CVE-2024-56549cachefiles: Fix NULL pointer dereference in object->file
- 7.8HighCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 22 months later
· 22 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected c8383054506c77b814489c09877b5db83fd4abf2 – < d6bba3ece960129a553d4b16f1b00c884dc0993a
- affected c8383054506c77b814489c09877b5db83fd4abf2 – < 785408bbafcfa24c9fc5b251f03fd0780ce182bd
- affected c8383054506c77b814489c09877b5db83fd4abf2 – < f98770440c9bc468e2fd878212ec9526dbe08293
- affected c8383054506c77b814489c09877b5db83fd4abf2 – < 9582c7664103c9043e80a78f5c382aa6bdd67418
- affected c8383054506c77b814489c09877b5db83fd4abf2 – < 31ad74b20227ce6b40910ff78b1c604e42975cf1
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.129 – ≤ 6.1.*
- unaffected 6.6.78 – ≤ 6.6.*
- unaffected 6.11.11 – ≤ 6.11.*
- unaffected 6.12.2 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References6
- https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a (opens in a new tab)
- https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd (opens in a new tab)
- https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293 (opens in a new tab)
- https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418 (opens in a new tab)
- https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-53197 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-56549)Record last updated .