{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53046", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.381Z", "datePublished": "2026-06-24T16:29:52.676Z", "dateUpdated": "2026-08-05T12:32:53.990Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:53.990Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free from async crypto on Qualcomm crypto engine\n\nksmbd_crypt_message() sets a NULL completion callback on AEAD requests\nand does not handle the -EINPROGRESS return code from async hardware\ncrypto engines like the Qualcomm Crypto Engine (QCE). When QCE returns\n-EINPROGRESS, ksmbd treats it as an error and immediately frees the\nrequest while the hardware DMA operation is still in flight. The DMA\ncompletion callback then dereferences freed memory, causing a NULL\npointer crash:\n\n pc : qce_skcipher_done+0x24/0x174\n lr : vchan_complete+0x230/0x27c\n ...\n el1h_64_irq+0x68/0x6c\n ksmbd_free_work_struct+0x20/0x118 [ksmbd]\n ksmbd_exit_file_cache+0x694/0xa4c [ksmbd]\n\nUse the standard crypto_wait_req() pattern with crypto_req_done() as\nthe completion callback, matching the approach used by the SMB client\nin fs/smb/client/smb2ops.c. This properly handles both synchronous\nengines (immediate return) and async engines (-EINPROGRESS followed\nby callback notification)." } ], "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 code is in ksmbd, the in-kernel SMB server, and is reached by SMB3 encrypted requests/responses over the network transport such as TCP port 445.\nAC:L - Once targeting a ksmbd server using an async crypto engine such as Qualcomm QCE, the attacker can trigger the bad -EINPROGRESS handling by sending encrypted SMB3 traffic; there is no attacker-uncontrolled race to win.\nPR:N - The path requires a valid SMB3 session, but ksmbd supports guest/anonymous sessions that still negotiate encryption keys, making no prior privileges or credentials necessary in a reasonable guest-enabled deployment.\nUI:N - No victim user action is required; the attacker sends SMB traffic directly to the server.\nS:U - The vulnerability corrupts kernel memory within the same host security authority and does not cross a separate boundary such as guest-to-host virtualization.\nC:H - This is a kernel heap use-after-free of an AEAD request and driver-private context, which can plausibly be shaped into memory disclosure primitives beyond the observed crash.\nI:H - The freed request is dereferenced by async crypto completion and contains pointers/callback-related state, so the UAF is defensibly treated as exploitable kernel memory corruption with potential code execution or arbitrary modification.\nA:H - The reported failure is a kernel crash during async crypto completion, and repeated network-triggered UAFs can deny service to the ksmbd host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/auth.c" ], "versions": [ { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "57b47231055b431ed0a1a55f33cac32981564405", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "cc2da381875d4a67026e4c8feb3dba51a2a2d1bc", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "8fcefe840fa8c14ce667768e5b043286ac3bbcbe", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "8ef183216feaa24b66b940510d8b68f680eb56e9", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "7164b3953cefd540e7ebca828c793bc6869cfbc4", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "b46aa129fa2807bfe1545fe74d9295d53c51520b", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "3e298897f41c61450c2e7a4f457e8b2485eb35b3", "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/auth.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/57b47231055b431ed0a1a55f33cac32981564405" }, { "url": "https://git.kernel.org/stable/c/cc2da381875d4a67026e4c8feb3dba51a2a2d1bc" }, { "url": "https://git.kernel.org/stable/c/8fcefe840fa8c14ce667768e5b043286ac3bbcbe" }, { "url": "https://git.kernel.org/stable/c/8ef183216feaa24b66b940510d8b68f680eb56e9" }, { "url": "https://git.kernel.org/stable/c/7164b3953cefd540e7ebca828c793bc6869cfbc4" }, { "url": "https://git.kernel.org/stable/c/b46aa129fa2807bfe1545fe74d9295d53c51520b" }, { "url": "https://git.kernel.org/stable/c/3e298897f41c61450c2e7a4f457e8b2485eb35b3" } ], "title": "ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine", "x_generator": { "engine": "bippy-1.2.0" } } } }