{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31431", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.089Z", "datePublished": "2026-04-22T08:15:10.123Z", "dateUpdated": "2026-09-01T12:04:50.194Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:25.522Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings. Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly." } ], "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 - The vulnerable algif_aead path is reached through local AF_ALG socket syscalls: socket, bind, setsockopt, accept, sendmsg, and recvmsg. It is not directly reachable from remote network packets.\nAC:L - A local attacker can construct the AF_ALG AEAD request, choose buffer layout, AAD/tag lengths, and invoke recvmsg directly. Any race or SGL layout condition is attacker-controlled from the same process.\nPR:L - Creating and using AF_ALG AEAD sockets requires only an unprivileged local user on systems with CRYPTO_USER_API_AEAD enabled. The traced socket, bind, setsockopt, accept, sendmsg, and recvmsg paths do not require CAP_SYS_ADMIN or other real root privileges.\nUI:N - No victim interaction is needed once the attacker has local code execution. The attacker can open and drive the AF_ALG socket entirely through syscalls.\nS:U - The issue remains within the kernel/user crypto API security authority and does not cross a VM, IOMMU, or separate sandbox boundary. This is a standard local kernel attack surface.\nC:H - The removed in-place AEAD design used user-writable RX scatterlists as crypto source data and chained TX tag pages, creating a plausible decryption/authentication bypass for data protected by secret AEAD keys. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The bug undermines AEAD authenticity by allowing source data used by the crypto operation to diverge from the data originally submitted and authenticated. This can allow forged or corrupted plaintext/ciphertext results, so integrity impact is high.\nA:H - The vulnerable path builds complex chained scatterlists from attacker-controlled local buffers and related AF_ALG fixes show these paths can lead to scatterwalk NULL dereferences and kernel panics. A local attacker can repeatedly trigger the operation, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "crypto/af_alg.c", "crypto/algif_aead.c", "crypto/algif_skcipher.c", "include/crypto/if_alg.h" ], "versions": [ { "version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7", "lessThan": "893d22e0135fa394db81df88697fba6032747667", "status": "affected", "versionType": "git" }, { "version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7", "lessThan": "19d43105a97be0810edbda875f2cd03f30dc130c", "status": "affected", "versionType": "git" }, { "version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7", "lessThan": "961cfa271a918ad4ae452420e7c303149002875b", "status": "affected", "versionType": "git" }, { "version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7", "lessThan": "3115af9644c342b356f3f07a4dd1c8905cd9a6fc", "status": "affected", 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"value": "RHSA-2026:15976: Red Hat Enterprise Linux BaseOS (v. 8)" }, { "lang": "en", "value": "RHSA-2026:14165: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)" }, { "lang": "en", "value": "RHSA-2026:14230: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6)" }, { "lang": "en", "value": "RHSA-2026:16111: Red Hat Enterprise Linux BaseOS E4S (v.8.6)" }, { "lang": "en", "value": "RHSA-2026:13681: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)" }, { "lang": "en", "value": "RHSA-2026:16210: Red Hat Enterprise Linux BaseOS E4S (v.8.8)" }, { "lang": "en", "value": "RHSA-2026:16209: Red Hat Enterprise Linux BaseOS E4S (v.9.0)" }, { "lang": "en", "value": "RHSA-2026:16208: Red Hat Enterprise Linux BaseOS E4S (v.9.2)" }, { "lang": "en", "value": "RHSA-2026:16063: Red Hat Enterprise Linux BaseOS EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:16018: Red Hat Enterprise Linux BaseOS EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:15978: Red Hat Enterprise Linux BaseOS (v. 9)" }, { "lang": "en", "value": "RHSA-2026:13578: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)" }, { "lang": "en", "value": "RHSA-2026:14137: Red Hat Enterprise Linux NFV E4S (v.9.0), Red Hat Enterprise Linux Real Time E4S (v.9.0)" }, { "lang": "en", "value": "RHSA-2026:14301: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)" } ], "timeline": [ { "lang": "en", "time": "2026-04-22T00:00:00.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-04-22T00:00:00.000Z", "value": "Made public." } ], "title": "kernel: crypto: algif_aead - Revert to operating out-of-place", "workarounds": [ { "lang": "en", "value": "See the security bulletin for a detailed mitigation procedure." } ], "x_adpType": "supplier", "x_generator": { "engine": 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