ceph: prevent use-after-free in encode_cap_msg()
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
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 | 2.6.34 and later | 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.34 and later Fixed in 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 5.10.210; 5.11 to before 5.15.149; 5.16 to before 6.1.79; 6.2 to before 6.6.18; 6.7 to before 6.7.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* | 6.8 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* | 6.8 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:* | 6.8 rc3 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.10.210; 5.11 to before 5.15.149; 5.16 to before 6.1.79; 6.2 to before 6.6.18; 6.7 to before 6.7.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* Versions 6.8 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* Versions 6.8 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:* Versions 6.8 rc3 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2024-26689
- 2026-10-03 Alias added: GHSA-9xp8-8c5r-6wfh
References
Patch 6
- https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214
- https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77
- https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139
- https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7
- https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc
- https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef
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Sources
- CVE-2024-26689 · CVE Program
- CVE-2024-26689 · NVD
- FIRST EPSS
- GHSA-9xp8-8c5r-6wfh · GitHub Advisory Database · CC BY 4.0
- CVE-2024-26689 · Red Hat security data · CC BY 4.0
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