{"id":"CVE-2026-98636","published":"2026-10-18T16:17:16.700","lastModified":"2026-10-19T10:19:27.837","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsquashfs: Add dictionary size range check to prevent shift-out-of-bounds\n\nWhen an abnormal SquashFS image (COMP_OPTS flag is 1 but dictionary size\nis 0) is mounted, and performs shift operations using dictionarysize, the\nshift exponent is -1, causing a shift-out-of-bounds.\n\nDetail as below:\nsquashfs_comp_opts(msblk, buffer, length)\n  squashfs_xz_comp_opts()\n    if (comp_opts)\n      n = ffs(opts->dict_size) - 1;<----opts->dict_size=0, n=-1\n      if (opts->dict_size != (1 << n) && opts->dict_size !=\n\t  \t(1 << n) + (1 << (n + 1))) <----shift-out-of-bounds\n\nFix it by adding a dictionary size range check before the shift operation.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","tags":[]},{"url":"https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0","tags":[]},{"url":"https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","tags":[]},{"url":"https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a","tags":[]},{"url":"https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1","tags":[]},{"url":"https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea","tags":[]},{"url":"https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089","tags":[]},{"url":"https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}