{"api_version":"1","generated_at":"2026-08-15T16:27:35+00:00","cve":"CVE-2026-72215","urls":{"html":"https://cve.report/CVE-2026-72215","api":"https://cve.report/api/cve/CVE-2026-72215.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72215","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72215"},"summary":{"title":"MIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()\n\nIn 64-bit configurations calling any firmware entry points from a kernel\nthread other than the initial one will result in a situation where the\nstack has been placed in the XKPHYS 64-bit memory segment.\n\nConsequently the stack pointer is no longer a 32-bit value and when the\n32-bit firmware code called uses 32-bit ALU operations to manipulate the\nstack pointer, the calculated result is incorrect (in fact in the 64-bit\nMIPS ISA almost all 32-bit ALU operations will produce an unpredictable\nresult when executed on 64-bit data) and control goes astray.\n\nThis may happen when no final console driver has been enabled in the\nconfiguration and consequently the initial console continues being used\nlate into bootstrap, or with an upcoming change that will switch the zs\ndriver to use a platform device, which in turn will make the console\nhandover happen only after other kernel threads have already been\nstarted, and the kernel will hang at:\n\n  pid_max: default: 32768 minimum: 301\n\nor somewhat later, but always before:\n\n  cblist_init_generic: Setting adjustable number of callback queues.\n\nhas been printed.\n\nIt seems that only the prom_printf() entry point is affected.  Of all\nthe other entry points wired only rex_slot_address() and rex_gettcinfo()\nare called from a kernel thread other than the initial one, specifically\nkernel_init(), and they are leaf functions that do no business with the\nstack, having worked with no issue ever since 64-bit support was added\nfor the platform back in 2002.\n\nTo address this issue then, arrange for the stack to be switched in the\no32 wrapper as required for prom_printf() only, by supplying call_o32()\nwith a pointer to a chunk of initdata space, which is placed in the\nCKSEG0 32-bit compatibility segment, observing that prom_printf() is\nonly called from console output handler and therefore with the console\nlock held, implying no need for this code to be reentrant.\n\nOther firmware entry points may be called with interrupts enabled and no\nlock held, and may therefore require that call_o32() be reentrant.  They\ntrigger no issue at this point and \"if it ain't broke, don't fix it,\" so\njust leave them alone.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:40","updated_at":"2026-08-15 06:21:40"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9cd4a8ed12d2a6313592e43c14cca5eca6717bee","name":"https://git.kernel.org/stable/c/9cd4a8ed12d2a6313592e43c14cca5eca6717bee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1ed18b5c3be9657fe288fa4dae0bef2470598683","name":"https://git.kernel.org/stable/c/1ed18b5c3be9657fe288fa4dae0bef2470598683","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d828bca84311e278093e60b2864a54f4bbb0c2ad","name":"https://git.kernel.org/stable/c/d828bca84311e278093e60b2864a54f4bbb0c2ad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/27857db30c98583e12dd8d939ba2370bce08a5be","name":"https://git.kernel.org/stable/c/27857db30c98583e12dd8d939ba2370bce08a5be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3394757c5d3970ab36d2aafa6dd40952b43f0d16","name":"https://git.kernel.org/stable/c/3394757c5d3970ab36d2aafa6dd40952b43f0d16","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5ff79e8bdc75db51e30298a75939e2308e7658e0","name":"https://git.kernel.org/stable/c/5ff79e8bdc75db51e30298a75939e2308e7658e0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3ae86630b94f72bf4012c6322f81f622dc4fdf24","name":"https://git.kernel.org/stable/c/3ae86630b94f72bf4012c6322f81f622dc4fdf24","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3fd2d358df0ca712183509cbbed6a16bde1d17e","name":"https://git.kernel.org/stable/c/d3fd2d358df0ca712183509cbbed6a16bde1d17e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72215","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72215","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 9cd4a8ed12d2a6313592e43c14cca5eca6717bee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 3394757c5d3970ab36d2aafa6dd40952b43f0d16 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 1ed18b5c3be9657fe288fa4dae0bef2470598683 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 27857db30c98583e12dd8d939ba2370bce08a5be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/mips/dec/prom/init.c","arch/mips/include/asm/dec/prom.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9cd4a8ed12d2a6313592e43c14cca5eca6717bee","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"3394757c5d3970ab36d2aafa6dd40952b43f0d16","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"1ed18b5c3be9657fe288fa4dae0bef2470598683","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"27857db30c98583e12dd8d939ba2370bce08a5be","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"d828bca84311e278093e60b2864a54f4bbb0c2ad","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"d3fd2d358df0ca712183509cbbed6a16bde1d17e","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"3ae86630b94f72bf4012c6322f81f622dc4fdf24","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"5ff79e8bdc75db51e30298a75939e2308e7658e0","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/mips/dec/prom/init.c","arch/mips/include/asm/dec/prom.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.12"},{"lessThan":"2.6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"2.6.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()\n\nIn 64-bit configurations calling any firmware entry points from a kernel\nthread other than the initial one will result in a situation where the\nstack has been placed in the XKPHYS 64-bit memory segment.\n\nConsequently the stack pointer is no longer a 32-bit value and when the\n32-bit firmware code called uses 32-bit ALU operations to manipulate the\nstack pointer, the calculated result is incorrect (in fact in the 64-bit\nMIPS ISA almost all 32-bit ALU operations will produce an unpredictable\nresult when executed on 64-bit data) and control goes astray.\n\nThis may happen when no final console driver has been enabled in the\nconfiguration and consequently the initial console continues being used\nlate into bootstrap, or with an upcoming change that will switch the zs\ndriver to use a platform device, which in turn will make the console\nhandover happen only after other kernel threads have already been\nstarted, and the kernel will hang at:\n\n  pid_max: default: 32768 minimum: 301\n\nor somewhat later, but always before:\n\n  cblist_init_generic: Setting adjustable number of callback queues.\n\nhas been printed.\n\nIt seems that only the prom_printf() entry point is affected.  Of all\nthe other entry points wired only rex_slot_address() and rex_gettcinfo()\nare called from a kernel thread other than the initial one, specifically\nkernel_init(), and they are leaf functions that do no business with the\nstack, having worked with no issue ever since 64-bit support was added\nfor the platform back in 2002.\n\nTo address this issue then, arrange for the stack to be switched in the\no32 wrapper as required for prom_printf() only, by supplying call_o32()\nwith a pointer to a chunk of initdata space, which is placed in the\nCKSEG0 32-bit compatibility segment, observing that prom_printf() is\nonly called from console output handler and therefore with the console\nlock held, implying no need for this code to be reentrant.\n\nOther firmware entry points may be called with interrupts enabled and no\nlock held, and may therefore require that call_o32() be reentrant.  They\ntrigger no issue at this point and \"if it ain't broke, don't fix it,\" so\njust leave them alone."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:54:09.352Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9cd4a8ed12d2a6313592e43c14cca5eca6717bee"},{"url":"https://git.kernel.org/stable/c/3394757c5d3970ab36d2aafa6dd40952b43f0d16"},{"url":"https://git.kernel.org/stable/c/1ed18b5c3be9657fe288fa4dae0bef2470598683"},{"url":"https://git.kernel.org/stable/c/27857db30c98583e12dd8d939ba2370bce08a5be"},{"url":"https://git.kernel.org/stable/c/d828bca84311e278093e60b2864a54f4bbb0c2ad"},{"url":"https://git.kernel.org/stable/c/d3fd2d358df0ca712183509cbbed6a16bde1d17e"},{"url":"https://git.kernel.org/stable/c/3ae86630b94f72bf4012c6322f81f622dc4fdf24"},{"url":"https://git.kernel.org/stable/c/5ff79e8bdc75db51e30298a75939e2308e7658e0"}],"title":"MIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72215","datePublished":"2026-08-15T05:54:09.352Z","dateReserved":"2026-08-09T03:40:39.912Z","dateUpdated":"2026-08-15T05:54:09.352Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:40","lastModifiedDate":"2026-08-15 06:21:40","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72215","Ordinal":"1","Title":"MIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()","CVE":"CVE-2026-72215","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72215","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()\n\nIn 64-bit configurations calling any firmware entry points from a kernel\nthread other than the initial one will result in a situation where the\nstack has been placed in the XKPHYS 64-bit memory segment.\n\nConsequently the stack pointer is no longer a 32-bit value and when the\n32-bit firmware code called uses 32-bit ALU operations to manipulate the\nstack pointer, the calculated result is incorrect (in fact in the 64-bit\nMIPS ISA almost all 32-bit ALU operations will produce an unpredictable\nresult when executed on 64-bit data) and control goes astray.\n\nThis may happen when no final console driver has been enabled in the\nconfiguration and consequently the initial console continues being used\nlate into bootstrap, or with an upcoming change that will switch the zs\ndriver to use a platform device, which in turn will make the console\nhandover happen only after other kernel threads have already been\nstarted, and the kernel will hang at:\n\n  pid_max: default: 32768 minimum: 301\n\nor somewhat later, but always before:\n\n  cblist_init_generic: Setting adjustable number of callback queues.\n\nhas been printed.\n\nIt seems that only the prom_printf() entry point is affected.  Of all\nthe other entry points wired only rex_slot_address() and rex_gettcinfo()\nare called from a kernel thread other than the initial one, specifically\nkernel_init(), and they are leaf functions that do no business with the\nstack, having worked with no issue ever since 64-bit support was added\nfor the platform back in 2002.\n\nTo address this issue then, arrange for the stack to be switched in the\no32 wrapper as required for prom_printf() only, by supplying call_o32()\nwith a pointer to a chunk of initdata space, which is placed in the\nCKSEG0 32-bit compatibility segment, observing that prom_printf() is\nonly called from console output handler and therefore with the console\nlock held, implying no need for this code to be reentrant.\n\nOther firmware entry points may be called with interrupts enabled and no\nlock held, and may therefore require that call_o32() be reentrant.  They\ntrigger no issue at this point and \"if it ain't broke, don't fix it,\" so\njust leave them alone.","Type":"Description","Title":"MIPS: DEC: Ensure 32-bit stack location for o32 prom_printf()"}]}}}