CVE-2026-31447 PUBLISHED

ext4: reject mount if bigalloc with s_first_data_block != 0

Assigner: Linux
Reserved: 09.03.2026 Published: 22.04.2026 Updated: 22.04.2026

In the Linux kernel, the following vulnerability has been resolved:

ext4: reject mount if bigalloc with s_first_data_block != 0

bigalloc with s_first_data_block != 0 is not supported, reject mounting it.

Vendor	Linux
Product	Linux
Versions	Default: unaffected affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 5ad6d994255e27a3254079dfb50ca861fc31f2d0 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 3a926957cc95899ef88529710836edadc03c71a1 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 7b58c110b4e1f028eb38eec9ed3555e9be81c8b0 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to b77de3fceafbb39f30e4ff5dc986f863d5456417 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to d787d3ae96648dc14a3b7ca8fde817177e82c1c7 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to ad1f6d608f33f59d21a3d025615d6786a6443998 (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 7d5b04290156c3fc316eecc86a4f9d201ab7d44a (excl.) affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 3822743dc20386d9897e999dbb990befa3a5b3f8 (excl.)

Vendor	Linux
Product	Linux
Versions	Default: affected unaffected from 5.10.253 to 5.10.* (incl.) unaffected from 5.15.203 to 5.15.* (incl.) unaffected from 6.1.168 to 6.1.* (incl.) unaffected from 6.6.131 to 6.6.* (incl.) unaffected from 6.12.80 to 6.12.* (incl.) unaffected from 6.18.21 to 6.18.* (incl.) unaffected from 6.19.11 to 6.19.* (incl.) unaffected from 7.0 to * (incl.)