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GET /api/patches/2230585/?format=api
{ "id": 2230585, "url": "http://patchwork.ozlabs.org/api/patches/2230585/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260429214512.15496-2-tim.whisonant@canonical.com/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260429214512.15496-2-tim.whisonant@canonical.com>", "list_archive_url": null, "date": "2026-04-29T21:45:09", "name": "[SRU,J/N/Q,1/1] net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "fb53265d74ab5cc3359a4668d20f6aa6eaabf02b", "submitter": { "id": 89903, "url": "http://patchwork.ozlabs.org/api/people/89903/?format=api", "name": "Tim Whisonant", "email": "tim.whisonant@canonical.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260429214512.15496-2-tim.whisonant@canonical.com/mbox/", "series": [ { "id": 502156, "url": "http://patchwork.ozlabs.org/api/series/502156/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=502156", "date": "2026-04-29T21:45:08", "name": "CVE-2026-31533", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502156/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230585/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230585/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=KFToemmv;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "From: Muhammad Alifa Ramdhan <ramdhan@starlabs.sg>\n\nThe -EBUSY handling in tls_do_encryption(), introduced by commit\n859054147318 (\"net: tls: handle backlogging of crypto requests\"), has\na use-after-free due to double cleanup of encrypt_pending and the\nscatterlist entry.\n\nWhen crypto_aead_encrypt() returns -EBUSY, the request is enqueued to\nthe cryptd backlog and the async callback tls_encrypt_done() will be\ninvoked upon completion. That callback unconditionally restores the\nscatterlist entry (sge->offset, sge->length) and decrements\nctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an\nerror, the synchronous error path in tls_do_encryption() performs the\nsame cleanup again, double-decrementing encrypt_pending and\ndouble-restoring the scatterlist.\n\nThe double-decrement corrupts the encrypt_pending sentinel (initialized\nto 1), making tls_encrypt_async_wait() permanently skip the wait for\npending async callbacks. A subsequent sendmsg can then free the\ntls_rec via bpf_exec_tx_verdict() while a cryptd callback is still\npending, resulting in a use-after-free when the callback fires on the\nfreed record.\n\nFix this by skipping the synchronous cleanup when the -EBUSY async\nwait returns an error, since the callback has already handled\nencrypt_pending and sge restoration.\n\nFixes: 859054147318 (\"net: tls: handle backlogging of crypto requests\")\nCc: stable@vger.kernel.org\nSigned-off-by: Muhammad Alifa Ramdhan <ramdhan@starlabs.sg>\nReviewed-by: Sabrina Dubroca <sd@queasysnail.net>\nLink: https://patch.msgid.link/20260403013617.2838875-1-ramdhan@starlabs.sg\nSigned-off-by: Paolo Abeni <pabeni@redhat.com>\n(cherry picked from commit a9b8b18364fffce4c451e6f6fd218fa4ab646705)\nCVE-2026-31533\nSigned-off-by: Tim Whisonant <tim.whisonant@canonical.com>\n---\n net/tls/tls_sw.c | 10 ++++++++++\n 1 file changed, 10 insertions(+)", "diff": "diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c\nindex d5986bb636824..c482307e0677d 100644\n--- a/net/tls/tls_sw.c\n+++ b/net/tls/tls_sw.c\n@@ -573,6 +573,16 @@ static int tls_do_encryption(struct sock *sk,\n \tif (rc == -EBUSY) {\n \t\trc = tls_encrypt_async_wait(ctx);\n \t\trc = rc ?: -EINPROGRESS;\n+\t\t/*\n+\t\t * The async callback tls_encrypt_done() has already\n+\t\t * decremented encrypt_pending and restored the sge on\n+\t\t * both success and error. Skip the synchronous cleanup\n+\t\t * below on error, just remove the record and return.\n+\t\t */\n+\t\tif (rc != -EINPROGRESS) {\n+\t\t\tlist_del(&rec->list);\n+\t\t\treturn rc;\n+\t\t}\n \t}\n \tif (!rc || rc != -EINPROGRESS) {\n \t\tatomic_dec(&ctx->encrypt_pending);\n", "prefixes": [ "SRU", "J/N/Q", "1/1" ] }