Debian: CVE-2024-42136: linux, linux-6.1 -- security update

Debian: CVE-2024-42136: linux, linux-6.1 -- security update

Severity

7

CVSS

(AV:L/AC:L/Au:S/C:C/I:C/A:C)

Published

07/30/2024

Created

08/08/2024

Added

08/07/2024

Modified

01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: cdrom: rearrange last_media_change check to avoid unintentional overflow When running syzkaller with the newly reintroduced signed integer wrap sanitizer we encounter this splat: [366.015950] UBSAN: signed-integer-overflow in ../drivers/cdrom/cdrom.c:2361:33 [366.021089] -9223372036854775808 - 346321 cannot be represented in type '__s64' (aka 'long long') [366.025894] program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO [366.027502] CPU: 5 PID: 28472 Comm: syz-executor.7 Not tainted 6.8.0-rc2-00035-gb3ef86b5a957 #1 [366.027512] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [366.027518] Call Trace: [366.027523]<TASK> [366.027533]dump_stack_lvl+0x93/0xd0 [366.027899]handle_overflow+0x171/0x1b0 [366.038787] ata1.00: invalid multi_count 32 ignored [366.043924]cdrom_ioctl+0x2c3f/0x2d10 [366.063932]? __pm_runtime_resume+0xe6/0x130 [366.071923]sr_block_ioctl+0x15d/0x1d0 [366.074624]? __pfx_sr_block_ioctl+0x10/0x10 [366.077642]blkdev_ioctl+0x419/0x500 [366.080231]? __pfx_blkdev_ioctl+0x10/0x10 ... Historically, the signed integer overflow sanitizer did not work in the kernel due to its interaction with `-fwrapv` but this has since been changed [1] in the newest version of Clang. It was re-enabled in the kernel with Commit 557f8c582a9ba8ab ("ubsan: Reintroduce signed overflow sanitizer"). Let's rearrange the check to not perform any arithmetic, thus not tripping the sanitizer.

Solution(s)

• debian-upgrade-linux
• debian-upgrade-linux-6-1

References

• https://attackerkb.com/topics/cve-2024-42136
• CVE - 2024-42136
• DLA-4008-1