CVE-2025-37949
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
xenbus: Use kref to track req lifetime
In the Linux kernel, the following vulnerability has been resolved: xenbus: Use kref to track req lifetime Marek reported seeing a NULL pointer fault in the xenbus_thread callstack: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Call Trace: <TASK> __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e is req->cb(req). req->cb is set to xs_wake_up(), a thin wrapper around wake_up(), or xenbus_dev_queue_reply(). It seems like it was xs_wake_up() in this case. It seems like req may have woken up the xs_wait_for_reply(), which kfree()ed the req. When xenbus_thread resumes, it faults on the zero-ed data. Linux Device Drivers 2nd edition states: "Normally, a wake_up call can cause an immediate reschedule to happen, meaning that other processes might run before wake_up returns." ... which would match the behaviour observed. Change to keeping two krefs on each request. One for the caller, and one for xenbus_thread. Each will kref_put() when finished, and the last will free it. This use of kref matches the description in Documentation/core-api/kref.rst
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 0e94a246bb6d9538010b6c02d2b1d4717a97b2e5 | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | f1bcac367bc95631afbb918348f30dec887d0e1b | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 4d260a5558df4650eb87bc41b2c9ac2d6b2ba447 | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 8b02f85e84dc6f7c150cef40ddb69af5a25659e5 | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | cbfaf46b88a4c01b64c4186cdccd766c19ae644c | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 8e9c8a0393b5f85f1820c565ab8105660f4e8f92 | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 2466b0f66795c3c426cacc8998499f38031dbb59 | Unavailable | None listed |
| fd8aa9095a95c02dcc35540a263267c29b8fda9d | affected | git | 1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.11 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.11 | Unavailable | None listed |
| 5.4.294 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.238 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.183 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.139 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.91 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.29 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.14.7 | unaffected | semver | Unavailable | 6.14.* | None listed |
| 6.15 | unaffected | original_commit_for_fix | Unavailable | * | None listed |