| 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-2021-47250: net: ipv4: fix memory leak in netlbl_cipsov4_add_std |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: ipv4: fix memory leak in netlbl_cipsov4_add_std |
| |
| Reported by syzkaller: |
| BUG: memory leak |
| unreferenced object 0xffff888105df7000 (size 64): |
| comm "syz-executor842", pid 360, jiffies 4294824824 (age 22.546s) |
| hex dump (first 32 bytes): |
| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ |
| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ |
| backtrace: |
| [<00000000e67ed558>] kmalloc include/linux/slab.h:590 [inline] |
| [<00000000e67ed558>] kzalloc include/linux/slab.h:720 [inline] |
| [<00000000e67ed558>] netlbl_cipsov4_add_std net/netlabel/netlabel_cipso_v4.c:145 [inline] |
| [<00000000e67ed558>] netlbl_cipsov4_add+0x390/0x2340 net/netlabel/netlabel_cipso_v4.c:416 |
| [<0000000006040154>] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 net/netlink/genetlink.c:739 |
| [<00000000204d7a1c>] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] |
| [<00000000204d7a1c>] genl_rcv_msg+0x2bf/0x4f0 net/netlink/genetlink.c:800 |
| [<00000000c0d6a995>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 |
| [<00000000d78b9d2c>] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 |
| [<000000009733081b>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] |
| [<000000009733081b>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 |
| [<00000000d5fd43b8>] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929 |
| [<000000000a2d1e40>] sock_sendmsg_nosec net/socket.c:654 [inline] |
| [<000000000a2d1e40>] sock_sendmsg+0x139/0x170 net/socket.c:674 |
| [<00000000321d1969>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 |
| [<00000000964e16bc>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 |
| [<000000001615e288>] __sys_sendmsg+0xd3/0x190 net/socket.c:2433 |
| [<000000004ee8b6a5>] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47 |
| [<00000000171c7cee>] entry_SYSCALL_64_after_hwframe+0x44/0xae |
| |
| The memory of doi_def->map.std pointing is allocated in |
| netlbl_cipsov4_add_std, but no place has freed it. It should be |
| freed in cipso_v4_doi_free which frees the cipso DOI resource. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47250 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 4.4.274 with commit 212166510582631994be4f4b3fe15e10a03c1dd4 |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 4.9.274 with commit 086e92b1d68c6338535f715aad173f8cf4bfbc8c |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 4.14.238 with commit 6dcea66d3bb519b426282588f38e884e07893c1f |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 4.19.196 with commit 5340858147e3dc60913fb3dd0cbb758ec4a26e66 |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 5.4.128 with commit 398a24447eb60f060c8994221cb5ae6caf355fa1 |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 5.10.46 with commit deeeb65c6ee404f2d1fb80b38b2730645c0f4663 |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 5.12.13 with commit 0ffb460be3abac86f884a8c548bb02724ec370f4 |
| Issue introduced in 2.6.19 with commit 96cb8e3313c7a12e026c1ed510522ae6f6023875 and fixed in 5.13 with commit d612c3f3fae221e7ea736d196581c2217304bbbc |
| |
| 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-2021-47250 |
| 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/ipv4/cipso_ipv4.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/212166510582631994be4f4b3fe15e10a03c1dd4 |
| https://git.kernel.org/stable/c/086e92b1d68c6338535f715aad173f8cf4bfbc8c |
| https://git.kernel.org/stable/c/6dcea66d3bb519b426282588f38e884e07893c1f |
| https://git.kernel.org/stable/c/5340858147e3dc60913fb3dd0cbb758ec4a26e66 |
| https://git.kernel.org/stable/c/398a24447eb60f060c8994221cb5ae6caf355fa1 |
| https://git.kernel.org/stable/c/deeeb65c6ee404f2d1fb80b38b2730645c0f4663 |
| https://git.kernel.org/stable/c/0ffb460be3abac86f884a8c548bb02724ec370f4 |
| https://git.kernel.org/stable/c/d612c3f3fae221e7ea736d196581c2217304bbbc |
