{"id":25621,"date":"2026-09-18T04:31:39","date_gmt":"2026-09-17T20:31:39","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90212"},"modified":"2026-09-18T04:31:39","modified_gmt":"2026-09-17T20:31:39","slug":"cve-2026-90212","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90212","title":{"rendered":"CVE-2026-90212 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\narm64\/efi: Avoid volu"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>arm64\/efi: Avoid voluntary preemption with efi_mm installed<\/p>\n<p>Gus reports a bad kernel memory access when using software PAN<br \/>\n(CONFIG_ARM64_SW_TTBR0_PAN=y) on a machine with support for EFI runtime<br \/>\nservices:<\/p>\n<p>  Unable to handle kernel access to user memory outside uaccess routines<br \/>\n    at virtual address 00000000f322ff30<br \/>\n  Mem abort info:<br \/>\n    ESR = 0x0000000096000004<br \/>\n    FSC = 0x04: level 0 translation fault<br \/>\n  Internal error: Oops: 0000000096000004 [#1]  SMP<br \/>\n  Workqueue: efi_rts_wq efi_call_rts<br \/>\n  pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=&#8211;)<br \/>\n  pc : efi_call_rts+0xd8\/0x288<br \/>\n  Call trace:<br \/>\n   efi_call_rts+0xd8\/0x288 (P)<br \/>\n   process_one_work+0x178\/0x4f8<br \/>\n   worker_thread+0x194\/0x328<\/p>\n<p>This is because the fpsimd context management code called from<br \/>\n__efi_fpsimd_begin() can preempt voluntarily, returning later to the EFI<br \/>\ncode with an incorrect value for TTBR0_EL1 thanks to the deferred mm<br \/>\nswitching used by the software PAN implementation.<\/p>\n<p>Since EFI runtime services cannot preempt voluntarily and because the<br \/>\nfpsimd switching code does not rely on the TTBR0_EL1 mappings, simply<br \/>\nreorder the fpsimd switch so that it occurs before we change the<br \/>\npage-table.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>arm64\/efi: Avoid voluntary preemption with efi_mm installed<\/p>\n<p>Gus reports a bad kernel memory access when using software PAN<br \/>\n(CONFIG<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25621","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}