4.4

CVE-2024-26638: linux Use of Uninitialized Resource

CVSS: 4.4v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2024-26638DEBIAN-CVE-2024-26638
Published 18-03-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2024-26638 is a medium (CVSS 4.4) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities.

Overall risk
18/100
0100
Low · default modelHow is this calculated?
CVSS score
4.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 14
RHSA-2024:7000RHSA-2024:9315RHSA-2025:9584SUSE-SU-2024:2135-1SUSE-SU-2024:2203-1SUSE-SU-2024:2973-1

Timeline

  1. 18-03-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: nbd: always initialize struct msghdr completely syzbot complains that msg->msg_get_inq value can be uninitialized [1] struct msghdr got many new fields recently, we should always make sure their values is zero by default. [1] BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879 sock_recvmsg_nosec net/socket.c:1044 [inline] sock_recvmsg+0x12b/0x1e0 net/socket.c:1066 __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Local variable msg created at: __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 CPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: nbd5-recv recv_work

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.22% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu75 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60, < d9c54763e5cdbbd3f81868597fe8aca3c96e6387 | ≥ f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60, < 1960f2b534da1e6c65fb96f9e98bda773495f406 | ≥ f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60, < b0028f333420a65a53a63978522db680b37379dd | ≥ f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60, < 78fbb92af27d0982634116c7a31065f24d092826 | 5.19
  • linux_kernel≥ 5.19, < 6.1.76 | ≥ 6.2, < 6.6.15 | ≥ 6.7, < 6.7.3
Debian1 product
  • linux< 6.1.76-1 | < 6.6.15-1

3 vendors · 78 products

References

16 links
Show all 16 references