Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: vxlan: Annotate FDB data races The 'used' and 'updated' fields in the FDB entry structure can be accessed concurrently by multiple threads, leading to reports such as [1]. Can be reproduced using [2]. Suppress these reports by annotating these accesses using READ_ONCE() / WRITE_ONCE(). [1] BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0: vxlan_xmit+0xb29/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2: vxlan_xmit+0xadf/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f Reported by Kernel Concurrency Sanitizer on: CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [2] #!/bin/bash set +H echo whitelist > /sys/kernel/debug/kcsan echo !vxlan_xmit > /sys/kernel/debug/kcsan ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1 bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1 taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q & taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d342894c5d2f8c7df194c793ec4059656e09ca31 before 02a33b1035a307453a1da6ce0a1bf3676be287d7; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before 87d076987a9ba106c83412fcd113656f71af05a1; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before e033da39fc6abbddab6c29624acef80757f273fa; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before 784b78295a3a58bf052339dd669e6e03710220d3; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before 13cba3f837903f7184d6e9b6137d5165ffe82a8f; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before a6644aeb8ddf196dec5f8e782293c36f065df4d7; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before 4eceb7eae6ea7c950384c34e6dbbe872c981935f; affected d342894c5d2f8c7df194c793ec4059656e09ca31 before f6205f8215f12a96518ac9469ff76294ae7bd612 |
| Linux / Linux | affected 3.7; unaffected 0 before 3.7; unaffected 5.4.294 through 5.4.*; unaffected 5.10.238 through 5.10.*; unaffected 5.15.185 through 5.15.*; unaffected 6.1.141 through 6.1.*; unaffected 6.6.93 through 6.6.*; unaffected 6.12.31 through 6.12.*; unaffected 6.14.9 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7
- https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1
- https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa
- https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3
- https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f
- https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7
- https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f
- https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612
ADP enrichment
No English description supplied.