5.5

CVE-2024-49933: blk_iocost: fix more out of bound shifts

Modified
AliasesUBUNTU-CVE-2024-49933DEBIAN-CVE-2024-49933
Published 21-10-2024Last modified 11-05-2026

Vulnerability summary

CVE-2024-49933 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 38 · Related 35
DLA-4008-1DLA-4075-1MGASA-2024-0344MGASA-2024-0345OPENSUSE-SU-2024:14500-1OPENSUSE-SU-2025:14705-1

Timeline

  1. 21-10-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu122 products
  • linux< 5.15.0-127.137 | < 6.8.0-54.56
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1073.79 | < 6.8.0-1023.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ bec02dbbafad534674309f8b948094900f456797, < 1f61d509257d6a05763d05bf37943b35306522b1 | ≥ bec02dbbafad534674309f8b948094900f456797, < f4ef9bef023d5c543cb0f3194ecacfd47ef590ec | ≥ bec02dbbafad534674309f8b948094900f456797, < 59121bb38fdc01434ea3fe361ee02b59f036227f | ≥ bec02dbbafad534674309f8b948094900f456797, < 1ab2cfe19700fb3dde4c7dfec392acff34db3120 | ≥ bec02dbbafad534674309f8b948094900f456797, < 1b120f151871eb47ce9f283c007af3f8ae1d990e | ≥ bec02dbbafad534674309f8b948094900f456797, < 364022095bdd4108efdaaa68576afa4712a5d085 | ≥ bec02dbbafad534674309f8b948094900f456797, < 9bce8005ec0dcb23a58300e8522fe4a31da606fa | 5.10
  • linux_kernel< 5.10.227 | ≥ 5.11, < 5.15.168 | ≥ 5.16, < 6.1.113 | ≥ 6.2, < 6.6.55 | ≥ 6.7, < 6.10.14 | ≥ 6.11, < 6.11.3
Debian1 product
  • linux< 6.1.115-1 | < 6.11.4-1

3 vendors · 125 products

References

36 links
Show all 36 references