{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-37949","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.972Z","datePublished":"2025-05-20T16:01:45.242Z","dateUpdated":"2026-05-11T21:18:13.156Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:18:13.156Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxenbus: Use kref to track req lifetime\n\nMarek reported seeing a NULL pointer fault in the xenbus_thread\ncallstack:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nRIP: e030:__wake_up_common+0x4c/0x180\nCall Trace:\n <TASK>\n __wake_up_common_lock+0x82/0xd0\n process_msg+0x18e/0x2f0\n xenbus_thread+0x165/0x1c0\n\nprocess_msg+0x18e is req->cb(req).  req->cb is set to xs_wake_up(), a\nthin wrapper around wake_up(), or xenbus_dev_queue_reply().  It seems\nlike it was xs_wake_up() in this case.\n\nIt seems like req may have woken up the xs_wait_for_reply(), which\nkfree()ed the req.  When xenbus_thread resumes, it faults on the zero-ed\ndata.\n\nLinux Device Drivers 2nd edition states:\n\"Normally, a wake_up call can cause an immediate reschedule to happen,\nmeaning that other processes might run before wake_up returns.\"\n... which would match the behaviour observed.\n\nChange to keeping two krefs on each request.  One for the caller, and\none for xenbus_thread.  Each will kref_put() when finished, and the last\nwill free it.\n\nThis use of kref matches the description in\nDocumentation/core-api/kref.rst"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/xen/xenbus/xenbus.h","drivers/xen/xenbus/xenbus_comms.c","drivers/xen/xenbus/xenbus_dev_frontend.c","drivers/xen/xenbus/xenbus_xs.c"],"versions":[{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"0e94a246bb6d9538010b6c02d2b1d4717a97b2e5","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"f1bcac367bc95631afbb918348f30dec887d0e1b","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"4d260a5558df4650eb87bc41b2c9ac2d6b2ba447","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"8b02f85e84dc6f7c150cef40ddb69af5a25659e5","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"cbfaf46b88a4c01b64c4186cdccd766c19ae644c","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"8e9c8a0393b5f85f1820c565ab8105660f4e8f92","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"2466b0f66795c3c426cacc8998499f38031dbb59","status":"affected","versionType":"git"},{"version":"fd8aa9095a95c02dcc35540a263267c29b8fda9d","lessThan":"1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/xen/xenbus/xenbus.h","drivers/xen/xenbus/xenbus_comms.c","drivers/xen/xenbus/xenbus_dev_frontend.c","drivers/xen/xenbus/xenbus_xs.c"],"versions":[{"version":"4.11","status":"affected"},{"version":"0","lessThan":"4.11","status":"unaffected","versionType":"semver"},{"version":"5.4.294","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.238","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.183","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.139","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.91","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.29","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.14.7","lessThanOrEqual":"6.14.*","status":"unaffected","versionType":"semver"},{"version":"6.15","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.4.294"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.10.238"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.15.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.1.139"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.6.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.12.29"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.14.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0e94a246bb6d9538010b6c02d2b1d4717a97b2e5"},{"url":"https://git.kernel.org/stable/c/f1bcac367bc95631afbb918348f30dec887d0e1b"},{"url":"https://git.kernel.org/stable/c/4d260a5558df4650eb87bc41b2c9ac2d6b2ba447"},{"url":"https://git.kernel.org/stable/c/8b02f85e84dc6f7c150cef40ddb69af5a25659e5"},{"url":"https://git.kernel.org/stable/c/cbfaf46b88a4c01b64c4186cdccd766c19ae644c"},{"url":"https://git.kernel.org/stable/c/8e9c8a0393b5f85f1820c565ab8105660f4e8f92"},{"url":"https://git.kernel.org/stable/c/2466b0f66795c3c426cacc8998499f38031dbb59"},{"url":"https://git.kernel.org/stable/c/1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27"}],"title":"xenbus: Use kref to track req lifetime","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T19:57:40.135Z"}}]}}