CVE-2022-49762

Summary

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

ntfs: check overflow when iterating ATTR_RECORDs

Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). Because the ATTR_RECORDs are next to each other, kernel can get the next ATTR_RECORD from end address of current ATTR_RECORD, through current ATTR_RECORD length field.

The problem is that during iteration, when kernel calculates the end address of current ATTR_RECORD, kernel may trigger an integer overflow bug in executing a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length)). This may wrap, leading to a forever iteration on 32bit systems.

This patch solves it by adding some checks on calculating end address of current ATTR_RECORD during iteration.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5559eb5809353a83a40a1e4e7f066431c7b83020affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 86f36de14dce5802856bb7a5921d74439db00b64affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45683723f6b53e39e8a4cec0894e61fd6ec71989affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b612f924f296408d7d02fb4cd01218afd4ed7184affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 957732a09c3828267c2819d31c425aa793dd475baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b63ddb3ba61e2d3539f87e095c881e552bc45dabaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 785b2af9654b8beac55644e36da0085c5d776361affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 63095f4f3af59322bea984a6ae44337439348fe0affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux4.9.334 <= 4.9.*unaffected
LinuxLinux4.14.300 <= 4.14.*unaffected
LinuxLinux4.19.267 <= 4.19.*unaffected
LinuxLinux5.4.225 <= 5.4.*unaffected
LinuxLinux5.10.156 <= 5.10.*unaffected
LinuxLinux5.15.80 <= 5.15.*unaffected
LinuxLinux6.0.10 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

References