CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-26957 – s390/zcrypt: fix reference counting on zcrypt card objects
https://notcve.org/view.php?id=CVE-2024-26957
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: fix reference counting on zcrypt card objects Tests with hot-plugging crytpo cards on KVM guests with debug kernel build revealed an use after free for the load field of the struct zcrypt_card. The reason was an incorrect reference handling of the zcrypt card object which could lead to a free of the zcrypt card object while it was still in use. This is an example of the slab message: kernel: 0x00000000885a7512-0x00000000885a7513 @offset=1298. First byte 0x68 instead of 0x6b kernel: Allocated in zcrypt_card_alloc+0x36/0x70 [zcrypt] age=18046 cpu=3 pid=43 kernel: kmalloc_trace+0x3f2/0x470 kernel: zcrypt_card_alloc+0x36/0x70 [zcrypt] kernel: zcrypt_cex4_card_probe+0x26/0x380 [zcrypt_cex4] kernel: ap_device_probe+0x15c/0x290 kernel: really_probe+0xd2/0x468 kernel: driver_probe_device+0x40/0xf0 kernel: __device_attach_driver+0xc0/0x140 kernel: bus_for_each_drv+0x8c/0xd0 kernel: __device_attach+0x114/0x198 kernel: bus_probe_device+0xb4/0xc8 kernel: device_add+0x4d2/0x6e0 kernel: ap_scan_adapter+0x3d0/0x7c0 kernel: ap_scan_bus+0x5a/0x3b0 kernel: ap_scan_bus_wq_callback+0x40/0x60 kernel: process_one_work+0x26e/0x620 kernel: worker_thread+0x21c/0x440 kernel: Freed in zcrypt_card_put+0x54/0x80 [zcrypt] age=9024 cpu=3 pid=43 kernel: kfree+0x37e/0x418 kernel: zcrypt_card_put+0x54/0x80 [zcrypt] kernel: ap_device_remove+0x4c/0xe0 kernel: device_release_driver_internal+0x1c4/0x270 kernel: bus_remove_device+0x100/0x188 kernel: device_del+0x164/0x3c0 kernel: device_unregister+0x30/0x90 kernel: ap_scan_adapter+0xc8/0x7c0 kernel: ap_scan_bus+0x5a/0x3b0 kernel: ap_scan_bus_wq_callback+0x40/0x60 kernel: process_one_work+0x26e/0x620 kernel: worker_thread+0x21c/0x440 kernel: kthread+0x150/0x168 kernel: __ret_from_fork+0x3c/0x58 kernel: ret_from_fork+0xa/0x30 kernel: Slab 0x00000372022169c0 objects=20 used=18 fp=0x00000000885a7c88 flags=0x3ffff00000000a00(workingset|slab|node=0|zone=1|lastcpupid=0x1ffff) kernel: Object 0x00000000885a74b8 @offset=1208 fp=0x00000000885a7c88 kernel: Redzone 00000000885a74b0: bb bb bb bb bb bb bb bb ........ kernel: Object 00000000885a74b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk kernel: Object 00000000885a74c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk kernel: Object 00000000885a74d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk kernel: Object 00000000885a74e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk kernel: Object 00000000885a74f8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk kernel: Object 00000000885a7508: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 68 4b 6b 6b 6b a5 kkkkkkkkkkhKkkk. kernel: Redzone 00000000885a7518: bb bb bb bb bb bb bb bb ........ kernel: Padding 00000000885a756c: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ kernel: CPU: 0 PID: 387 Comm: systemd-udevd Not tainted 6.8.0-HF #2 kernel: Hardware name: IBM 3931 A01 704 (KVM/Linux) kernel: Call Trace: kernel: [<00000000ca5ab5b8>] dump_stack_lvl+0x90/0x120 kernel: [<00000000c99d78bc>] check_bytes_and_report+0x114/0x140 kernel: [<00000000c99d53cc>] check_object+0x334/0x3f8 kernel: [<00000000c99d820c>] alloc_debug_processing+0xc4/0x1f8 kernel: [<00000000c99d852e>] get_partial_node.part.0+0x1ee/0x3e0 kernel: [<00000000c99d94ec>] ___slab_alloc+0xaf4/0x13c8 kernel: [<00000000c99d9e38>] __slab_alloc.constprop.0+0x78/0xb8 kernel: [<00000000c99dc8dc>] __kmalloc+0x434/0x590 kernel: [<00000000c9b4c0ce>] ext4_htree_store_dirent+0x4e/0x1c0 kernel: [<00000000c9b908a2>] htree_dirblock_to_tree+0x17a/0x3f0 kernel: ---truncated--- En el kernel de Linux, se resolvió la siguiente vulnerabilidad: s390/zcrypt: corrige el recuento de referencias en los objetos de la tarjeta zcrypt. Las pruebas con tarjetas crypto de conexión en caliente en invitados KVM con compilación del kernel de depuración revelaron un use after free el campo de carga de la estructura zcrypt_card . El motivo fue un manejo de referencia incorrecto del objeto de la tarjeta zcrypt que podría provocar la liberación del objeto de la tarjeta zcrypt mientras aún estaba en uso. • https://git.kernel.org/stable/c/7e500849fa558879a1cde43f80c7c048c2437058 https://git.kernel.org/stable/c/9daddee03de3f231012014dab8ab2b277a116a55 https://git.kernel.org/stable/c/6470078ab3d8f222115e11c4ec67351f3031b3dd https://git.kernel.org/stable/c/a55677878b93e9ebc31f66d0e2fb93be5e7836a6 https://git.kernel.org/stable/c/b7f6c3630eb3f103115ab0d7613588064f665d0d https://git.kernel.org/stable/c/a64ab862e84e3e698cd351a87cdb504c7fc575ca https://git.kernel.org/stable/c/befb7f889594d23e1b475720cf93efd2f77df000 https://git.kernel.org/stable/c/394b6d8bbdf9ddee6d5bcf3e1f3e9f23e • CWE-416: Use After Free •
CVSS: 5.5EPSS: 0%CPEs: 9EXPL: 0CVE-2024-26956 – nilfs2: fix failure to detect DAT corruption in btree and direct mappings
https://notcve.org/view.php?id=CVE-2024-26956
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix failure to detect DAT corruption in btree and direct mappings Patch series "nilfs2: fix kernel bug at submit_bh_wbc()". This resolves a kernel BUG reported by syzbot. Since there are two flaws involved, I've made each one a separate patch. The first patch alone resolves the syzbot-reported bug, but I think both fixes should be sent to stable, so I've tagged them as such. This patch (of 2): Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data to a nilfs2 file system whose metadata is corrupted. There are two flaws involved in this issue. The first flaw is that when nilfs_get_block() locates a data block using btree or direct mapping, if the disk address translation routine nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata corruption, it can be passed back to nilfs_get_block(). This causes nilfs_get_block() to misidentify an existing block as non-existent, causing both data block lookup and insertion to fail inconsistently. The second flaw is that nilfs_get_block() returns a successful status in this inconsistent state. This causes the caller __block_write_begin_int() or others to request a read even though the buffer is not mapped, resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc() failing. This fixes the first issue by changing the return value to code -EINVAL when a conversion using DAT fails with code -ENOENT, avoiding the conflicting condition that leads to the kernel bug described above. Here, code -EINVAL indicates that metadata corruption was detected during the block lookup, which will be properly handled as a file system error and converted to -EIO when passing through the nilfs2 bmap layer. • https://git.kernel.org/stable/c/c3a7abf06ce719a51139e62a034590be99abbc2c https://git.kernel.org/stable/c/b67189690eb4b7ecc84ae16fa1e880e0123eaa35 https://git.kernel.org/stable/c/9cbe1ad5f4354f4df1445e5f4883983328cd6d8e https://git.kernel.org/stable/c/c3b5c5c31e723b568f83d8cafab8629d9d830ffb https://git.kernel.org/stable/c/2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84 https://git.kernel.org/stable/c/46b832e09d43b394ac0f6d9485d2b1a06593f0b7 https://git.kernel.org/stable/c/f69e81396aea66304d214f175aa371f1b5578862 https://git.kernel.org/stable/c/a8e4d098de1c0f4c5c1f2ed4633a860f0 •
CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-26955 – nilfs2: prevent kernel bug at submit_bh_wbc()
https://notcve.org/view.php?id=CVE-2024-26955
In the Linux kernel, the following vulnerability has been resolved: nilfs2: prevent kernel bug at submit_bh_wbc() Fix a bug where nilfs_get_block() returns a successful status when searching and inserting the specified block both fail inconsistently. If this inconsistent behavior is not due to a previously fixed bug, then an unexpected race is occurring, so return a temporary error -EAGAIN instead. This prevents callers such as __block_write_begin_int() from requesting a read into a buffer that is not mapped, which would cause the BUG_ON check for the BH_Mapped flag in submit_bh_wbc() to fail. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: nilfs2: previene el error del kernel en submit_bh_wbc(). Se corrige un error por el cual nilfs_get_block() devuelve un estado exitoso cuando la búsqueda y la inserción del bloque especificado fallan de manera inconsistente. Si este comportamiento inconsistente no se debe a un error solucionado previamente, entonces se está produciendo una ejecución inesperada, por lo que se devuelve un error temporal -EAGAIN. • https://git.kernel.org/stable/c/1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b https://git.kernel.org/stable/c/91e4c4595fae5e87069e44687ae879091783c183 https://git.kernel.org/stable/c/32eaee72e96590a75445c8a6c7c1057673b47e07 https://git.kernel.org/stable/c/f0fe7ad5aff4f0fcf988913313c497de85f1e186 https://git.kernel.org/stable/c/ca581d237f3b8539c044205bb003de71d75d227c https://git.kernel.org/stable/c/192e9f9078c96be30b31c4b44d6294b24520fce5 https://git.kernel.org/stable/c/0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c https://git.kernel.org/stable/c/48d443d200237782dc82e6b60663ec414 •
CVSS: 5.5EPSS: 0%CPEs: 7EXPL: 0CVE-2024-26951 – wireguard: netlink: check for dangling peer via is_dead instead of empty list
https://notcve.org/view.php?id=CVE-2024-26951
In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: check for dangling peer via is_dead instead of empty list If all peers are removed via wg_peer_remove_all(), rather than setting peer_list to empty, the peer is added to a temporary list with a head on the stack of wg_peer_remove_all(). If a netlink dump is resumed and the cursored peer is one that has been removed via wg_peer_remove_all(), it will iterate from that peer and then attempt to dump freed peers. Fix this by instead checking peer->is_dead, which was explictly created for this purpose. Also move up the device_update_lock lockdep assertion, since reading is_dead relies on that. It can be reproduced by a small script like: echo "Setting config..." ip link add dev wg0 type wireguard wg setconf wg0 /big-config ( while true; do echo "Showing config..." wg showconf wg0 > /dev/null done ) & sleep 4 wg setconf wg0 <(printf "[Peer]\nPublicKey=$(wg genkey)\n") Resulting in: BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20 Read of size 8 at addr ffff88811956ec70 by task wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Call Trace: <TASK> dump_stack_lvl+0x47/0x70 print_address_description.constprop.0+0x2c/0x380 print_report+0xab/0x250 kasan_report+0xba/0xf0 __lock_acquire+0x182a/0x1b20 lock_acquire+0x191/0x4b0 down_read+0x80/0x440 get_peer+0x140/0xcb0 wg_get_device_dump+0x471/0x1130 En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wireguard: netlink: verifique si hay pares pendientes a través de is_dead en lugar de una lista vacía. • https://git.kernel.org/stable/c/e7096c131e5161fa3b8e52a650d7719d2857adfd https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87 https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04 https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c •
CVSS: 5.5EPSS: 0%CPEs: 7EXPL: 0CVE-2024-26950 – wireguard: netlink: access device through ctx instead of peer
https://notcve.org/view.php?id=CVE-2024-26950
In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: access device through ctx instead of peer The previous commit fixed a bug that led to a NULL peer->device being dereferenced. It's actually easier and faster performance-wise to instead get the device from ctx->wg. This semantically makes more sense too, since ctx->wg->peer_allowedips.seq is compared with ctx->allowedips_seq, basing them both in ctx. This also acts as a defence in depth provision against freed peers. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: wireguard: netlink: acceda al dispositivo a través de ctx en lugar de peer. el commit anterior solucionó un error que provocaba que se desreferenciara un dispositivo NULL peer->. • https://git.kernel.org/stable/c/e7096c131e5161fa3b8e52a650d7719d2857adfd https://git.kernel.org/stable/c/493aa6bdcffd90a4f82aa614fe4f4db0641b4068 https://git.kernel.org/stable/c/4be453271a882c8ebc28df3dbf9e4d95e6ac42f5 https://git.kernel.org/stable/c/09c3fa70f65175861ca948cb2f0f791e666c90e5 https://git.kernel.org/stable/c/c991567e6c638079304cc15dff28748e4a3c4a37 https://git.kernel.org/stable/c/93bcc1752c69bb309f4d8cfaf960ef1faeb34996 https://git.kernel.org/stable/c/d44bd323d8bb8031eef4bdc44547925998a11e47 https://git.kernel.org/stable/c/71cbd32e3db82ea4a74e3ef9aeeaa6971 •