{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38737","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:24.034Z","datePublished":"2025-09-05T17:20:37.719Z","dateUpdated":"2026-08-05T12:04:26.998Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:04:26.998Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix oops due to uninitialised variable\n\nFix smb3_init_transform_rq() to initialise buffer to NULL before calling\nnetfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it\nis given.  Setting it to NULL means it should start a fresh buffer, but the\nvalue is currently undefined."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable path is the SMB3 client transport-encryption routine, and whether it is entered is dictated by server-supplied SESSION_SETUP/TREE_CONNECT flags (SMB2_SESSION_FLAG_ENCRYPT_DATA / SHI1005_FLAGS_ENCRYPT_DATA), so a remote or MITM SMB server across the network selects the vulnerable path and receives the leaked plaintext of the corrupted buffer.\nAC:L - Once encryption is negotiated, every write with a payload runs the uninitialised pointer through netfs_alloc_folioq_buffer(); the stack slot is reachable and groomable via ordinary syscall sequences on the writing task's kernel stack, with no condition outside the attacker's influence.\nPR:N - The remote SMB server presents no credentials to the client and needs none to set the encryption flags that gate the path; on the local side, any user holding a normal write handle to the mounted share triggers it with no elevated privileges.\nUI:N - An already-mounted share reaches the path through routine writeback and automatic reconnect (which re-runs session setup and tree connect), so no victim action beyond normal use of an existing mount is required.\nS:U - The wild reads, writes and bogus folio_put()s all occur within the kernel's own memory and the same security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Because *_buffer is never reassigned, the garbage folio_queue is used as the ITER_SOURCE for crypt_message(), so arbitrary kernel memory pointed to by the stale chain is encrypted and sent to the remote peer, and freeing the chain yields further use-after-free read primitives.\nI:H - netfs_alloc_folioq_buffer() writes through the garbage pointer (tail->next = p, p->prev = tail, folioq_append_mark()), and cifs_copy_iter_to_folioq() then copies attacker-supplied write() data into folios derived from that chain, giving a content-controlled kernel write suitable for control-flow hijacking.\nA:H - The commit is titled \"Fix oops due to uninitialised variable\" — dereferencing the indeterminate pointer oopses the kernel, and the resulting folio_queue/folio refcount corruption and bogus frees cause further panics."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"],"versions":[{"version":"a2906d3316fc19bf0ade84618bb73eab604c447e","lessThan":"4931fe2dbe1cc0e7d350a4b51b0b330e43971d98","status":"affected","versionType":"git"},{"version":"a2906d3316fc19bf0ade84618bb73eab604c447e","lessThan":"6adaa9fae36f848afa7278945d725e197e33c496","status":"affected","versionType":"git"},{"version":"a2906d3316fc19bf0ade84618bb73eab604c447e","lessThan":"453a6d2a68e54a483d67233c6e1e24c4095ee4be","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/smb2ops.c"],"versions":[{"version":"6.12","status":"affected"},{"version":"0","lessThan":"6.12","status":"unaffected","versionType":"semver"},{"version":"6.12.44","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.4","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","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":"6.12","versionEndExcluding":"6.12.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.16.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4931fe2dbe1cc0e7d350a4b51b0b330e43971d98"},{"url":"https://git.kernel.org/stable/c/6adaa9fae36f848afa7278945d725e197e33c496"},{"url":"https://git.kernel.org/stable/c/453a6d2a68e54a483d67233c6e1e24c4095ee4be"}],"title":"cifs: Fix oops due to uninitialised variable","x_generator":{"engine":"bippy-1.2.0"}}}}