{"id":"CVE-2026-31447","title":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: reject mount if bigalloc with s_first_data_block != 0\n\nbigalloc with s_first_data_block != 0 is not supported, reject mounting\nit.","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: reject mount if bigalloc with s_first_data_block != 0\n\nbigalloc with s_first_data_block != 0 is not supported, reject mounting\nit.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.2, < 5.10.253","linux_kernel >= 5.11, < 5.15.203","linux_kernel >= 5.16, < 6.1.168","linux_kernel >= 6.2, < 6.6.131","linux_kernel >= 6.7, < 6.12.80","linux_kernel >= 6.13, < 6.18.21","linux_kernel >= 6.19, < 6.19.11","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.11"],"published":"2026-04-22","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:05.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31447","references":[{"url":"https://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00143,"epssPercentile":0.03578,"ingestedAt":"2026-09-08T15:33:26.990Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:09:23.320699Z"},"slug":"CVE-2026-31447","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\next4: reject mount if bigalloc with s_first_data_block != 0\n\nbigalloc with s_first_data_block != 0 is not supported, reject mounting\nit.\n\n## Affected\n\n- `linux_kernel >= 3.2, < 5.10.253`\n- `linux_kernel >= 5.11, < 5.15.203`\n- `linux_kernel >= 5.16, < 6.1.168`\n- `linux_kernel >= 6.2, < 6.6.131`\n- `linux_kernel >= 6.7, < 6.12.80`\n- `linux_kernel >= 6.13, < 6.18.21`\n- `linux_kernel >= 6.19, < 6.19.11`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.11`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}