7.8

CVE-2024-56549: cachefiles: Fix NULL pointer dereference in object->file

Modified
AliasesUBUNTU-CVE-2024-56549DEBIAN-CVE-2024-56549
Published 27-12-2024Last modified 15-10-2026

Vulnerability summary

CVE-2024-56549 is a high (CVSS 7.8) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.23%
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 22 · Related 23
DLA-4102-1SUSE-SU-2025:0117-1SUSE-SU-2025:0153-1SUSE-SU-2025:0154-1SUSE-SU-2025:0201-1SUSE-SU-2025:0201-2

Timeline

  1. 27-12-2024
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix NULL pointer dereference in object->file At present, the object->file has the NULL pointer dereference problem in ondemand-mode. The root cause is that the allocated fd and object->file lifetime are inconsistent, and the user-space invocation to anon_fd uses object->file. Following is the process that triggers the issue: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object->file) object->file = NULL // file NULL pointer dereference! __cachefiles_write(..., file, ...) Fix this issue by add an additional reference count to the object->file before write/llseek, and decrement after it finished.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu104 products
  • linux< 6.8.0-58.60
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1027.29
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c8383054506c77b814489c09877b5db83fd4abf2, < d6bba3ece960129a553d4b16f1b00c884dc0993a | ≥ c8383054506c77b814489c09877b5db83fd4abf2, < 785408bbafcfa24c9fc5b251f03fd0780ce182bd | ≥ c8383054506c77b814489c09877b5db83fd4abf2, < f98770440c9bc468e2fd878212ec9526dbe08293 | ≥ c8383054506c77b814489c09877b5db83fd4abf2, < 9582c7664103c9043e80a78f5c382aa6bdd67418 | ≥ c8383054506c77b814489c09877b5db83fd4abf2, < 31ad74b20227ce6b40910ff78b1c604e42975cf1 | 5.19
  • linux_kernel≥ 5.19, < 6.11.11 | ≥ 6.12, < 6.12.2
Debian1 product
  • linux< 6.1.129-1 | < 6.12.3-1

3 vendors · 107 products

References

23 links
Show all 23 references