5.5

CVE-2024-39276: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2024-39276DEBIAN-CVE-2024-39276
Published 25-06-2024Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2024-39276 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.23%
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 34 · Related 27
DSA-5730-1MGASA-2024-0263MGASA-2024-0266RHSA-2024:5101RHSA-2024:5102RHSA-2024:9315

Timeline

  1. 25-06-2024
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

0.00 pp

From 0.23% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.23%

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

No weakness data has been published for this record.

Affected systems

Ubuntu127 products
  • linuxAll versions (No fix recorded) | < 5.4.0-192.212 | < 5.15.0-121.131 | < 6.8.0-44.44
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1130.140 | < 5.15.0-1069.75 | < 6.8.0-1015.16
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ b878c8a7f08f0c225b6a46ba1ac867e9c5d17807, < 9ad75e78747b5a50dc5a52f0f8e92e920a653f16 | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < 896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < 76dc776153a47372719d664e0fc50d6355791abb | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < 681ff9a09accd8a4379f8bd30b7a1641ee19bb3e | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < e941b712e758f615d311946bf98216e79145ccd9 | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < a95df6f04f2c37291adf26a74205cde0314d4577 | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < b37c0edef4e66fb21a2fbc211471195a383e5ab8 | ≥ fb265c9cb49e2074ddcdd4de99728aefdd3b3592, < 0c0b4a49d3e7f49690a6827a41faeffad5df7e21 | 9da1f6d06b7a6d068e68fcfd7cbbf6b586d888e1 | 81313ed2c705d958744882a269bf4a5e3ddec95e | ≥ 4.19.14, < 4.19.316 | ≥ 4.14.92, < 4.15 | ≥ 4.20.1, < 4.21 | 5.0
  • linux_kernel≥ 4.14.92, < 4.15 | ≥ 4.19.14, < 4.19.316 | ≥ 4.20.1, ≤ 5.4.278 | ≥ 5.5, ≤ 5.15.161 | ≥ 5.16, ≤ 6.1.94 | ≥ 6.2, ≤ 6.6.34 | ≥ 6.7, ≤ 6.9.5
Debian1 product
  • linux< 6.1.94-1 | < 6.9.7-1

3 vendors · 130 products

References

31 links
Show all 31 references