| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-46913: netfilter: nftables: clone set element expression template |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfilter: nftables: clone set element expression template |
| |
| memcpy() breaks when using connlimit in set elements. Use |
| nft_expr_clone() to initialize the connlimit expression list, otherwise |
| connlimit garbage collector crashes when walking on the list head copy. |
| |
| [ 493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables] |
| [ 493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount] |
| [ 493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83 |
| [ 493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297 |
| [ 493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000 |
| [ 493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0 |
| [ 493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c |
| [ 493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001 |
| [ 493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000 |
| [ 493.064721] FS: 0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000 |
| [ 493.064725] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| [ 493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0 |
| [ 493.064733] Call Trace: |
| [ 493.064737] nf_conncount_gc_list+0x8f/0x150 [nf_conncount] |
| [ 493.064746] nft_rhash_gc+0x106/0x390 [nf_tables] |
| |
| The Linux kernel CVE team has assigned CVE-2021-46913 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit 4094445229760d0d31a4190dfe88fe815c9fc34e and fixed in 5.10.64 with commit e51ff3ffc316377cca21de8b80404eed0c37b3c3 |
| Issue introduced in 5.7 with commit 4094445229760d0d31a4190dfe88fe815c9fc34e and fixed in 5.11.16 with commit 47d8de3c226574a3ddb8b87d0c152028d1bafef4 |
| Issue introduced in 5.7 with commit 4094445229760d0d31a4190dfe88fe815c9fc34e and fixed in 5.12 with commit 4d8f9065830e526c83199186c5f56a6514f457d2 |
| |
| 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-2021-46913 |
| 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/netfilter/nf_tables_api.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/e51ff3ffc316377cca21de8b80404eed0c37b3c3 |
| https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4 |
| https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2 |
