In the Linux kernel, the following vulnerability has been resolved: bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue Fix NULL pointer data-races in sk_psock_skb_ingress_enqueue() which syzbot reported [1]. [1] BUG: KCSAN: data-race in sk_psock_drop / sk_psock_skb_ingress_enqueue write to 0xffff88814b3278b8 of 8 bytes by task 10724 on cpu 1: sk_psock_stop_verdict net/core/skmsg.c:1257 [inline] sk_psock_drop+0x13e/0x1f0 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:459 [inline] sock_map_close+0x1a7/0x260 net/core/sock_map.c:1648 unix_release+0x4b/0x80 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0x68/0x150 net/socket.c:1421 __fput+0x2c1/0x660 fs/file_table.c:422 __fput_sync+0x44/0x60 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x101/0x1b0 fs/open.c:1541 __x64_sys_close+0x1f/0x30 fs/open.c:1541 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffff88814b3278b8 of 8 bytes by task 10713 on cpu 0: sk_psock_data_ready include/linux/skmsg.h:464 [inline] sk_psock_skb_ingress_enqueue+0x32d/0x390 net/core/skmsg.c:555 sk_psock_skb_ingress_self+0x185/0x1e0 net/core/skmsg.c:606 sk_psock_verdict_apply net/core/skmsg.c:1008 [inline] sk_psock_verdict_recv+0x3e4/0x4a0 net/core/skmsg.c:1202 unix_read_skb net/unix/af_unix.c:2546 [inline] unix_stream_read_skb+0x9e/0xf0 net/unix/af_unix.c:2682 sk_psock_verdict_data_ready+0x77/0x220 net/core/skmsg.c:1223 unix_stream_sendmsg+0x527/0x860 net/unix/af_unix.c:2339 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 ____sys_sendmsg+0x312/0x410 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x1e9/0x280 net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 value changed: 0xffffffff83d7feb0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10713 Comm: syz-executor.4 Tainted: G W 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Prior to this, commit 4cd12c6065df ("bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()") fixed one NULL pointer similarly due to no protection of saved_data_ready. Here is another different caller causing the same issue because of the same reason. So we should protect it with sk_callback_lock read lock because the writer side in the sk_psock_drop() uses "write_lock_bh(&sk->sk_callback_lock);". To avoid errors that could happen in future, I move those two pairs of lock into the sk_psock_data_ready(), which is suggested by John Fastabend.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2024-643 advisory.

    2024-07-03: CVE-2024-26900 was added to this advisory.

    2024-07-03: CVE-2024-36883 was added to this advisory.

    2024-07-03: CVE-2024-36938 was added to this advisory.

    2024-07-03: CVE-2024-36940 was added to this advisory.

    2024-07-03: CVE-2024-36902 was added to this advisory.

    2024-07-03: CVE-2024-36937 was added to this advisory.

    2024-07-03: CVE-2024-36017 was added to this advisory.

    2024-07-03: CVE-2024-36939 was added to this advisory.

    2024-07-03: CVE-2024-35947 was added to this advisory.

    2024-07-03: CVE-2024-36889 was added to this advisory.

    2024-07-03: CVE-2024-36944 was added to this advisory.

    2024-07-03: CVE-2024-36904 was added to this advisory.

    2024-07-03: CVE-2024-36929 was added to this advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    md: fix kmemleak of rdev->serial (CVE-2024-26900)

    In the Linux kernel, the following vulnerability has been resolved:

    dyndbg: fix old BUG_ON in >control parser (CVE-2024-35947)

    In the Linux kernel, the following vulnerability has been resolved:

    rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation (CVE-2024-36017)

    In the Linux kernel, the following vulnerability has been resolved:

    net: fix out-of-bounds access in ops_init (CVE-2024-36883)

    In the Linux kernel, the following vulnerability has been resolved:

    mptcp: ensure snd_nxt is properly initialized on connect (CVE-2024-36889)

    In the Linux kernel, the following vulnerability has been resolved:

    ipv6: fib6_rules: avoid possible NULL dereference in fib6_rule_action() (CVE-2024-36902)

    In the Linux kernel, the following vulnerability has been resolved:

    tcp: Use refcount_inc_not_zero() in tcp_twsk_unique(). (CVE-2024-36904)

    In the Linux kernel, the following vulnerability has been resolved:

    tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets (CVE-2024-36905)

    In the Linux kernel, the following vulnerability has been resolved:

    blk-iocost: avoid out of bounds shift (CVE-2024-36916)

    In the Linux kernel, the following vulnerability has been resolved:

    net: core: reject skb_copy(_expand) for fraglist GSO skbs (CVE-2024-36929)

    In the Linux kernel, the following vulnerability has been resolved:

    nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). (CVE-2024-36933)

    In the Linux kernel, the following vulnerability has been resolved:

    xdp: use flags field to disambiguate broadcast redirect (CVE-2024-36937)

    In the Linux kernel, the following vulnerability has been resolved:

    bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue (CVE-2024-36938)

    In the Linux kernel, the following vulnerability has been resolved:

    nfs: Handle error of rpc_proc_register() in nfs_net_init(). (CVE-2024-36939)

    In the Linux kernel, the following vulnerability has been resolved:

    pinctrl: core: delete incorrect free in pinctrl_enable() (CVE-2024-36940)

    In the Linux kernel, the following vulnerability has been resolved:

    Reapply drm/qxl: simplify qxl_fence_wait (CVE-2024-36944)

    In the Linux kernel, the following vulnerability has been resolved:

    pinctrl: devicetree: fix refcount leak in pinctrl_dt_to_map() (CVE-2024-36959)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 5.15.160-104.158. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2024-044 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    md: fix kmemleak of rdev->serial (CVE-2024-26900)

    In the Linux kernel, the following vulnerability has been resolved:

    dyndbg: fix old BUG_ON in >control parser (CVE-2024-35947)

    In the Linux kernel, the following vulnerability has been resolved:

    rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation (CVE-2024-36017)

    In the Linux kernel, the following vulnerability has been resolved:

    net: fix out-of-bounds access in ops_init (CVE-2024-36883)

    In the Linux kernel, the following vulnerability has been resolved:

    mptcp: ensure snd_nxt is properly initialized on connect (CVE-2024-36889)

    In the Linux kernel, the following vulnerability has been resolved:

    ipv6: fib6_rules: avoid possible NULL dereference in fib6_rule_action() (CVE-2024-36902)

    In the Linux kernel, the following vulnerability has been resolved:

    tcp: Use refcount_inc_not_zero() in tcp_twsk_unique(). (CVE-2024-36904)

    In the Linux kernel, the following vulnerability has been resolved:

    tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets (CVE-2024-36905)

    In the Linux kernel, the following vulnerability has been resolved:

    ARM: 9381/1: kasan: clear stale stack poison (CVE-2024-36906)

    In the Linux kernel, the following vulnerability has been resolved:

    blk-iocost: avoid out of bounds shift (CVE-2024-36916)

    In the Linux kernel, the following vulnerability has been resolved:

    net: core: reject skb_copy(_expand) for fraglist GSO skbs (CVE-2024-36929)

    In the Linux kernel, the following vulnerability has been resolved:

    nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). (CVE-2024-36933)

    In the Linux kernel, the following vulnerability has been resolved:

    xdp: use flags field to disambiguate broadcast redirect (CVE-2024-36937)

    In the Linux kernel, the following vulnerability has been resolved:

    bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue (CVE-2024-36938)

    In the Linux kernel, the following vulnerability has been resolved:

    nfs: Handle error of rpc_proc_register() in nfs_net_init(). (CVE-2024-36939)

    In the Linux kernel, the following vulnerability has been resolved:

    pinctrl: core: delete incorrect free in pinctrl_enable() (CVE-2024-36940)

    In the Linux kernel, the following vulnerability has been resolved:

    pinctrl: devicetree: fix refcount leak in pinctrl_dt_to_map() (CVE-2024-36959)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
201009	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2024:2190-1)	Nessus	SuSE Local Security Checks	critical
200913	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2024-643)	Nessus	Amazon Linux Local Security Checks	medium
200508	SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2024:2019-1)	Nessus	SuSE Local Security Checks	critical
200462	SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2024:2008-1)	Nessus	SuSE Local Security Checks	critical
200363	Amazon Linux 2 : kernel (ALASKERNEL-5.15-2024-044)	Nessus	Amazon Linux Local Security Checks	medium

Detections

Analytics

CVE-2024-36938

medium

Tenable Plugins

critical

medium

critical

critical

medium