CVE-2024-26596
published 2024-02-23CVE-2024-26596: In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events After the…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.24%
15.7th percentile
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
After the blamed commit, we started doing this dereference for every
NETDEV_CHANGEUPPER and NETDEV_PRECHANGEUPPER event in the system.
static inline struct dsa_port *dsa_user_to_port(const struct net_device *dev)
{
struct dsa_user_priv *p = netdev_priv(dev);
return p->dp;
}
Which is obviously bogus, because not all net_devices have a netdev_priv()
of type struct dsa_user_priv. But struct dsa_user_priv is fairly small,
and p->dp means dereferencing 8 bytes starting with offset 16. Most
drivers allocate that much private memory anyway, making our access not
fault, and we discard the bogus data quickly afterwards, so this wasn't
caught.
But the dummy interface is somewhat special in that it calls
alloc_netdev() with a priv size of 0. So every netdev_priv() dereference
is invalid, and we get this when we emit a NETDEV_PRECHANGEUPPER event
with a VLAN as its new upper:
$ ip link add dummy1 type dummy
$ ip link add link dummy1 name dummy1.100 type vlan id 100
[ 43.309174] ==================================================================
[ 43.316456] BUG: KASAN: slab-out-of-bounds in dsa_user_prechangeupper+0x30/0xe8
[ 43.323835] Read of size 8 at addr ffff3f86481d2990 by task ip/374
[ 43.330058]
[ 43.342436] Call trace:
[ 43.366542] dsa_user_prechangeupper+0x30/0xe8
[ 43.371024] dsa_user_netdevice_event+0xb38/0xee8
[ 43.375768] notifier_call_chain+0xa4/0x210
[ 43.379985] raw_notifier_call_chain+0x24/0x38
[ 43.384464] __netdev_upper_dev_link+0x3ec/0x5d8
[ 43.389120] netdev_upper_dev_link+0x70/0xa8
[ 43.393424] register_vlan_dev+0x1bc/0x310
[ 43.397554] vlan_newlink+0x210/0x248
[ 43.401247] rtnl_newlink+0x9fc/0xe30
[ 43.404942] rtnetlink_rcv_msg+0x378/0x580
Avoid the kernel oops by dereferencing after the type check, as customary.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.129-1 (bookworm) | linux 6.1.129-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.129-1 (bookworm) | linux 6.1.129-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 4c3f80d22b2eca911143ce656fa45c4699ff5bf4 < 9e9953f5e4d6d11a9dad56fdee307bb923302809 | 9e9953f5e4d6d11a9dad56fdee307bb923302809 |
| linux | linux | >= 4c3f80d22b2eca911143ce656fa45c4699ff5bf4 < 69a1e2d938dbbfcff0e064269adf60ad26dbb102 | 69a1e2d938dbbfcff0e064269adf60ad26dbb102 |
| linux | linux | >= 4c3f80d22b2eca911143ce656fa45c4699ff5bf4 < dbd909c20c11f0d29c0054d41e0d1f668a60e8c8 | dbd909c20c11f0d29c0054d41e0d1f668a60e8c8 |
| linux | linux | >= 4c3f80d22b2eca911143ce656fa45c4699ff5bf4 < 844f104790bd69c2e4dbb9ee3eba46fde1fcea7b | 844f104790bd69c2e4dbb9ee3eba46fde1fcea7b |
| linux | linux_kernel | >= 0 < 6.1.129-1 | 6.1.129-1 |
| linux | linux_kernel | >= 0 < 6.7.7-1 | 6.7.7-1 |
| linux | linux_kernel | >= 0 < 6.7.7-1 | 6.7.7-1 |
| linux | linux_kernel | >= 6.1.0 < 6.7.2 | 6.7.2 |
| msrc | azl3_kernel_6.6.57.1-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.92.2-1_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
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CISA ICS
Siemens SIMATIC S7-1500 CPU Family
cisa_ics·2025-06-12
Siemens SIMATIC S7-1500 CPU Family
ICS Advisory
##
Siemens SIMATIC S7-1500 CPU Family
Release DateJune 12, 2025
Alert CodeICSA-25-162-05
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens' ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
View CSAF
## 1. EXECUTIVE SUMMARY
- CVSS v4 8.7
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: SIMATIC S7-1500 CPU family
- Vulnerabilities: Missing Encryption of Sensitive Data, Out-of-bounds Read, Use After Free, Stack-
Microsoft
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
vendor_msrc·2024-02-13·CVSS 5.5
CVE-2024-26596 [MEDIUM] net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Debian
CVE-2024-26596: linux - In the Linux kernel, the following vulnerability has been resolved: net: dsa: f...
vendor_debian·2024·CVSS 5.5
CVE-2024-26596 [MEDIUM] CVE-2024-26596: linux - In the Linux kernel, the following vulnerability has been resolved: net: dsa: f...
In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events After the blamed commit, we started doing this dereference for every NETDEV_CHANGEUPPER and NETDEV_PRECHANGEUPPER event in the system. static inline struct dsa_port *dsa_user_to_port(const struct net_device *dev) { struct dsa_user_priv *p = netdev_priv(dev); return p->dp; } Which is obviously bogus, because not all net_devices have a netdev_priv() of type struct dsa_user_priv. But struct dsa_user_priv is fairly small, and p->dp means dereferencing 8 bytes starting with offset 16. Most drivers allocate that much private memory anyway, making our access not fault, and we discard the bogus data quickly afterwards, so this wasn't caught. But the d
GHSA
GHSA-3g6v-v5hj-c234: In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
ghsa_unreviewed·2024-02-23
CVE-2024-26596 [MEDIUM] GHSA-3g6v-v5hj-c234: In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
After the blamed commit, we started doing this dereference for every
NETDEV_CHANGEUPPER and NETDEV_PRECHANGEUPPER event in the system.
static inline struct dsa_port *dsa_user_to_port(const struct net_device *dev)
{
struct dsa_user_priv *p = netdev_priv(dev);
return p->dp;
}
Which is obviously bogus, because not all net_devices have a netdev_priv()
of type struct dsa_user_priv. But struct dsa_user_priv is fairly small,
and p->dp means dereferencing 8 bytes starting with offset 16. Most
drivers allocate that much private memory anyway, making our access not
fault, and we discard the bogus data quickly afterwards, so this wasn't
caught.
But
OSV
CVE-2024-26596: In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events A
osv·2024-02-23·CVSS 5.5
CVE-2024-26596 [MEDIUM] CVE-2024-26596: In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events A
In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events After the blamed commit, we started doing this dereference for every NETDEV_CHANGEUPPER and NETDEV_PRECHANGEUPPER event in the system. static inline struct dsa_port *dsa_user_to_port(const struct net_device *dev) { struct dsa_user_priv *p = netdev_priv(dev); return p->dp; } Which is obviously bogus, because not all net_devices have a netdev_priv() of type struct dsa_user_priv. But struct dsa_user_priv is fairly small, and p->dp means dereferencing 8 bytes starting with offset 16. Most drivers allocate that much private memory anyway, making our access not fault, and we discard the bogus data quickly afterwards, so this wasn't caught. But the d
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://git.kernel.org/stable/c/69a1e2d938dbbfcff0e064269adf60ad26dbb102https://git.kernel.org/stable/c/844f104790bd69c2e4dbb9ee3eba46fde1fcea7bhttps://git.kernel.org/stable/c/9e9953f5e4d6d11a9dad56fdee307bb923302809https://git.kernel.org/stable/c/dbd909c20c11f0d29c0054d41e0d1f668a60e8c8https://git.kernel.org/stable/c/844f104790bd69c2e4dbb9ee3eba46fde1fcea7bhttps://git.kernel.org/stable/c/dbd909c20c11f0d29c0054d41e0d1f668a60e8c8https://lists.debian.org/debian-lts-announce/2025/03/msg00028.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
2024-02-23
Published