CVE-2026-43277

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> APEI/GHES: ensure that won&amp;#39;t go past CPER allocated record<br /> <br /> The logic at ghes_new() prevents allocating too large records, by<br /> checking if they&amp;#39;re bigger than GHES_ESTATUS_MAX_SIZE (currently, 64KB).<br /> Yet, the allocation is done with the actual number of pages from the<br /> CPER bios table location, which can be smaller.<br /> <br /> Yet, a bad firmware could send data with a different size, which might<br /> be bigger than the allocated memory, causing an OOPS:<br /> <br /> Unable to handle kernel paging request at virtual address fff00000f9b40000<br /> Mem abort info:<br /> ESR = 0x0000000096000007<br /> EC = 0x25: DABT (current EL), IL = 32 bits<br /> SET = 0, FnV = 0<br /> EA = 0, S1PTW = 0<br /> FSC = 0x07: level 3 translation fault<br /> Data abort info:<br /> ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000<br /> CM = 0, WnR = 0, TnD = 0, TagAccess = 0<br /> GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0<br /> swapper pgtable: 4k pages, 52-bit VAs, pgdp=000000008ba16000<br /> [fff00000f9b40000] pgd=180000013ffff403, p4d=180000013fffe403, pud=180000013f85b403, pmd=180000013f68d403, pte=0000000000000000<br /> Internal error: Oops: 0000000096000007 [#1] SMP<br /> Modules linked in:<br /> CPU: 0 UID: 0 PID: 303 Comm: kworker/0:1 Not tainted 6.19.0-rc1-00002-gda407d200220 #34 PREEMPT<br /> Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022<br /> Workqueue: kacpi_notify acpi_os_execute_deferred<br /> pstate: 214020c5 (nzCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)<br /> pc : hex_dump_to_buffer+0x30c/0x4a0<br /> lr : hex_dump_to_buffer+0x328/0x4a0<br /> sp : ffff800080e13880<br /> x29: ffff800080e13880 x28: ffffac9aba86f6a8 x27: 0000000000000083<br /> x26: fff00000f9b3fffc x25: 0000000000000004 x24: 0000000000000004<br /> x23: ffff800080e13905 x22: 0000000000000010 x21: 0000000000000083<br /> x20: 0000000000000001 x19: 0000000000000008 x18: 0000000000000010<br /> x17: 0000000000000001 x16: 00000007c7f20fec x15: 0000000000000020<br /> x14: 0000000000000008 x13: 0000000000081020 x12: 0000000000000008<br /> x11: ffff800080e13905 x10: ffff800080e13988 x9 : 0000000000000000<br /> x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000020<br /> x5 : 0000000000000030 x4 : 00000000fffffffe x3 : 0000000000000000<br /> x2 : ffffac9aba78c1c8 x1 : ffffac9aba76d0a8 x0 : 0000000000000008<br /> Call trace:<br /> hex_dump_to_buffer+0x30c/0x4a0 (P)<br /> print_hex_dump+0xac/0x170<br /> cper_estatus_print_section+0x90c/0x968<br /> cper_estatus_print+0xf0/0x158<br /> __ghes_print_estatus+0xa0/0x148<br /> ghes_proc+0x1bc/0x220<br /> ghes_notify_hed+0x5c/0xb8<br /> notifier_call_chain+0x78/0x148<br /> blocking_notifier_call_chain+0x4c/0x80<br /> acpi_hed_notify+0x28/0x40<br /> acpi_ev_notify_dispatch+0x50/0x80<br /> acpi_os_execute_deferred+0x24/0x48<br /> process_one_work+0x15c/0x3b0<br /> worker_thread+0x2d0/0x400<br /> kthread+0x148/0x228<br /> ret_from_fork+0x10/0x20<br /> Code: 6b14033f 540001ad a94707e2 f100029f (b8747b44)<br /> ---[ end trace 0000000000000000 ]---<br /> <br /> Prevent that by taking the actual allocated are into account when<br /> checking for CPER length.<br /> <br /> [ rjw: Subject tweaks ]