AZL-49313
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-49313.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-49313
- Upstream
- Published
- 2024-07-30T08:15:05Z
- Modified
- 2026-04-01T05:16:10.554520Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- CVE-2024-42136 affecting package kernel 5.15.200.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
cdrom: rearrange lastmediachange 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 SGIO [ 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] dumpstacklvl+0x93/0xd0 [ 366.027899] handleoverflow+0x171/0x1b0 [ 366.038787] ata1.00: invalid multicount 32 ignored [ 366.043924] cdromioctl+0x2c3f/0x2d10 [ 366.063932] ? __pmruntimeresume+0xe6/0x130 [ 366.071923] srblockioctl+0x15d/0x1d0 [ 366.074624] ? __pfxsrblockioctl+0x10/0x10 [ 366.077642] blkdevioctl+0x419/0x500 [ 366.080231] ? __pfxblkdevioctl+0x10/0x10 ...
Historically, the signed integer overflow sanitizer did not work in the kernel due to its interaction with
-fwrapvbut 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.
- References