{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-37926","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.969Z","datePublished":"2025-05-20T15:21:53.359Z","dateUpdated":"2026-08-05T11:58:26.156Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:58:26.156Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in ksmbd_session_rpc_open\n\nA UAF issue can occur due to a race condition between\nksmbd_session_rpc_open() and __session_rpc_close().\nAdd rpc_lock to the session to protect it."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the entire attack consists of SMB2 CREATE and CLOSE PDUs sent over the network to the IPC$ share. No local access is needed at any point.\nAC:L - The attacker drives both sides of the race by pipelining concurrent SMB2 requests on one connection (ksmbd's workqueue has no per-connection serialization), and the race window spans a blocking userspace IPC round-trip of up to 2 seconds, while the target handle ID is a predictable small `ida_alloc()` value.\nPR:L - Reaching create_smb2_pipe() requires a completed SMB2 SESSION_SETUP and a TREE_CONNECT to IPC$, i.e. any valid low-privileged SMB account (or a guest account where mapping is enabled). This matches the scoring of the sibling ksmbd session UAFs CVE-2025-22040/CVE-2025-22041.\nUI:N - The attacker generates every request in the sequence; no action by a legitimate user or administrator is required to trigger the race.\nS:U - The corruption is confined to the kernel's own heap and the ksmbd server's data structures, all within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The success path returns `entry->id` read from freed slab memory and sends it back to the attacker as the CREATE response VolatileFileId, directly leaking reclaimed kernel heap contents, and the UAF/double-free of a small generic-cache object gives a spray-controlled read primitive.\nI:H - The error path double-frees the entry and calls ksmbd_rpc_id_free() on a stale IDA id now owned by a different live RPC handle, yielding freelist corruption and cross-handle aliasing that are classic stepping stones to arbitrary write and control-flow hijack in kernel context.\nA:H - Use-after-free and double-free of a kmalloc object reliably produce slab corruption, oops, or panic, and the attacker can repeat the race indefinitely over new sessions to crash the server."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/mgmt/user_session.c","fs/smb/server/mgmt/user_session.h"],"versions":[{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","lessThan":"a4348710a7267705b75692dc1a000920481d1d92","status":"affected","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","lessThan":"1067361a1cc6ad9cdf7acfc47f90012b72ad1502","status":"affected","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","lessThan":"8fb3b6c85b7e3127161623586b62abcc366caa20","status":"affected","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","lessThan":"6323fec65fe54b365961fed260dd579191e46121","status":"affected","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","lessThan":"a1f46c99d9ea411f9bf30025b912d881d36fc709","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/mgmt/user_session.c","fs/smb/server/mgmt/user_session.h"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.122","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.28","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.14.6","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":"5.15","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.14.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a4348710a7267705b75692dc1a000920481d1d92"},{"url":"https://git.kernel.org/stable/c/1067361a1cc6ad9cdf7acfc47f90012b72ad1502"},{"url":"https://git.kernel.org/stable/c/8fb3b6c85b7e3127161623586b62abcc366caa20"},{"url":"https://git.kernel.org/stable/c/6323fec65fe54b365961fed260dd579191e46121"},{"url":"https://git.kernel.org/stable/c/a1f46c99d9ea411f9bf30025b912d881d36fc709"}],"title":"ksmbd: fix use-after-free in ksmbd_session_rpc_open","x_generator":{"engine":"bippy-1.2.0"}}}}