nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [[email protected]: NOTE added to the commit log]
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.30 and later | 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, 6.1.56, 6.5.6, 6.6 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.30 and later Fixed in 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, 6.1.56, 6.5.6, 6.6 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 2.6.30 to before 4.14.327; 4.15 to before 4.19.296; 4.20 to before 5.4.258; 5.5 to before 5.10.198; 5.11 to before 5.15.134; 5.16 to before 6.1.56; 6.2 to before 6.5.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:* | 6.6 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:* | 6.6 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:* | 6.6 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.30 to before 4.14.327; 4.15 to before 4.19.296; 4.20 to before 5.4.258; 5.5 to before 5.10.198; 5.11 to before 5.15.134; 5.16 to before 6.1.56; 6.2 to before 6.5.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:* Versions 6.6 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:* Versions 6.6 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:* Versions 6.6 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, 6.1.56, 6.5.6, 6.6
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2023-52566
- 2026-10-03 Alias added: GHSA-4c64-w6qg-97qw
References
Patch 8
- https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1
- https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5b
- https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33
- https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7
- https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8
- https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8c
- https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2
- https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc
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Sources
- CVE-2023-52566 · CVE Program
- CVE-2023-52566 · NVD
- FIRST EPSS
- GHSA-4c64-w6qg-97qw · GitHub Advisory Database · CC BY 4.0
- CVE-2023-52566 · Red Hat security data · CC BY 4.0
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