{"cve":"CVE-2023-53599","nvd":{"published":"2025-10-04T16:15:56.497","modified":"2026-08-04T10:19:13.967","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Fix missing initialisation affecting gcm-aes-s390\n\nFix af_alg_alloc_areq() to initialise areq->first_rsgl.sgl.sgt.sgl to point\nto the scatterlist array in areq->first_rsgl.sgl.sgl.\n\nWithout this, the gcm-aes-s390 driver will oops when it tries to do\ngcm_walk_start() on req->dst because req->dst is set to the value of\nareq->first_rsgl.sgl.sgl by _aead_recvmsg() calling\naead_request_set_crypt().\n\nThe problem comes if an empty ciphertext is passed: the loop in\naf_alg_get_rsgl() just passes straight out and doesn't set areq->first_rsgl\nup.\n\nThis isn't a problem on x86_64 using gcmaes_crypt_by_sg() because, as far\nas I can tell, that ignores req->dst and only uses req->src[*].\n\n[*] Is this a bug in aesni-intel_glue.c?\n\nThe s390x oops looks something like:\n\n Unable to handle kernel pointer dereference in virtual kernel address space\n Failing address: 0000000a00000000 TEID: 0000000a00000803\n Fault in home space mode while using kernel ASCE.\n AS:00000000a43a0007 R3:0000000000000024\n Oops: 003b ilc:2 [#1] SMP\n ...\n Call Trace:\n  [<000003ff7fc3d47e>] gcm_walk_start+0x16/0x28 [aes_s390]\n  [<00000000a2a342f2>] crypto_aead_decrypt+0x9a/0xb8\n  [<00000000a2a60888>] aead_recvmsg+0x478/0x698\n  [<00000000a2e519a0>] sock_recvmsg+0x70/0xb0\n  [<00000000a2e51a56>] sock_read_iter+0x76/0xa0\n  [<00000000a273e066>] vfs_read+0x26e/0x2a8\n  [<00000000a273e8c4>] ksys_read+0xbc/0x100\n  [<00000000a311d808>] __do_syscall+0x1d0/0x1f8\n  [<00000000a312ff30>] system_call+0x70/0x98\n Last Breaking-Event-Address:\n  [<000003ff7fc3e6b4>] gcm_aes_crypt+0x104/0xa68 [aes_s390]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/2c9d205040d7c0eaccc473917f9b0bb0a923e440","https://git.kernel.org/stable/c/6a4b8aa0a916b39a39175584c07222434fa6c6ef"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2023-53599","score":0.00137,"percentile":0.0312,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}