From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BE3C426ED6 for ; Thu, 3 Sep 2026 08:27:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788424033; cv=none; b=ds7DW28ZrhhHYXs+ab+X1l9LvIfjrB5mrQKJSxqGWlKCo+3QBpobKiujBtknWNDynh/NT2CQbKGR4nmCRUvoxJpyoS0Nb75TMLemUc29A67FZkXq57ONNBxkjkWZghMXIsha6/8TQIfWsKEyM2s7ujKX4SuXKkyEAiEzITFj0KQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788424033; c=relaxed/simple; bh=vWpsNPaKle9W4GAmrh969+6iuv/xWPiaZ2MdWfNrfR0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fnbkqmd3EJNKhNYMoSNSfe4OaxAKhiztSoe0fanhKcD8P3Ig9ig5UDI2RFb0Giru8QynJeJWDHmqwWOyI1/+w0Jp5oKzkOzGQHHT1uOkmyQ3ko1jdoQVn/HIqsaFxj71H19sAzAttiQFYhJL5+PIwmsRf1ujFJaGJs9MXhq4GSY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gxh+YUDb; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="gxh+YUDb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B6711F00A3D; Thu, 3 Sep 2026 08:27:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788424031; bh=gScTXLhH/aDOeQezP/F2iBGfeuIU4vHYSBg0yIfHk10=; h=From:To:Cc:Subject:Date:Reply-To; b=gxh+YUDbr8z3tCr3TqJKMgyEhEzPcuNuq4IoKT9Or9VPQDRtFgwpcCEYRzH3QRktd yoxodAkQI0zTDMkQgq7U8Dg0RF66UfdrOkMG6fn+B4blId17wjAvaNxMikdb+8GM/V Jaj5k87OLayp9beUgUJKd/c1iUw/dyBNz96Ip7jA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80756: selinux: do not cancel a policy conversion that never started Date: Thu, 3 Sep 2026 10:26:53 +0200 Message-ID: <2026090340-CVE-2026-80756-95f7@gregkh> X-Mailer: git-send-email 2.55.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3785; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=iDLDc35d6gvUu2UJANKAFMlfJFV6wgaocMLvt04ZBGQ=; b=kA0DAAIRMUfUDdst+ykByyZiAGqZL0ChgH6BQ5GybY6A4gZ6OWwqOHGF9Jgqgr/nh0YTFxnFz IhdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmqZL0AACgkQMUfUDdst+ymkVwCgvc9w Lg08B9VCOC7knHOdGo+PhzkAn2zslQWr2O9OT443Bznd3EZ99WLd X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: selinux: do not cancel a policy conversion that never started sel_write_load() calls selinux_policy_cancel() when sel_make_policy_nodes() fails, and that helper dereferences the outgoing policy to cancel its sidtab conversion. On the first policy load there is no outgoing policy: security_load_policy() returns early for that case, before it converts anything, and state->policy is still NULL. A first load that fails while building the selinuxfs tree therefore takes a NULL dereference in selinux_policy_cancel(), reached from a write(2) to /sys/fs/selinux/load. Skip the cancel when there is no old policy, mirroring the check security_load_policy() already makes before it converts. The Linux kernel CVE team has assigned CVE-2026-80756 to this issue. Affected and fixed versions =========================== Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 5.10.266 with commit 2d29983104f06f5b0babcd5a25a0f0408272cd27 Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 5.15.217 with commit a4f182f8715cb0819445f0850cd5436828f4bafc Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 6.1.184 with commit 1059789ae9f99cbbe3a78e361e9c0976beb5958b Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 6.6.153 with commit 1acc317d67a755a45e32419a15d70e403fa43f0e Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 6.12.105 with commit a42932c6aa33d0aac683cacdf1ec7009b955ba5d Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 6.18.46 with commit 1b4ff94ae7c580c880291519fb0e3e2bd075beef Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 7.1.10 with commit 219c96de5d9b6b4af7e8576ad897b774cc3ee9a7 Issue introduced in 5.10 with commit 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 and fixed in 7.2 with commit e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-80756 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: security/selinux/ss/services.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/2d29983104f06f5b0babcd5a25a0f0408272cd27 https://git.kernel.org/stable/c/a4f182f8715cb0819445f0850cd5436828f4bafc https://git.kernel.org/stable/c/1059789ae9f99cbbe3a78e361e9c0976beb5958b https://git.kernel.org/stable/c/1acc317d67a755a45e32419a15d70e403fa43f0e https://git.kernel.org/stable/c/a42932c6aa33d0aac683cacdf1ec7009b955ba5d https://git.kernel.org/stable/c/1b4ff94ae7c580c880291519fb0e3e2bd075beef https://git.kernel.org/stable/c/219c96de5d9b6b4af7e8576ad897b774cc3ee9a7 https://git.kernel.org/stable/c/e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e