CVE-2025-68353
Description
In the Linux kernel, the following vulnerability has been resolved: net: vxlan: prevent NULL deref in vxlan_xmit_one Neither sock4 nor sock6 pointers are guaranteed to be non-NULL in vxlan_xmit_one, e.g. if the iface is brought down. This can lead to the following NULL dereference: BUG: kernel NULL pointer dereference, address: 0000000000000010 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:vxlan_xmit_one+0xbb3/0x1580 Call Trace: vxlan_xmit+0x429/0x610 dev_hard_start_xmit+0x55/0xa0 __dev_queue_xmit+0x6d0/0x7f0 ip_finish_output2+0x24b/0x590 ip_output+0x63/0x110 Mentioned commits changed the code path in vxlan_xmit_one and as a side effect the sock4/6 pointer validity checks in vxlan(6)_get_route were lost. Fix this by adding back checks. Since both commits being fixed were released in the same version (v6.7) and are strongly related, bundle the fixes in a single commit.
How to fix
- Linux Linux333deb6b43c11d5bce00463b364ac993d2fa02a6, 4ac26aafdc8c7271414e2e7c0b2cb266a26591bc, 1f73a56f986005f0bc64ed23873930e2ee4f5911 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6f19b2c136d98a84d79030b53e23d405edfdc783 ≤ v < 333deb6b43c11d5bce00463b364ac993d2fa02a6, 6f19b2c136d98a84d79030b53e23d405edfdc783 ≤ v < 4ac26aafdc8c7271414e2e7c0b2cb266a26591bc, 6f19b2c136d98a84d79030b53e23d405edfdc783 ≤ v < 1f73a56f986005f0bc64ed23873930e2ee4f5911, 6.7 | 333deb6b43c11d5bce00463b364ac993d2fa02a6, 4ac26aafdc8c7271414e2e7c0b2cb266a26591bc, 1f73a56f986005f0bc64ed23873930e2ee4f5911 |
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