{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-44992","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-08-21T05:34:56.671Z","datePublished":"2024-09-04T19:54:38.878Z","dateUpdated":"2026-08-05T11:37:32.018Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:37:32.018Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: avoid possible NULL dereference in cifs_free_subrequest()\n\nClang static checker (scan-build) warning:\n\tcifsglob.h:line 890, column 3\n\tAccess to field 'ops' results in a dereference of a null pointer.\n\nCommit 519be989717c (\"cifs: Add a tracepoint to track credits involved in\nR/W requests\") adds a check for 'rdata->server', and let clang throw this\nwarning about NULL dereference.\n\nWhen 'rdata->credits.value != 0 && rdata->server == NULL' happens,\nadd_credits_and_wake_if() will call rdata->server->ops->add_credits().\nThis will cause NULL dereference problem. Add a check for 'rdata->server'\nto avoid NULL dereference."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The precondition for the crash — `rdata->server` being NULL while credits are still held — is produced by SMB channel teardown paths (`cifs_chan_skip_or_disable()`, channel reconnect/disable) that are driven by the remote SMB server's responses and multichannel advertisements, so a malicious, compromised, or MITM'd SMB server reached over the network controls the trigger against a mounted client.\nAC:L - A hostile server controls both sides: it drives the reconnect/multichannel-disable that NULLs the channel and it controls response timing, so it can stall in-flight R/W subrequests to hold credits across the window at will. No memory-layout or victim-state condition outside the attacker's influence is needed.\nPR:N - A remote SMB server needs no account, credentials, or privileges on the victim client — the reconnect and channel-negotiation behaviour it abuses is part of normal connection maintenance on an established mount.\nUI:N - Against the common deployment of a persistent SMB mount (fstab/automount on servers, embedded and Android devices), the attacker acts on an already-mounted share with ordinary background readahead and writeback supplying the I/O; no victim action is required at attack time.\nS:U - The fault occurs in the CIFS client inside the kernel and its consequences stay within that same kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a dereference of a NULL `server` pointer to reach `server->ops`, which faults immediately; no out-of-bounds or freed memory is read and no data is returned to the attacker.\nI:N - Nothing is written through the bad pointer — the code path faults on the read of `->ops` before any store, giving no write primitive or control-flow hijack on configurations with the standard non-zero `mmap_min_addr` and SMAP/PAN.\nA:H - The NULL dereference oopses the kernel in netfs subrequest-completion context, which is frequently a workqueue, killing writeback and rendering the mount unusable; the remote server can trigger it repeatedly."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/file.c"],"versions":[{"version":"69c3c023af25edb5433a2db824d3e7cc328f0183","lessThan":"fead60a6d5f84b472b928502a42c419253afe6c1","status":"affected","versionType":"git"},{"version":"69c3c023af25edb5433a2db824d3e7cc328f0183","lessThan":"74c2ab6d653b4c2354df65a7f7f2df1925a40a51","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/client/file.c"],"versions":[{"version":"6.10","status":"affected"},{"version":"0","lessThan":"6.10","status":"unaffected","versionType":"semver"},{"version":"6.10.7","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11","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":"6.10","versionEndExcluding":"6.10.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/fead60a6d5f84b472b928502a42c419253afe6c1"},{"url":"https://git.kernel.org/stable/c/74c2ab6d653b4c2354df65a7f7f2df1925a40a51"}],"title":"smb/client: avoid possible NULL dereference in cifs_free_subrequest()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-09-04T20:19:34.019685Z","id":"CVE-2024-44992","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-04T20:19:53.480Z"}}]}}