发布于3月6日3月6日 Members Ubuntu: (CVE-2021-47468): linux vulnerability Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/22/2024 Created 11/21/2024 Added 11/19/2024 Modified 02/11/2025 Description In the Linux kernel, the following vulnerability has been resolved: isdn: mISDN: Fix sleeping function called from invalid context The driver can call card->isac.release() function from an atomic context. Fix this by calling this function after releasing the lock. The following log reveals it: [ 44.168226 ] BUG: sleeping function called from invalid context at kernel/workqueue.c:3018 [ 44.168941 ] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 5475, name: modprobe [ 44.169574 ] INFO: lockdep is turned off. [ 44.169899 ] irq event stamp: 0 [ 44.170160 ] hardirqs lastenabled at (0): [<0000000000000000>] 0x0 [ 44.170627 ] hardirqs last disabled at (0): [<ffffffff814209ed>] copy_process+0x132d/0x3e00 [ 44.171240 ] softirqs lastenabled at (0): [<ffffffff81420a1a>] copy_process+0x135a/0x3e00 [ 44.171852 ] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 44.172318 ] Preemption disabled at: [ 44.172320 ] [<ffffffffa009b0a9>] nj_release+0x69/0x500 [netjet] [ 44.174441 ] Call Trace: [ 44.174630 ]dump_stack_lvl+0xa8/0xd1 [ 44.174912 ]dump_stack+0x15/0x17 [ 44.175166 ]___might_sleep+0x3a2/0x510 [ 44.175459 ]? nj_release+0x69/0x500 [netjet] [ 44.175791 ]__might_sleep+0x82/0xe0 [ 44.176063 ]? start_flush_work+0x20/0x7b0 [ 44.176375 ]start_flush_work+0x33/0x7b0 [ 44.176672 ]? trace_irq_enable_rcuidle+0x85/0x170 [ 44.177034 ]? kasan_quarantine_put+0xaa/0x1f0 [ 44.177372 ]? kasan_quarantine_put+0xaa/0x1f0 [ 44.177711 ]__flush_work+0x11a/0x1a0 [ 44.177991 ]? flush_work+0x20/0x20 [ 44.178257 ]? lock_release+0x13c/0x8f0 [ 44.178550 ]? __kasan_check_write+0x14/0x20 [ 44.178872 ]? do_raw_spin_lock+0x148/0x360 [ 44.179187 ]? read_lock_is_recursive+0x20/0x20 [ 44.179530 ]? __kasan_check_read+0x11/0x20 [ 44.179846 ]? do_raw_spin_unlock+0x55/0x900 [ 44.180168 ]? ____kasan_slab_free+0x116/0x140 [ 44.180505 ]? _raw_spin_unlock_irqrestore+0x41/0x60 [ 44.180878 ]? skb_queue_purge+0x1a3/0x1c0 [ 44.181189 ]? kfree+0x13e/0x290 [ 44.181438 ]flush_work+0x17/0x20 [ 44.181695 ]mISDN_freedchannel+0xe8/0x100 [ 44.182006 ]isac_release+0x210/0x260 [mISDNipac] [ 44.182366 ]nj_release+0xf6/0x500 [netjet] [ 44.182685 ]nj_remove+0x48/0x70 [netjet] [ 44.182989 ]pci_device_remove+0xa9/0x250 Solution(s) ubuntu-upgrade-linux ubuntu-upgrade-linux-aws ubuntu-upgrade-linux-aws-5-4 ubuntu-upgrade-linux-aws-fips ubuntu-upgrade-linux-aws-hwe ubuntu-upgrade-linux-azure ubuntu-upgrade-linux-azure-4-15 ubuntu-upgrade-linux-azure-5-4 ubuntu-upgrade-linux-azure-fips ubuntu-upgrade-linux-bluefield ubuntu-upgrade-linux-fips ubuntu-upgrade-linux-gcp ubuntu-upgrade-linux-gcp-4-15 ubuntu-upgrade-linux-gcp-5-4 ubuntu-upgrade-linux-gcp-fips ubuntu-upgrade-linux-gkeop ubuntu-upgrade-linux-hwe ubuntu-upgrade-linux-hwe-5-4 ubuntu-upgrade-linux-ibm ubuntu-upgrade-linux-kvm ubuntu-upgrade-linux-oracle ubuntu-upgrade-linux-oracle-5-4 ubuntu-upgrade-linux-raspi ubuntu-upgrade-linux-raspi-5-4 References https://attackerkb.com/topics/cve-2021-47468 CVE - 2021-47468 https://git.kernel.org/linus/6510e80a0b81b5d814e3aea6297ba42f5e76f73c https://git.kernel.org/stable/c/37e4f57b22cc5ebb3f80cf0f74fdeb487f082367 https://git.kernel.org/stable/c/4054b869dc263228d30a4755800b78f0f2ba0c89 https://git.kernel.org/stable/c/6510e80a0b81b5d814e3aea6297ba42f5e76f73c https://git.kernel.org/stable/c/6f95c97e0f9d6eb39c3f2cb45e8fa4268d1b372b https://git.kernel.org/stable/c/9f591cbdbed3d7822b2bdba89b34a6d7b434317d https://git.kernel.org/stable/c/a5b34409d3fc52114c828be4adbc30744fa3258b https://git.kernel.org/stable/c/ef269a8808cb1759245a98a7fe16fceaebad894c https://git.kernel.org/stable/c/f5966ba53013149bcf94e1536644a958dd00a026 https://www.cve.org/CVERecord?id=CVE-2021-47468 View more
