{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52616", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-06T09:52:12.089Z", "datePublished": "2024-03-18T10:14:46.066Z", "dateUpdated": "2026-08-05T09:10:44.363Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:44.363Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init\n\nWhen the mpi_ec_ctx structure is initialized, some fields are not\ncleared, causing a crash when referencing the field when the\nstructure was released. Initially, this issue was ignored because\nmemory for mpi_ec_ctx is allocated with the __GFP_ZERO flag.\nFor example, this error will be triggered when calculating the\nZa value for SM2 separately." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Triggered locally when an unprivileged process adds an SM2 X.509 cert via add_key/keyctl, which calls x509_get_sig_params → sm2_compute_z_digest → mpi_ec_init/deinit; no network-facing parser reaches this path.\nAC:L - The attacker solely controls the trigger by submitting an SM2 certificate; sm2_compute_z_digest allocates mpi_ec_ctx with kmalloc (non-zeroed), so garbage non-NULL d/two_inv_p values are freed reliably without depending on victim state.\nPR:L - Any unprivileged local user can add an asymmetric SM2 certificate to their own session/user keyring and exercise the vulnerable Za digest path; no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - Exploitation needs no victim action beyond the attacker’s own add_key/keyctl syscall; certificate parsing and Za computation run entirely in-kernel on that request.\nS:U - Impact is confined to the host kernel’s privilege boundary (crash or local privilege escalation); it does not cross VM, IOMMU, or other distinct security authorities.\nC:H - mpi_ec_deinit frees uninitialized d and two_inv_p pointers from a non-zeroed kmalloc object; with heap spraying of that cache this yields an arbitrary-free primitive that can expose kernel memory.\nI:H - The same attacker-shaped uninitialized free through mpi_free provides a classic arbitrary-free write/control-flow hijack primitive, enabling integrity compromise beyond a pure crash.\nA:H - Freeing or dereferencing garbage MPI pointers in mpi_ec_deinit causes a kernel oops/panic, producing a full denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/crypto/mpi/ec.c" ], "versions": [ { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "0c3687822259a7628c85cd21a3445cbe3c367165", "status": "affected", "versionType": "git" }, { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "2bb86817b33c9d704e127f92b838035a72c315b6", "status": "affected", "versionType": "git" }, { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "bb44477d4506e52785693a39f03cdc6a2c5e8598", "status": "affected", "versionType": "git" }, { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "7ebf812b7019fd2d4d5a7ca45ef4bf3a6f4bda0a", "status": "affected", "versionType": "git" }, { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "7abdfd45a650c714d5ebab564bb1b988f14d9b49", "status": "affected", "versionType": "git" }, { "version": "d58bb7e55a8a65894cc02f27c3e2bf9403e7c40f", "lessThan": "ba3c5574203034781ac4231acf117da917efcd2a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/crypto/mpi/ec.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.210", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.149", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.79", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.15", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.3", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.10", "versionEndExcluding": "5.10.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.149" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.79" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0c3687822259a7628c85cd21a3445cbe3c367165" }, { "url": "https://git.kernel.org/stable/c/2bb86817b33c9d704e127f92b838035a72c315b6" }, { "url": "https://git.kernel.org/stable/c/bb44477d4506e52785693a39f03cdc6a2c5e8598" }, { "url": "https://git.kernel.org/stable/c/7ebf812b7019fd2d4d5a7ca45ef4bf3a6f4bda0a" }, { "url": "https://git.kernel.org/stable/c/7abdfd45a650c714d5ebab564bb1b988f14d9b49" }, { "url": "https://git.kernel.org/stable/c/ba3c5574203034781ac4231acf117da917efcd2a" } ], "title": "crypto: lib/mpi - 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