Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix potential double free on mesh join While commit 6a01afcf8468 ("mac80211: mesh: Free ie data when leaving mesh") fixed a memory leak on mesh leave / teardown it introduced a potential memory corruption caused by a double free when rejoining the mesh: ieee80211_leave_mesh() -> kfree(sdata->u.mesh.ie); ... ieee80211_join_mesh() -> copy_mesh_setup() -> old_ie = ifmsh->ie; -> kfree(old_ie); This double free / kernel panics can be reproduced by using wpa_supplicant with an encrypted mesh (if set up without encryption via "iw" then ifmsh->ie is always NULL, which avoids this issue). And then calling: $ iw dev mesh0 mesh leave $ iw dev mesh0 mesh join my-mesh Note that typically these commands are not used / working when using wpa_supplicant. And it seems that wpa_supplicant or wpa_cli are going through a NETDEV_DOWN/NETDEV_UP cycle between a mesh leave and mesh join where the NETDEV_UP resets the mesh.ie to NULL via a memcpy of default_mesh_setup in cfg80211_netdev_notifier_call, which then avoids the memory corruption, too. The issue was first observed in an application which was not using wpa_supplicant but "Senf" instead, which implements its own calls to nl80211. Fixing the issue by removing the kfree()'ing of the mesh IE in the mesh join function and leaving it solely up to the mesh leave to free the mesh IE.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3212d6248faf0efce6b7a718e198feecce0eea05 before 615716af8644813355e014314a0bc1e961250f5a; affected 86e7d4cd2ed5f4b0188afce8199faffcf1ae7c7e before c1d9c3628ef0a0ca197595d0f9e01cd3b5dda186; affected 37bccfa89559a70c044b5ccde3c916a91388e14a before 273ebddc5fda2967492cb0b6cdd7d81cfb821b76; affected 3f15e3e62c80e180282f0cbc5559264e11c328b7 before 3bbd0000d012f92aec423b224784fbf0f7bf40f8; affected 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 before 5d3ff9542a40ce034416bca03864709540a36016; affected 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 before 12e407a8ef17623823fd0c066fbd7f103953d28d; affected 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 before 582d8c60c0c053684f7138875e8150d5749ffc17; affected 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 before 46bb87d40683337757a2f902fcd4244b32bb4e86; affected 6a01afcf8468d3ca2bd8bbb27503f60dcf643b20 before 4a2d4496e15ea5bb5c8e83b94ca8ca7fb045e7d3; affected 12e9cb1e7c93413112260991d094cfda712fdc97; affected 4f3193e08602462a806e8f53212e79c60a6f7488; affected 4.9.233 before 4.9.309; affected 4.14.192 before 4.14.274; affected 4.19.137 before 4.19.237; affected 5.4.56 before 5.4.188; affected 4.4.233 before 4.5; affected 5.7.13 before 5.8 |
| Linux / Linux | affected 5.8; unaffected 0 before 5.8; unaffected 4.9.309 through 4.9.*; unaffected 4.14.274 through 4.14.*; unaffected 4.19.237 through 4.19.*; unaffected 5.4.188 through 5.4.*; unaffected 5.10.109 through 5.10.*; unaffected 5.15.32 through 5.15.*; unaffected 5.16.18 through 5.16.*; unaffected 5.17.1 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/615716af8644813355e014314a0bc1e961250f5a
- https://git.kernel.org/stable/c/c1d9c3628ef0a0ca197595d0f9e01cd3b5dda186
- https://git.kernel.org/stable/c/273ebddc5fda2967492cb0b6cdd7d81cfb821b76
- https://git.kernel.org/stable/c/3bbd0000d012f92aec423b224784fbf0f7bf40f8
- https://git.kernel.org/stable/c/5d3ff9542a40ce034416bca03864709540a36016
- https://git.kernel.org/stable/c/12e407a8ef17623823fd0c066fbd7f103953d28d
- https://git.kernel.org/stable/c/582d8c60c0c053684f7138875e8150d5749ffc17
- https://git.kernel.org/stable/c/46bb87d40683337757a2f902fcd4244b32bb4e86
- https://git.kernel.org/stable/c/4a2d4496e15ea5bb5c8e83b94ca8ca7fb045e7d3
ADP enrichment
No English description supplied.
No references supplied.