9.8

CVE-2024-49855: nbd: fix race between timeout and normal completion

Modified
AliasesUBUNTU-CVE-2024-49855DEBIAN-CVE-2024-49855
Published 21-10-2024Last modified 05-08-2026

Vulnerability summary

CVE-2024-49855 is a critical (CVSS 9.8) Use After Free vulnerability in linux. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 40.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.46%
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 41 · Related 40
DLA-4008-1MGASA-2024-0344MGASA-2024-0345OPENSUSE-SU-2024:14500-1OPENSUSE-SU-2025:14705-1SUSE-SU-2024:3984-1

Timeline

  1. 21-10-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between timeout and normal completion If request timetout is handled by nbd_requeue_cmd(), normal completion has to be stopped for avoiding to complete this requeued request, other use-after-free can be triggered. Fix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime make sure that cmd->lock is grabbed for clearing the flag and the requeue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.46% 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

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu131 products
  • linuxAll versions (No fix recorded) | < 6.8.0-54.56
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1023.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2895f1831e911ca87d4efdf43e35eb72a0c7e66e, < 9c25faf72d780a9c71081710cd48759d61ff6e9b | ≥ 2895f1831e911ca87d4efdf43e35eb72a0c7e66e, < 6e73b946a379a1dfbb62626af93843bdfb53753d | ≥ 2895f1831e911ca87d4efdf43e35eb72a0c7e66e, < 5236ada8ebbd9e7461f17477357582f5be4f46f7 | ≥ 2895f1831e911ca87d4efdf43e35eb72a0c7e66e, < 9a74c3e6c0d686c26ba2aab66d15ddb89dc139cc | ≥ 2895f1831e911ca87d4efdf43e35eb72a0c7e66e, < c9ea57c91f03bcad415e1a20113bdb2077bcf990 | cdf62c535a9bfd5ff0eef4b91669da39d8abc0c3 | 5171ef20bae852ff38f4cfdb368bcdcc744776d0 | ≥ 5.17.15, < 5.18 | ≥ 5.18.4, < 5.19 | 5.19
  • linux_kernelEOL≥ 5.18.4, < 5.19 | ≥ 5.19, < 6.1.113 | ≥ 6.2, < 6.6.54 | ≥ 6.7, < 6.10.13 | ≥ 6.11, < 6.11.2 | 5.17.15
Debian1 product
  • linux< 6.1.115-1 | < 6.11.2-1

3 vendors · 134 products

References

26 links
Show all 26 references