex-A520 erratum 2966298 and Cortex-A510 erratum 3117295,\nwhich are described in:\n\n* https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en\n* https://developer.arm.com/documentation/SDEN1873361/1600/?lang=en\n\nIn both cases the workaround is described as:\n\n| If pagetable isolation is disabled, the context switch logic in the\n| kernel can be updated to execute the following sequence on affected\n| cores before exiting to EL0, and after all explicit memory accesses:\n|\n| 1. A non-shareable TLBI to any context and/or address, including\n|    unused contexts or addresses, such as a `TLBI VALE1 Xzr`.\n|\n| 2. A DSB NSH to guarantee completion of the TLBI.\n\nThe important part being that the TLBI+DSB must be placed \"after all\nexplicit memory accesses\".\n\nUnfortunately, as-implemented, the TLBI+DSB is immediately followed by\nan LDR, as we have:\n\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n| \teret\n| alternative_else_nop_endif\n|\n| [ ... KPTI exception return path ... ]\n\nThis patch fixes this by reworking the logic to place the TLBI+DSB\nimmediately before the ERET, after all explicit memory accesses.\n\nThe ERET is currently in a separate alternative block, and alternatives\ncannot be nested. To account for this, the alternative block for\nARM64_UNMAP_KERNEL_AT_EL0 is replaced with a single alternative branch\nto skip the KPTI logic, with the new shape of the logic being:\n\n| alternative_insn \"b .L_skip_tramp_exit_\\@\", nop, ARM64_UNMAP_KERNEL_AT_EL0\n| \t[ ... KPTI exception return path ... ]\n| .L_skip_tramp_exit_\\@:\n|\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n|\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| \teret\n\nThe new structure means that the workaround is only applied when KPTI is\nnot in use; this is fine as noted in the documented implications of the\nerratum:\n\n| Pagetable isolation between EL0 and higher level ELs prevents the\n| issue from occurring.\n\n... and as per the workaround description quoted above, the workaround\nis only necessary \"If pagetable isolation is disabled\"."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: entrada: arreglar ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD Actualmente, la soluci\u00f3n alternativa ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD no es del todo correcta, ya que se supone que debe aplicarse despu\u00e9s del \u00faltimo acceso expl\u00edcito a la memoria, pero va seguida inmediatamente por un LDR. La soluci\u00f3n alternativa ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD se utiliza para manejar las erratas Cortex-A520 2966298 y Cortex-A510 erratas 3117295, que se describen en: * https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en * https:// desarrollador.arm.com/documentation/SDEN1873361/1600/?lang=en En ambos casos, la soluci\u00f3n se describe como: | Si el aislamiento de la tabla de p\u00e1ginas est\u00e1 deshabilitado, la l\u00f3gica de cambio de contexto en | El kernel se puede actualizar para ejecutar la siguiente secuencia en los afectados | n\u00facleos antes de salir a EL0 y despu\u00e9s de todos los accesos expl\u00edcitos a la memoria: | | 1. Un TLBI que no se puede compartir en cualquier contexto y/o direcci\u00f3n, incluido | contextos o direcciones no utilizados, como `TLBI VALE1 Xzr`. | | 2. Un OSD NSH para garantizar la finalizaci\u00f3n del TLBI. La parte importante es que el TLBI+DSB debe colocarse \"despu\u00e9s de todos los accesos expl\u00edcitos a la memoria\". Desafortunadamente, tal como se implement\u00f3, el TLBI+DSB es seguido inmediatamente por un LDR, como tenemos: | Alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternativa_else_nop_endif | alternativa_si_no ARM64_UNMAP_KERNEL_AT_EL0 | ldr lr, [sp, #S_LR] | agregar sp, sp, #PT_REGS_SIZE // restaurar sp | eremita | alternativa_else_nop_endif | | [... Ruta de retorno de excepci\u00f3n KPTI...] Este parche soluciona este problema reelaborando la l\u00f3gica para colocar TLBI+DSB inmediatamente antes de ERET, despu\u00e9s de todos los accesos expl\u00edcitos a la memoria. El ERET se encuentra actualmente en un bloque alternativo separado y las alternativas no se pueden anidar. Para tener en cuenta esto, el bloque alternativo para ARM64_UNMAP_KERNEL_AT_EL0 se reemplaza con una \u00fanica rama alternativa para omitir la l\u00f3gica KPTI, siendo la nueva forma de la l\u00f3gica: | Alternative_insn \"b .L_skip_tramp_exit_\\@\", nop, ARM64_UNMAP_KERNEL_AT_EL0 | [... Ruta de retorno de excepci\u00f3n KPTI...] | .L_skip_tramp_exit_\\@: | | ldr lr, [sp, #S_LR] | agregar sp, sp, #PT_REGS_SIZE // restaurar sp | | Alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD | tlbi vale1, xzr | dsb nsh | alternativa_else_nop_endif | eret La nueva estructura significa que la soluci\u00f3n alternativa s\u00f3lo se aplica cuando KPTI no est\u00e1 en uso; esto est\u00e1 bien, como se indica en las implicaciones documentadas de la fe de erratas: | El aislamiento de la tabla de paginaci\u00f3n entre EL0 y los EL de nivel superior evita que | que ocurra el problema. ... y seg\u00fan la descripci\u00f3n de la soluci\u00f3n citada anteriormente, la soluci\u00f3n s\u00f3lo es necesaria \"si el aislamiento de la tabla de p\u00e1ginas est\u00e1 deshabilitado\"."
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n\nCurrently the ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround isn\u0027t\nquite right, as it is supposed to be applied after the last explicit\nmemory access, but is immediately followed by an LDR.\n\nThe ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD workaround is used to\nhandle Cortex-A520 erratum 2966298 and Cortex-A510 erratum 3117295,\nwhich are described in:\n\n* https://developer.arm.com/documentation/SDEN2444153/0600/?lang=en\n* https://developer.arm.com/documentation/SDEN1873361/1600/?lang=en\n\nIn both cases the workaround is described as:\n\n| If pagetable isolation is disabled, the context switch logic in the\n| kernel can be updated to execute the following sequence on affected\n| cores before exiting to EL0, and after all explicit memory accesses:\n|\n| 1. A non-shareable TLBI to any context and/or address, including\n|    unused contexts or addresses, such as a `TLBI VALE1 Xzr`.\n|\n| 2. A DSB NSH to guarantee completion of the TLBI.\n\nThe important part being that the TLBI+DSB must be placed \"after all\nexplicit memory accesses\".\n\nUnfortunately, as-implemented, the TLBI+DSB is immediately followed by\nan LDR, as we have:\n\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n| \teret\n| alternative_else_nop_endif\n|\n| [ ... KPTI exception return path ... ]\n\nThis patch fixes this by reworking the logic to place the TLBI+DSB\nimmediately before the ERET, after all explicit memory accesses.\n\nThe ERET is currently in a separate alternative block, and alternatives\ncannot be nested. To account for this, the alternative block for\nARM64_UNMAP_KERNEL_AT_EL0 is replaced with a single alternative branch\nto skip the KPTI logic, with the new shape of the logic being:\n\n| alternative_insn \"b .L_skip_tramp_exit_\\@\", nop, ARM64_UNMAP_KERNEL_AT_EL0\n| \t[ ... KPTI exception return path ... ]\n| .L_skip_tramp_exit_\\@:\n|\n| \tldr\tlr, [sp, #S_LR]\n| \tadd\tsp, sp, #PT_REGS_SIZE\t\t// restore sp\n|\n| alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD\n| \ttlbi\tvale1, xzr\n| \tdsb\tnsh\n| alternative_else_nop_endif\n| \teret\n\nThe new structure means that the workaround is only applied when KPTI is\nnot in use; this is fine as noted in the documented implications of the\nerratum:\n\n| Pagetable isolation between EL0 and higher level ELs prevents the\n| issue from occurring.\n\n... and as per the workaround description quoted above, the workaround\nis only necessary \"If pagetable isolation is disabled\"."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:01:55.161Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/58eb5c07f41704464b9acc09ab0707b6769db6c0"
            },
            {
              "url": "https://git.kernel.org/stable/c/baa0aaac16432019651e0d60c41cd34a0c3c3477"
            },
            {
              "url": "https://git.kernel.org/stable/c/832dd634bd1b4e3bbe9f10b9c9ba5db6f6f2b97f"
            }
          ],
          "title": "arm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26670",
        "datePublished": "2024-04-02T06:43:31.201Z",
        "dateReserved": "2024-02-19T14:20:24.150Z",
        "dateUpdated": "2026-05-11T20:01:55.161Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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