{"id":"CVE-2026-97589","state":"PUBLISHED","title":"s390/crypto: Fix wrong return code to engine in asynch callbacks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/crypto: Fix wrong return code to engine in asynch callbacks\n\nWhen crypto_finalize_hash_request() or\ncrypto_finalize_skcipher_request() explicitly completes a request, the\ndo_one_request callback must return 0 to indicate successful\nhandling. Returning a negative error code causes the crypto engine to\nassume the driver failed to take ownership and triggers a second\ncompletion via crypto_request_complete(), resulting in a double\ncompletion. This pattern occurs in paes_s390.c 4 times and once in\nphmac_s390.c.\n\nFixed in phmac_do_one_request() and all four paes do_one_request\ncallbacks (ecb, cbc, ctr, xts) by returning 0 after explicit\nfinalization instead of propagating the error code.","publishedAt":"2026-09-25T10:22:07.441Z","updatedAt":"2026-10-19T09:09:53.140Z","severity":{"score":7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"972e0d9b7d1d112240ccde1f1be85bf9ffaa1720","versionType":"git"},{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"5480291aa848e19e61175abfd457933516db70c6","versionType":"git"},{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"ac1481320110b803ab9b79ab4d2ca11a74fc05f2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/crypto/paes_s390.c","arch/s390/crypto/phmac_s390.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/crypto/paes_s390.c","arch/s390/crypto/phmac_s390.c"]}],"references":["https://git.kernel.org/stable/c/972e0d9b7d1d112240ccde1f1be85bf9ffaa1720","https://git.kernel.org/stable/c/5480291aa848e19e61175abfd457933516db70c6","https://git.kernel.org/stable/c/ac1481320110b803ab9b79ab4d2ca11a74fc05f2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97589.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97589","state":"PUBLISHED","datePublished":"2026-09-25T10:22:07.441Z","dateUpdated":"2026-10-19T09:09:53.140Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.157Z"},"containers":{"cna":{"title":"s390/crypto: Fix wrong return code to engine in asynch callbacks","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/crypto: Fix wrong return code to engine in asynch callbacks\n\nWhen crypto_finalize_hash_request() or\ncrypto_finalize_skcipher_request() explicitly completes a request, the\ndo_one_request callback must return 0 to indicate successful\nhandling. Returning a negative error code causes the crypto engine to\nassume the driver failed to take ownership and triggers a second\ncompletion via crypto_request_complete(), resulting in a double\ncompletion. This pattern occurs in paes_s390.c 4 times and once in\nphmac_s390.c.\n\nFixed in phmac_do_one_request() and all four paes do_one_request\ncallbacks (ecb, cbc, ctr, xts) by returning 0 after explicit\nfinalization instead of propagating the error code."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"972e0d9b7d1d112240ccde1f1be85bf9ffaa1720","versionType":"git"},{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"5480291aa848e19e61175abfd457933516db70c6","versionType":"git"},{"version":"6cd87cb5ef6ca50ae17c371482ceaab1d635e232","status":"affected","lessThan":"ac1481320110b803ab9b79ab4d2ca11a74fc05f2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/crypto/paes_s390.c","arch/s390/crypto/phmac_s390.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/crypto/paes_s390.c","arch/s390/crypto/phmac_s390.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/972e0d9b7d1d112240ccde1f1be85bf9ffaa1720"},{"url":"https://git.kernel.org/stable/c/5480291aa848e19e61175abfd457933516db70c6"},{"url":"https://git.kernel.org/stable/c/ac1481320110b803ab9b79ab4d2ca11a74fc05f2"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The faulty return is in ecb/cbc/ctr/xts_paes_do_one_request() and phmac_do_one_request(), which run in the crypto engine worker. They are reached through local crypto API users: AF_ALG sockets binding \"ecb(paes)\" etc. (algif_skcipher recvmsg -> ecb_paes_crypt -> engine) or dm-crypt. No remote peer supplies the data that causes the failure.\nAC:H - The double completion fires only when the engine path returns an error. That needs the protected key to be invalidated (-EKEYEXPIRED, e.g. the wrapping key changed) and then re-conversion to fail in paes_convert_key() because the card is busy or offline. AF_ALG blocks setkey while op sockets exist, so the attacker cannot force this state.\nPR:L - AF_ALG socket creation and binding the paes/phmac algorithms need no capability, so a local unprivileged user holding usable key material can push requests through the paes engine path.\nUI:N - No victim action is needed. Once the engine-side failure condition exists, the attacker's own AF_ALG requests (or ordinary dm-crypt I/O) hit the double completion.\nS:U - The corruption stays within the kernel's own security authority. There is no guest-to-host or other boundary crossing.\nC:H - crypto_pump_requests() calls crypto_request_complete() a second time after crypto_finalize_skcipher_request(). In AF_ALG the extra complete of ctx->wait lets a later request's areq be freed while the engine still processes it, so the engine keeps reading freed memory (use-after-free).\nI:H - The engine's skcipher walk and cpacf output keep writing into the freed request and scatterlist memory. For dm-crypt, the same bio completes twice. Both are use-after-free writes that can be used for heap corruption.\nA:H - The double completion corrupts request/bio lifetime (double bio end or a use-after-free on the areq), which can crash the kernel or corrupt dm-crypt I/O."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:09:53.140Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}