CVE-2024-56549cachefiles: Fix NULL pointer dereference in object->file
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from c8383054506c77b814489c09877b5db83fd4abf2 before d6bba3ece960129a553d4b16f1b00c884dc0993a; from c8383054506c77b814489c09877b5db83fd4abf2 before 785408bbafcfa24c9fc5b251f03fd0780ce182bd; from c8383054506c77b814489c09877b5db83fd4abf2 before f98770440c9bc468e2fd878212ec9526dbe08293; from c8383054506c77b814489c09877b5db83fd4abf2 before 9582c7664103c9043e80a78f5c382aa6bdd67418; from c8383054506c77b814489c09877b5db83fd4abf2 before 31ad74b20227ce6b40910ff78b1c604e42975cf1 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.19 before 6.11.11; from 6.12 before 6.12.2 | NVD |
References
- https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a
- https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd
- https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293patch
- https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418patch
- https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.