Description

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

ksmbd: fix global oob in ksmbd_nl_policy

Similar to a reported issue (check the commit b33fb5b801c6 ("net:
qualcomm: rmnet: fix global oob in rmnet_policy"), my local fuzzer finds
another global out-of-bounds read for policy ksmbd_nl_policy. See bug
trace below:

==================================================================
BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:386 [inline]
BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600
Read of size 1 at addr ffffffff8f24b100 by task syz-executor.1/62810

CPU: 0 PID: 62810 Comm: syz-executor.1 Tainted: G N 6.1.0 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
Call Trace:

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x172/0x475 mm/kasan/report.c:395
kasan_report+0xbb/0x1c0 mm/kasan/report.c:495
validate_nla lib/nlattr.c:386 [inline]
__nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600
__nla_parse+0x3e/0x50 lib/nlattr.c:697
__nlmsg_parse include/net/netlink.h:748 [inline]
genl_family_rcv_msg_attrs_parse.constprop.0+0x1b0/0x290 net/netlink/genetlink.c:565
genl_family_rcv_msg_doit+0xda/0x330 net/netlink/genetlink.c:734
genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
genl_rcv_msg+0x441/0x780 net/netlink/genetlink.c...

Classification

CVE ID: CVE-2024-26608

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.83% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/aaa1f1a2ee80888c12ae2783f3a0be10e14067c5
https://git.kernel.org/stable/c/2c939c74ef0b74e99b92e32edc2a59f9b9ca3d5a
https://git.kernel.org/stable/c/9863a53100f47652755545c2bd43e14a1855104d
https://git.kernel.org/stable/c/6993328a4cd62a24df254b587c0796a4a1eecc95
https://git.kernel.org/stable/c/ebeae8adf89d9a82359f6659b1663d09beec2faa

Timeline