CVE-2024-40911: wifi: cfg80211: Lock wiphy in cfg80211_get_station
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Lock wiphy in cfg80211_get_station Wiphy should be locked before calling rdev_get_station() (see lockdep assert in ieee80211_get_station()). This fixes the following kernel NULL dereference: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000050 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000003001000 [0000000000000050] pgd=0800000002dca003, p4d=0800000002dca003, pud=08000000028e9003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] SMP Modules linked in: netconsole dwc3_meson_g12a dwc3_of_simple dwc3 ip_gre gre ath10k_pci ath10k_core ath9k ath9k_common ath9k_hw ath CPU: 0 PID: 1091 Comm: kworker/u8:0 Not tainted 6.4.0-02144-g565f9a3a7911-dirty #705 Hardware name: RPT (r1) (DT) Workqueue: bat_events batadv_v_elp_throughput_metric_update pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : ath10k_sta_statistics+0x10/0x2dc [ath10k_core] lr : sta_set_sinfo+0xcc/0xbd4 sp : ffff000007b43ad0 x29: ffff000007b43ad0 x28: ffff0000071fa900 x27: ffff00000294ca98 x26: ffff000006830880 x25: ffff000006830880 x24: ffff00000294c000 x23: 0000000000000001 x22: ffff000007b43c90 x21: ffff800008898acc x20: ffff00000294c6e8 x19: ffff000007b43c90 x18: 0000000000000000 x17: 445946354d552d78 x16: 62661f7200000000 x15: 57464f445946354d x14: 0000000000000000 x13: 00000000000000e3 x12: d5f0acbcebea978e x11: 00000000000000e3 x10: 000000010048fe41 x9 : 0000000000000000 x8 : ffff000007b43d90 x7 : 000000007a1e2125 x6 : 0000000000000000 x5 : ffff0000024e0900 x4 : ffff800000a0250c x3 : ffff000007b43c90 x2 : ffff00000294ca98 x1 : ffff000006831920 x0 : 0000000000000000 Call trace: ath10k_sta_statistics+0x10/0x2dc [ath10k_core] sta_set_sinfo+0xcc/0xbd4 ieee80211_get_station+0x2c/0x44 cfg80211_get_station+0x80/0x154 batadv_v_elp_get_throughput+0x138/0x1fc batadv_v_elp_throughput_metric_update+0x1c/0xa4 process_one_work+0x1ec/0x414 worker_thread+0x70/0x46c kthread+0xdc/0xe0 ret_from_fork+0x10/0x20 Code: a9bb7bfd 910003fd a90153f3 f9411c40 (f9402814) This happens because STA has time to disconnect and reconnect before batadv_v_elp_throughput_metric_update() delayed work gets scheduled. In this situation, ath10k_sta_state() can be in the middle of resetting arsta data when the work queue get chance to be scheduled and ends up accessing it. Locking wiphy prevents that.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.15.162 | 5.15.162 |
| redhat/kernel | <6.1.95 | 6.1.95 |
| redhat/kernel | <6.6.35 | 6.6.35 |
| redhat/kernel | <6.9.6 | 6.9.6 |
| redhat/kernel | <6.10 | 6.10 |
| Linux Kernel | >=3.16<5.15.162 | |
| Linux Kernel | >=5.16<6.1.95 | |
| Linux Kernel | >=6.2<6.6.35 | |
| Linux Kernel | >=6.7<6.9.6 | |
| Linux Kernel | =6.10-rc1 | |
| Linux Kernel | =6.10-rc2 | |
| debian/linux | <=5.10.223-1<=5.10.234-1 | 6.1.129-1 6.1.128-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2024:5928
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:7000
- https://bugzilla.redhat.com/show_bug.cgi?id=2297495
- https://git.kernel.org/stable/c/dfd84ce41663be9ca3f69bd657c45f49b69344d9
- https://git.kernel.org/stable/c/6d540b0317901535275020bd4ac44fac6439ca76
- https://git.kernel.org/stable/c/0ccc63958d8373e15a69f4f8069f3e78f7f3898a
- https://git.kernel.org/stable/c/43e1eefb0b2094e2281150d87d09e8bc872b9fba
- https://git.kernel.org/stable/c/642f89daa34567d02f312d03e41523a894906dae
- https://launchpad.net/bugs/cve/CVE-2024-40911
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40911
- https://nvd.nist.gov/vuln/detail/CVE-2024-40911
- https://security-tracker.debian.org/tracker/CVE-2024-40911
- https://ubuntu.com/security/CVE-2024-40911
- https://git.kernel.org/linus/642f89daa34567d02f312d03e41523a894906dae
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-40911?
CVE-2024-40911 has a moderate severity level due to the potential for kernel NULL dereference.
How do I fix CVE-2024-40911?
To fix CVE-2024-40911, update your Linux kernel to version 5.15.162, 6.1.95, 6.6.35, 6.9.6, 6.10, or higher as applicable.
Which systems are affected by CVE-2024-40911?
CVE-2024-40911 affects various versions of the Linux kernel, specifically those prior to 5.15.162, 6.1.95, 6.6.35, 6.9.6, and 6.10.
Is CVE-2024-40911 being exploited in the wild?
As of now, there are no public reports indicating that CVE-2024-40911 is actively being exploited in the wild.
What component of the Linux kernel does CVE-2024-40911 impact?
CVE-2024-40911 impacts the Wi-Fi subsystem specifically related to wiphy locking in the cfg80211 module.
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