CVE-2024-26878: quota: Fix potential NULL pointer dereference
Vulnerability summary
CVE-2024-26878 is a medium (CVSS 4.7) vulnerability in debian debian_linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.6% of scored vulnerabilities.
Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 38 · Related 31Timeline
- 17-04-2024PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: quota: Fix potential NULL pointer dereference Below race may cause NULL pointer dereference P1 P2 dquot_free_inode quota_off drop_dquot_ref remove_dquot_ref dquots = i_dquot(inode) dquots = i_dquot(inode) srcu_read_lock dquots[cnt]) != NULL (1) dquots[type] = NULL (2) spin_lock(&dquots[cnt]->dq_dqb_lock) (3) .... If dquot_free_inode(or other routines) checks inode's quota pointers (1) before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer dereference will be triggered. So let's fix it by using a temporary pointer to avoid this issue.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
9%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.19% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
- CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu118 products
- linuxAll versions (No fix recorded) | < 5.4.0-189.209 | < 5.15.0-112.122 | < 6.8.0-35.35
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.4.0-1128.138 | < 5.15.0-1063.69 | < 6.8.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.85-1 | < 6.7.12-1
- debian_linuxEOL10.0
Linux2 products
- linux≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 8514899c1a4edf802f03c408db901063aa3f05a1 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 49669f8e7eb053f91d239df7b1bfb4500255a9d0 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 61380537aa6dd32d8a723d98b8f1bd1b11d8fee0 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 7f9e833fc0f9b47be503af012eb5903086939754 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < f2649d98aa9ca8623149b3cb8df00c944f5655c7 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < 6afc9f4434fa8063aa768c2bf5bf98583aee0877 | ≥ 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac, < d0aa72604fbd80c8aabb46eda00535ed35570f1f | 4.14
- linux_kernel< 4.19.311 | ≥ 4.20, < 5.4.273 | ≥ 5.5, < 5.10.214 | ≥ 5.11, < 5.15.153 | ≥ 5.16, < 6.1.83 | ≥ 6.2, < 6.6.23 | ≥ 6.7, < 6.7.11 | ≥ 6.8, < 6.8.2
3 vendors · 122 products
