CVE-2024-49933

blk_iocost: fix more out of bound shifts

State: Published
Severity: Not scored
Published: Oct 21, 2024
Updated: May 11, 2026
Reserved: Oct 21, 2024

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	bec02dbbafad534674309f8b948094900f456797 to before 1f61d509257d6a05763d05bf37943b35306522b1Affected bec02dbbafad534674309f8b948094900f456797 to before f4ef9bef023d5c543cb0f3194ecacfd47ef590ecAffected bec02dbbafad534674309f8b948094900f456797 to before 59121bb38fdc01434ea3fe361ee02b59f036227fAffected bec02dbbafad534674309f8b948094900f456797 to before 1ab2cfe19700fb3dde4c7dfec392acff34db3120Affected bec02dbbafad534674309f8b948094900f456797 to before 1b120f151871eb47ce9f283c007af3f8ae1d990eAffected bec02dbbafad534674309f8b948094900f456797 to before 364022095bdd4108efdaaa68576afa4712a5d085Affected bec02dbbafad534674309f8b948094900f456797 to before 9bce8005ec0dcb23a58300e8522fe4a31da606faAffected
LinuxLinux	5.10Affected before 5.10Not affected 5.10.227 through 5.10.Not affected 5.15.168 through 5.15.Not affected 6.1.113 through 6.1.Not affected 6.6.55 through 6.6.Not affected 6.10.14 through 6.10.Not affected 6.11.3 through 6.11.Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

bec02dbbafad534674309f8b948094900f456797 to before 1f61d509257d6a05763d05bf37943b35306522b1Affected
bec02dbbafad534674309f8b948094900f456797 to before f4ef9bef023d5c543cb0f3194ecacfd47ef590ecAffected
bec02dbbafad534674309f8b948094900f456797 to before 59121bb38fdc01434ea3fe361ee02b59f036227fAffected
bec02dbbafad534674309f8b948094900f456797 to before 1ab2cfe19700fb3dde4c7dfec392acff34db3120Affected
bec02dbbafad534674309f8b948094900f456797 to before 1b120f151871eb47ce9f283c007af3f8ae1d990eAffected
bec02dbbafad534674309f8b948094900f456797 to before 364022095bdd4108efdaaa68576afa4712a5d085Affected
bec02dbbafad534674309f8b948094900f456797 to before 9bce8005ec0dcb23a58300e8522fe4a31da606faAffected

LinuxLinux

5.10Affected
before 5.10Not affected
5.10.227 through 5.10.*Not affected
5.15.168 through 5.15.*Not affected
6.1.113 through 6.1.*Not affected
6.6.55 through 6.6.*Not affected
6.10.14 through 6.10.*Not affected
6.11.3 through 6.11.*Not affected
6.12 and laterNot affected

References

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