cve-2024-26712
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2024-11-05 15:47
Severity ?
4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Summary
powerpc/kasan: Fix addr error caused by page alignment
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26712\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T15:15:53.590\",\"lastModified\":\"2024-11-05T16:35:14.353\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/kasan: Fix addr error caused by page alignment\\n\\nIn kasan_init_region, when k_start is not page aligned, at the begin of\\nfor loop, k_cur = k_start \u0026 PAGE_MASK is less than k_start, and then\\n`va = block + k_cur - k_start` is less than block, the addr va is invalid,\\nbecause the memory address space from va to block is not alloced by\\nmemblock_alloc, which will not be reserved by memblock_reserve later, it\\nwill be used by other places.\\n\\nAs a result, memory overwriting occurs.\\n\\nfor example:\\nint __init __weak kasan_init_region(void *start, size_t size)\\n{\\n[...]\\n\\t/* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */\\n\\tblock = memblock_alloc(k_end - k_start, PAGE_SIZE);\\n\\t[...]\\n\\tfor (k_cur = k_start \u0026 PAGE_MASK; k_cur \u003c k_end; k_cur += PAGE_SIZE) {\\n\\t\\t/* at the begin of for loop\\n\\t\\t * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400)\\n\\t\\t * va(dcd96c00) is less than block(dcd97000), va is invalid\\n\\t\\t */\\n\\t\\tvoid *va = block + k_cur - k_start;\\n\\t\\t[...]\\n\\t}\\n[...]\\n}\\n\\nTherefore, page alignment is performed on k_start before\\nmemblock_alloc() to ensure the validity of the VA address.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: powerpc/kasan: corrige el error de direcci\u00f3n causado por la alineaci\u00f3n de la p\u00e1gina En kasan_init_region, cuando k_start no est\u00e1 alineado con la p\u00e1gina, al comienzo del bucle for, k_cur = k_start y PAGE_MASK es menor que k_start. y luego `va = block + k_cur - k_start` es menor que block, la direcci\u00f3n va no es v\u00e1lida, porque memblock_alloc no asigna el espacio de direcciones de memoria de va al bloque, que no ser\u00e1 reservado por memblock_reserve m\u00e1s adelante, se utilizar\u00e1 por otros lugares. Como resultado, se produce una sobrescritura de la memoria. por ejemplo: int __init __weak kasan_init_region(void *start, size_t size) { [...] /* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */ block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start \u0026amp; PAGE_MASK; k_cur \u0026lt; k_end; k_cur += PAGE_SIZE) { /* al comienzo del bucle for * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va (dcd96c00) es menor que block(dcd97000), va no es v\u00e1lido */ void *va = block + k_cur - k_start; [...] } [...] } Por lo tanto, la alineaci\u00f3n de la p\u00e1gina se realiza en k_start antes de memblock_alloc() para garantizar la validez de la direcci\u00f3n VA.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":0.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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