CVE-2024-26961: mac802154: fix llsec key resources release in mac802154_llsec_key_del
First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mac802154: fix llsec key resources release in mac802154_llsec_key_del mac802154_llsec_key_del() can free resources of a key directly without following the RCU rules for waiting before the end of a grace period. This may lead to use-after-free in case llsec_lookup_key() is traversing the list of keys in parallel with a key deletion: refcount_t: addition on 0; use-after-free. WARNING: CPU: 4 PID: 16000 at lib/refcount.c:25 refcount_warn_saturate+0x162/0x2a0 Modules linked in: CPU: 4 PID: 16000 Comm: wpan-ping Not tainted 6.7.0 #19 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x162/0x2a0 Call Trace: <TASK> llsec_lookup_key.isra.0+0x890/0x9e0 mac802154_llsec_encrypt+0x30c/0x9c0 ieee802154_subif_start_xmit+0x24/0x1e0 dev_hard_start_xmit+0x13e/0x690 sch_direct_xmit+0x2ae/0xbc0 __dev_queue_xmit+0x11dd/0x3c20 dgram_sendmsg+0x90b/0xd60 __sys_sendto+0x466/0x4c0 __x64_sys_sendto+0xe0/0x1c0 do_syscall_64+0x45/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 Also, ieee802154_llsec_key_entry structures are not freed by mac802154_llsec_key_del(): unreferenced object 0xffff8880613b6980 (size 64): comm "iwpan", pid 2176, jiffies 4294761134 (age 60.475s) hex dump (first 32 bytes): 78 0d 8f 18 80 88 ff ff 22 01 00 00 00 00 ad de x......."....... 00 00 00 00 00 00 00 00 03 00 cd ab 00 00 00 00 ................ backtrace: [<ffffffff81dcfa62>] __kmem_cache_alloc_node+0x1e2/0x2d0 [<ffffffff81c43865>] kmalloc_trace+0x25/0xc0 [<ffffffff88968b09>] mac802154_llsec_key_add+0xac9/0xcf0 [<ffffffff8896e41a>] ieee802154_add_llsec_key+0x5a/0x80 [<ffffffff8892adc6>] nl802154_add_llsec_key+0x426/0x5b0 [<ffffffff86ff293e>] genl_family_rcv_msg_doit+0x1fe/0x2f0 [<ffffffff86ff46d1>] genl_rcv_msg+0x531/0x7d0 [<ffffffff86fee7a9>] netlink_rcv_skb+0x169/0x440 [<ffffffff86ff1d88>] genl_rcv+0x28/0x40 [<ffffffff86fec15c>] netlink_unicast+0x53c/0x820 [<ffffffff86fecd8b>] netlink_sendmsg+0x93b/0xe60 [<ffffffff86b91b35>] ____sys_sendmsg+0xac5/0xca0 [<ffffffff86b9c3dd>] ___sys_sendmsg+0x11d/0x1c0 [<ffffffff86b9c65a>] __sys_sendmsg+0xfa/0x1d0 [<ffffffff88eadbf5>] do_syscall_64+0x45/0xf0 [<ffffffff890000ea>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 Handle the proper resource release in the RCU callback function mac802154_llsec_key_del_rcu(). Note that if llsec_lookup_key() finds a key, it gets a refcount via llsec_key_get() and locally copies key id from key_entry (which is a list element). So it's safe to call llsec_key_put() and free the list entry after the RCU grace period elapses. Found by Linux Verification Center (linuxtesting.org).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10.215 | 5.10.215 |
| redhat/kernel | <5.15.154 | 5.15.154 |
| redhat/kernel | <6.1.84 | 6.1.84 |
| redhat/kernel | <6.6.24 | 6.6.24 |
| redhat/kernel | <6.7.12 | 6.7.12 |
| redhat/kernel | <6.8.3 | 6.8.3 |
| redhat/kernel | <6.9 | 6.9 |
| Linux Linux kernel | >=3.16<5.10.215 | |
| Linux Linux kernel | >=5.11<5.15.154 | |
| Linux Linux kernel | >=5.16<6.1.84 | |
| Linux Linux kernel | >=6.2<6.6.24 | |
| Linux Linux kernel | >=6.7<6.7.12 | |
| Linux Linux kernel | >=6.8<6.8.3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/068ab2759bc0b4daf0b964de61b2731449c86531
- https://git.kernel.org/stable/c/20d3e1c8a1847497269f04d874b2a5818ec29e2d
- https://git.kernel.org/stable/c/49c8951680d7b76fceaee89dcfbab1363fb24fd1
- https://git.kernel.org/stable/c/640297c3e897bd7e1481466a6a5cb9560f1edb88
- https://git.kernel.org/stable/c/d3d858650933d44ac12c1f31337e7110c2071821
- https://git.kernel.org/stable/c/dcd51ab42b7a0431575689c5f74b8b6efd45fc2f
- https://git.kernel.org/stable/c/e8a1e58345cf40b7b272e08ac7b32328b2543e40
- https://launchpad.net/bugs/cve/CVE-2024-26961
- https://access.redhat.com/security/cve/CVE-2024-26961
- https://lore.kernel.org/linux-cve-announce/2024050129-CVE-2024-26961-408d@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2278177
- https://access.redhat.com/errata/RHSA-2024:5065
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:8614
- https://access.redhat.com/errata/RHSA-2024:8613
- https://access.redhat.com/errata/RHSA-2024:8617
- https://access.redhat.com/errata/RHSA-2024:10262
- https://bugzilla.redhat.com/show_bug.cgi?id=2278176
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26961
- https://nvd.nist.gov/vuln/detail/CVE-2024-26961
- https://security-tracker.debian.org/tracker/CVE-2024-26961
- https://ubuntu.com/security/CVE-2024-26961
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://git.kernel.org/linus/e8a1e58345cf40b7b272e08ac7b32328b2543e40
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