From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 52EE018BC3D for ; Wed, 16 Apr 2025 14:15:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744812913; cv=none; b=XhJtbN7WpXd3U+Bo2NsXd6+B1EJyoS8nx5tRg0sVfx5nwjRPw9s6GsDCEe/66yKDzYHJSerOoUaU54W6I/zBpfTeqQLG17/nGkNOB/l1vfhLGYnOugnu69WfptLa8UcfCw6J7dSIFdIv6A0OBj7lLsMGtp09xxD0HMS67su/fBw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744812913; c=relaxed/simple; bh=iVSCMKEsmotQ9N0NR1QCMki/obg23l/mD3BjmlT19uc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=R/Bn0mwtPQF4aSKuez6yhh0iQcwaXaNs9h5dRYb/VUH1Q1fbZOy0soYiBwRYUAn5DsrPaaJdvGAATfBi0otdPyB7mtPDY/hzJR4pmxYJ6u57BQIiTJD97qg6VQefIzIER2G+iCzjFl12Vl9NWXbMPEwvY0InMqU90us8UYSzVRM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=moPkk5/P; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="moPkk5/P" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D08D0C4CEE2; Wed, 16 Apr 2025 14:15:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744812913; bh=iVSCMKEsmotQ9N0NR1QCMki/obg23l/mD3BjmlT19uc=; h=From:To:Cc:Subject:Date:Reply-to:From; b=moPkk5/Pnb5e1w2gv8pYEgaQ640Fdfl8vFW5IqPXzPm+aZw5NlfH5dt+NOwHACU80 qfnig9lqbz9lamYQYcNnQ2ndvBK/CkUvS0E2F5M5XEzK5sYYx0dkraHFyo6KnXEBeT hPAwD7JQ5VER3cuU7bQKfVwQSK3M+bIPeAydPuCA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-22057: net: decrease cached dst counters in dst_release Date: Wed, 16 Apr 2025 16:12:28 +0200 Message-ID: <2025041605-CVE-2025-22057-fb12@gregkh> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=3229; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=iVSCMKEsmotQ9N0NR1QCMki/obg23l/mD3BjmlT19uc=; b=owGbwMvMwCRo6H6F97bub03G02pJDOn/d21lOMeyKmFi2fmpk24JT6xj2cO0Ybl3xfxu+W/be 42/urIodsSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmcCGcHEKwET6axnmcJY53FthZJlxs0Lu VWR7kbu8RXYQw1zx+9dK2FuSnhrv++f3XdnrMOsbg2IA X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: net: decrease cached dst counters in dst_release Upstream fix ac888d58869b ("net: do not delay dst_entries_add() in dst_release()") moved decrementing the dst count from dst_destroy to dst_release to avoid accessing already freed data in case of netns dismantle. However in case CONFIG_DST_CACHE is enabled and OvS+tunnels are used, this fix is incomplete as the same issue will be seen for cached dsts: Unable to handle kernel paging request at virtual address ffff5aabf6b5c000 Call trace: percpu_counter_add_batch+0x3c/0x160 (P) dst_release+0xec/0x108 dst_cache_destroy+0x68/0xd8 dst_destroy+0x13c/0x168 dst_destroy_rcu+0x1c/0xb0 rcu_do_batch+0x18c/0x7d0 rcu_core+0x174/0x378 rcu_core_si+0x18/0x30 Fix this by invalidating the cache, and thus decrementing cached dst counters, in dst_release too. The Linux kernel CVE team has assigned CVE-2025-22057 to this issue. Affected and fixed versions =========================== Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.6.87 with commit ccc331fd5bcae131d2627d5ef099d4a1f6540aea Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.12.23 with commit 92a5c18513117be69bc00419dd1724c1940f8fcd Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.13.11 with commit 836415a8405c9665ae55352fc5ba865c242f5e4f Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.14.2 with commit e833e7ad64eb2f63867f65303be49ca30ee8819e Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.15-rc1 with commit 3a0a3ff6593d670af2451ec363ccb7b18aec0c0a 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-2025-22057 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: net/core/dst.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/ccc331fd5bcae131d2627d5ef099d4a1f6540aea https://git.kernel.org/stable/c/92a5c18513117be69bc00419dd1724c1940f8fcd https://git.kernel.org/stable/c/836415a8405c9665ae55352fc5ba865c242f5e4f https://git.kernel.org/stable/c/e833e7ad64eb2f63867f65303be49ca30ee8819e https://git.kernel.org/stable/c/3a0a3ff6593d670af2451ec363ccb7b18aec0c0a