libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · 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-476.
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply() If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL. This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | 5.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.34 and later Fixed in 5.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 2.6.34.1 to before 5.15.209; 5.16 to before 6.1.175; 6.2 to before 6.6.140; 6.7 to before 6.12.86; 6.13 to before 6.18.27; 6.19 to before 7.0.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:* | 2.6.34 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc2:*:*:*:*:*:* | 2.6.34 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc3:*:*:*:*:*:* | 2.6.34 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc4:*:*:*:*:*:* | 2.6.34 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc5:*:*:*:*:*:* | 2.6.34 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc6:*:*:*:*:*:* | 2.6.34 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.34:rc7:*:*:*:*:*:* | 2.6.34 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.34.1 to before 5.15.209; 5.16 to before 6.1.175; 6.2 to before 6.6.140; 6.7 to before 6.12.86; 6.13 to before 6.18.27; 6.19 to before 7.0.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:* Versions 2.6.34 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc2:*:*:*:*:*:* Versions 2.6.34 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc3:*:*:*:*:*:* Versions 2.6.34 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc4:*:*:*:*:*:* Versions 2.6.34 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc5:*:*:*:*:*:* Versions 2.6.34 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc6:*:*:*:*:*:* Versions 2.6.34 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.34:rc7:*:*:*:*:*:* Versions 2.6.34 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-46024
- 2026-10-03 Alias added: GHSA-fmw3-m5fg-w74x
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
- 2026-10-19 Weakness changed · CISA ADP
- 2026-10-25 EPSS moved to the below the 50th percentile
- 2026-10-25 Priority changed: MEDIUM → LOW
References
Patch 7
- https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df
- https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118
- https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d
- https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548
- https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77
- https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e
- https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e
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Sources
- CVE-2026-46024 · CVE Program
- CVE-2026-46024 · NVD
- FIRST EPSS
- GHSA-fmw3-m5fg-w74x · GitHub Advisory Database · CC BY 4.0
- CVE-2026-46024 · Red Hat security data · CC BY 4.0
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