Security Vulnerabilities - CVEs Published In September 2024
In the Linux kernel, the following vulnerability has been resolved:
libfs: fix get_stashed_dentry()
get_stashed_dentry() tries to optimistically retrieve a stashed dentry
from a provided location. It needs to ensure to hold rcu lock before it
dereference the stashed location to prevent UAF issues. Use
rcu_dereference() instead of READ_ONCE() it's effectively equivalent
with some lockdep bells and whistles and it communicates clearly that
this expects rcu protection.
CVSS Score
7.8
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: Remove proc entry when dev is unregistered.
syzkaller reported a warning in bcm_connect() below. [0]
The repro calls connect() to vxcan1, removes vxcan1, and calls
connect() with ifindex == 0.
Calling connect() for a BCM socket allocates a proc entry.
Then, bcm_sk(sk)->bound is set to 1 to prevent further connect().
However, removing the bound device resets bcm_sk(sk)->bound to 0
in bcm_notify().
The 2nd connect() tries to allocate a proc entry with the same
name and sets NULL to bcm_sk(sk)->bcm_proc_read, leaking the
original proc entry.
Since the proc entry is available only for connect()ed sockets,
let's clean up the entry when the bound netdev is unregistered.
[0]:
proc_dir_entry 'can-bcm/2456' already registered
WARNING: CPU: 1 PID: 394 at fs/proc/generic.c:376 proc_register+0x645/0x8f0 fs/proc/generic.c:375
Modules linked in:
CPU: 1 PID: 394 Comm: syz-executor403 Not tainted 6.10.0-rc7-g852e42cc2dd4
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
RIP: 0010:proc_register+0x645/0x8f0 fs/proc/generic.c:375
Code: 00 00 00 00 00 48 85 ed 0f 85 97 02 00 00 4d 85 f6 0f 85 9f 02 00 00 48 c7 c7 9b cb cf 87 48 89 de 4c 89 fa e8 1c 6f eb fe 90 <0f> 0b 90 90 48 c7 c7 98 37 99 89 e8 cb 7e 22 05 bb 00 00 00 10 48
RSP: 0018:ffa0000000cd7c30 EFLAGS: 00010246
RAX: 9e129be1950f0200 RBX: ff1100011b51582c RCX: ff1100011857cd80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffd400000000000f R09: ff1100013e78cac0
R10: ffac800000cd7980 R11: ff1100013e12b1f0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ff1100011a99a2ec
FS: 00007fbd7086f740(0000) GS:ff1100013fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200071c0 CR3: 0000000118556004 CR4: 0000000000771ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
proc_create_net_single+0x144/0x210 fs/proc/proc_net.c:220
bcm_connect+0x472/0x840 net/can/bcm.c:1673
__sys_connect_file net/socket.c:2049 [inline]
__sys_connect+0x5d2/0x690 net/socket.c:2066
__do_sys_connect net/socket.c:2076 [inline]
__se_sys_connect net/socket.c:2073 [inline]
__x64_sys_connect+0x8f/0x100 net/socket.c:2073
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd9/0x1c0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fbd708b0e5d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48
RSP: 002b:00007fff8cd33f08 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbd708b0e5d
RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000040 R09: 0000000000000040
R10: 0000000000000040 R11: 0000000000000246 R12: 00007fff8cd34098
R13: 0000000000401280 R14: 0000000000406de8 R15: 00007fbd70ab9000
</TASK>
remove_proc_entry: removing non-empty directory 'net/can-bcm', leaking at least '2456'
CVSS Score
7.8
EPSS Score
0.003
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Check denominator crb_pipes before used
[WHAT & HOW]
A denominator cannot be 0, and is checked before used.
This fixes 2 DIVIDE_BY_ZERO issues reported by Coverity.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Check denominator pbn_div before used
[WHAT & HOW]
A denominator cannot be 0, and is checked before used.
This fixes 1 DIVIDE_BY_ZERO issue reported by Coverity.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()
Smatch warns:
arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential
spectre issue 'args.args' [r] (local cap)
The 'nargs' and 'nret' locals come directly from a user-supplied
buffer and are used as indexes into a small stack-based array and as
inputs to copy_to_user() after they are subject to bounds checks.
Use array_index_nospec() after the bounds checks to clamp these values
for speculative execution.
CVSS Score
7.1
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Validate function returns
[WHAT & HOW]
Function return values must be checked before data can be used
in subsequent functions.
This fixes 4 CHECKED_RETURN issues reported by Coverity.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Run DC_LOG_DC after checking link->link_enc
[WHAT]
The DC_LOG_DC should be run after link->link_enc is checked, not before.
This fixes 1 REVERSE_INULL issue reported by Coverity.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
udf: Avoid excessive partition lengths
Avoid mounting filesystems where the partition would overflow the
32-bits used for block number. Also refuse to mount filesystems where
the partition length is so large we cannot safely index bits in a
block bitmap.
CVSS Score
7.8
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Check UnboundedRequestEnabled's value
CalculateSwathAndDETConfiguration_params_st's UnboundedRequestEnabled
is a pointer (i.e. dml_bool_t *UnboundedRequestEnabled), and thus
if (p->UnboundedRequestEnabled) checks its address, not bool value.
This fixes 1 REVERSE_INULL issue reported by Coverity.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18
In the Linux kernel, the following vulnerability has been resolved:
drm/imagination: Free pvr_vm_gpuva after unlink
This caused a measurable memory leak. Although the individual
allocations are small, the leaks occurs in a high-usage codepath
(remapping or unmapping device memory) so they add up quickly.
CVSS Score
5.5
EPSS Score
0.002
Published
2024-09-18