CVE - CVE-2024-49933

CVE-ID
CVE-2024-49933	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1ab2cfe19700fb3dde4c7dfec392acff34db3120 URL:https://git.kernel.org/stable/c/1ab2cfe19700fb3dde4c7dfec392acff34db3120 MISC:https://git.kernel.org/stable/c/1b120f151871eb47ce9f283c007af3f8ae1d990e URL:https://git.kernel.org/stable/c/1b120f151871eb47ce9f283c007af3f8ae1d990e MISC:https://git.kernel.org/stable/c/1f61d509257d6a05763d05bf37943b35306522b1 URL:https://git.kernel.org/stable/c/1f61d509257d6a05763d05bf37943b35306522b1 MISC:https://git.kernel.org/stable/c/364022095bdd4108efdaaa68576afa4712a5d085 URL:https://git.kernel.org/stable/c/364022095bdd4108efdaaa68576afa4712a5d085 MISC:https://git.kernel.org/stable/c/59121bb38fdc01434ea3fe361ee02b59f036227f URL:https://git.kernel.org/stable/c/59121bb38fdc01434ea3fe361ee02b59f036227f MISC:https://git.kernel.org/stable/c/9bce8005ec0dcb23a58300e8522fe4a31da606fa URL:https://git.kernel.org/stable/c/9bce8005ec0dcb23a58300e8522fe4a31da606fa MISC:https://git.kernel.org/stable/c/f4ef9bef023d5c543cb0f3194ecacfd47ef590ec URL:https://git.kernel.org/stable/c/f4ef9bef023d5c543cb0f3194ecacfd47ef590ec
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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