CVE-2022-49869: bnxt_en: Fix possible crash in bnxt_hwrm_set_coal()
In the Linux kernel, the following vulnerability has been resolved:
bnxten: Fix possible crash in bnxthwrmsetcoal()
During the error recovery sequence, the rtnllock is not held for the entire duration and some datastructures may be freed during the sequence. Check for the BNXTSTATEOPEN flag instead of netifrunning() to ensure that the device is fully operational before proceeding to reconfigure the coalescing settings.
This will fix a possible crash like this:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 0 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 10 PID: 181276 Comm: ethtool Kdump: loaded Tainted: G IOE --------- - - 4.18.0-348.el8.x8664 #1 Hardware name: Dell Inc. PowerEdge R740/0F9N89, BIOS 2.3.10 08/15/2019 RIP: 0010:bnxthwrmsetcoal+0x1fb/0x2a0 [bnxten] Code: c2 66 83 4e 22 08 66 89 46 1c e8 10 cb 00 00 41 83 c6 01 44 39 b3 68 01 00 00 0f 8e a3 00 00 00 48 8b 93 c8 00 00 00 49 63 c6 <48> 8b 2c c2 48 8b 85 b8 02 00 00 48 85 c0 74 2e 48 8b 74 24 08 f6 RSP: 0018:ffffb11c8dcaba50 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8d168a8b0ac0 RCX: 00000000000000c5 RDX: 0000000000000000 RSI: ffff8d162f72c000 RDI: ffff8d168a8b0b28 RBP: 0000000000000000 R08: b6e1f68a12e9a7eb R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000037 R12: ffff8d168a8b109c R13: ffff8d168a8b10aa R14: 0000000000000000 R15: ffffffffc01ac4e0 FS: 00007f3852e4c740(0000) GS:ffff8d24c0080000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000041b3ee003 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: ethnlsetcoalesce+0x3ce/0x4c0 genlfamilyrcvmsgdoit.isra.15+0x10f/0x150 genlfamilyrcvmsg+0xb3/0x160 ? coalescefillreply+0x480/0x480 genlrcvmsg+0x47/0x90 ? genlfamilyrcvmsg+0x160/0x160 netlinkrcvskb+0x4c/0x120 genlrcv+0x24/0x40 netlinkunicast+0x196/0x230 netlinksendmsg+0x204/0x3d0 socksendmsg+0x4c/0x50 syssendto+0xee/0x160 ? syscalltraceenter+0x1d3/0x2c0 ? auditsyscallexit+0x249/0x2a0 x64syssendto+0x24/0x30 dosyscall64+0x5b/0x1a0 entrySYSCALL64afterhwframe+0x65/0xca RIP: 0033:0x7f38524163bb
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49869?
CVE-2022-49869 has been classified as a high-severity vulnerability due to its potential to cause system crashes.
How do I fix CVE-2022-49869?
To resolve CVE-2022-49869, it is recommended to update the Linux kernel to the latest patched version that addresses this issue.
What does CVE-2022-49869 affect?
CVE-2022-49869 affects the Linux kernel, specifically the bnxt_en component handling error recovery.
What are the risks of not addressing CVE-2022-49869?
Failure to address CVE-2022-49869 may result in unexpected system crashes and instability during the error recovery process.
Is CVE-2022-49869 being actively exploited?
As of now, there are no public reports of active exploitation of CVE-2022-49869, but it is still crucial to apply the necessary updates.