CVE-2025-39879 — NULL Pointer Dereference in Linux

CWE-476 — NULL Pointer Dereference5 documents5 sources
Severity
5.5MEDIUMNVD
EPSS
0.0%
top 94.52%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedSep 23

Description

In the Linux kernel, the following vulnerability has been resolved: ceph: always call ceph_shift_unused_folios_left() The function ceph_process_folio_batch() sets folio_batch entries to NULL, which is an illegal state. Before folio_batch_release() crashes due to this API violation, the function ceph_shift_unused_folios_left() is supposed to remove those NULLs from the array. However, since commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method"), this shifting doesn't happen …

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages4 packages

▶NVDlinux/linux_kernel6.15 — 6.16.8+1
▶Debianlinux/linux_kernel< 6.16.8-1
▶CVEListV5linux/linuxce80b76dd32764cc914975777e058d4fae4f0ea0 — 289b6615cf553d98509a9b273195d9936da1cfb2+2
▶debiandebian/linux< linux 6.16.8-1 (forky)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-hq23-ggcp-mx5x: In the Linux kernel, the following vulnerability has been resolved: ceph: always call ceph_shift_unused_folios_left() The function ceph_process_foli↗2025-09-23
▶
OSV
CVE-2025-39879: In the Linux kernel, the following vulnerability has been resolved: ceph: always call ceph_shift_unused_folios_left() The function ceph_process_folio_↗2025-09-23
▶

📋Vendor Advisories

2
Red Hat
kernel: ceph: always call ceph_shift_unused_folios_left()↗2025-09-23
▶
Debian
CVE-2025-39879: linux - In the Linux kernel, the following vulnerability has been resolved: ceph: alway...↗2025
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CVE-2025-39879 — NULL Pointer Dereference in Linux | cvebase