CVE-2024-49933: blk_iocost: fix more out of bound shifts
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: blk_iocost: fix more out of bound shifts Recently running UBSAN caught few out of bound shifts in the ioc_forgive_debts() function: UBSAN: shift-out-of-bounds in block/blk-iocost.c:2142:38 shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long long') ... UBSAN: shift-out-of-bounds in block/blk-iocost.c:2144:30 shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long long') ... Call Trace: <IRQ> dump_stack_lvl+0xca/0x130 __ubsan_handle_shift_out_of_bounds+0x22c/0x280 ? __lock_acquire+0x6441/0x7c10 ioc_timer_fn+0x6cec/0x7750 ? blk_iocost_init+0x720/0x720 ? call_timer_fn+0x5d/0x470 call_timer_fn+0xfa/0x470 ? blk_iocost_init+0x720/0x720 __run_timer_base+0x519/0x700 ... Actual impact of this issue was not identified but I propose to fix the undefined behaviour. The proposed fix to prevent those out of bound shifts consist of precalculating exponent before using it the shift operations by taking min value from the actual exponent and maximum possible number of bits.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/1ab2cfe19700fb3dde4c7dfec392acff34db3120
- https://git.kernel.org/stable/c/1b120f151871eb47ce9f283c007af3f8ae1d990e
- https://git.kernel.org/stable/c/1f61d509257d6a05763d05bf37943b35306522b1
- https://git.kernel.org/stable/c/364022095bdd4108efdaaa68576afa4712a5d085
- https://git.kernel.org/stable/c/59121bb38fdc01434ea3fe361ee02b59f036227f
- https://git.kernel.org/stable/c/9bce8005ec0dcb23a58300e8522fe4a31da606fa
- https://git.kernel.org/stable/c/f4ef9bef023d5c543cb0f3194ecacfd47ef590ec
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49933
- https://nvd.nist.gov/vuln/detail/CVE-2024-49933
- https://launchpad.net/bugs/cve/CVE-2024-49933
- https://security-tracker.debian.org/tracker/CVE-2024-49933
- https://ubuntu.com/security/CVE-2024-49933
- https://git.kernel.org/linus/9bce8005ec0dcb23a58300e8522fe4a31da606fa
Frequently Asked Questions
What is the severity of CVE-2024-49933?
CVE-2024-49933 has a medium severity level due to its potential to cause system instability.
What versions of Linux Kernel are affected by CVE-2024-49933?
CVE-2024-49933 affects Linux Kernel versions prior to 5.10.227 and between 5.11 to 5.15.168, 5.16 to 6.1.113, 6.2 to 6.6.55, 6.7 to 6.10.14, and 6.11 to 6.11.3.
How do I fix CVE-2024-49933?
To fix CVE-2024-49933, update your Linux Kernel to a version equal to or greater than 6.12.11-1 or apply the necessary patch provided in the remediation packages.
What specific function in the Linux Kernel is vulnerable in CVE-2024-49933?
The vulnerable function in CVE-2024-49933 is ioc_forgive_debts() located in block/blk-iocost.c.
Does CVE-2024-49933 require special conditions to be exploited?
CVE-2024-49933 can be triggered during specific I/O operations, making it susceptible to exploitation under certain system workloads.
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