libceph: Fix multiplication overflow in decode_new_up_state_weight()
Key facts
- Attack vector
- Network
- Privileges required
- None
- 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-190 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix multiplication overflow in decode_new_up_state_weight() If a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted osdmap, out-of-bounds memory accesses may occur in decode_new_up_state_weight(). This happens because the bounds check for the new_state part is based on calculating its length depending on a len value read from the incoming message. This calculation may overflow leading to an incorrect bounds check. Subsequently, out-of-bounds reads may occur when decoding this part. This patch switches the multiplication to use check_mul_overflow() to abort processing the osdmap if an overflow occurred. Therefore, osdmaps/messages containing large values for len that result in a multiplication overflow are treated as invalid. [ idryomov: rename new_state_len -> new_state_item_size, formatting ]
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
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 | 3.10.103 to before 3.11; 3.12.63 to before 3.13; 3.14.75 to before 3.15; 3.16.39 to before 3.17; 3.18.39 to before 3.19; 4.1.30 to before 4.2; 4.4.17 to before 4.5; 4.6.6 to before 4.7 | 3.11, 3.13, 3.15, 3.17, 3.19, 4.2, 4.5, 4.7 | Patch available | CNA |
| Linux | Linux | 4.7 and later | 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 3.10.103 to before 3.11; 3.12.63 to before 3.13; 3.14.75 to before 3.15; 3.16.39 to before 3.17; 3.18.39 to before 3.19; 4.1.30 to before 4.2; 4.4.17 to before 4.5; 4.6.6 to before 4.7 Fixed in 3.11, 3.13, 3.15, 3.17, 3.19, 4.2, 4.5, 4.7 Patch available CNA
- Linux VendorLinux Affected 4.7 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 3.11, 3.13, 3.15, 3.17, 3.19, 4.2, 4.5, 4.7
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
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 |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-68158
- 2026-10-03 Alias added: GHSA-jg8v-h49p-mvhw
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-20 Weakness changed · CISA ADP
- 2026-10-31 CVSS score changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/2ceee3b77b83052648c40fef965f836fd7699d26
- https://git.kernel.org/stable/c/e4473751cc37db41f3f7da25d64a23e0c74570f1
- https://git.kernel.org/stable/c/f6961070c326bd158c38fa48756cde2bd78c4aaa
- https://git.kernel.org/stable/c/05c90e059269f087becfcce23348496085835c29
- https://git.kernel.org/stable/c/143ba49ead77ec483c0326f8aaad8649874e99c4
- https://git.kernel.org/stable/c/1732d89dfcd74f6fde9ce70900d316c4a151c153
- https://git.kernel.org/stable/c/bee4b5b53e7bff0467fd916cc44c9b190733c6bd
- https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c
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Sources
- CVE-2026-68158 · CVE Program
- CVE-2026-68158 · NVD
- FIRST EPSS
- GHSA-jg8v-h49p-mvhw · GitHub Advisory Database · CC BY 4.0
- CVE-2026-68158 · Red Hat security data · CC BY 4.0
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