CVE-2025-21974

In the Linux kernel, the following vulnerability has been resolved:

eth: bnxt: return fail if interface is down in bnxtqueuemem_alloc()

The bnxtqueuemem_alloc() is called to allocate new queue memory when a queue is restarted. It internally accesses rx buffer descriptor corresponding to the index. The rx buffer descriptor is allocated and set when the interface is up and it's freed when the interface is down. So, if queue is restarted if interface is down, kernel panic occurs.

Splat looks like: BUG: unable to handle page fault for address: 000000000000b240 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 3 UID: 0 PID: 1563 Comm: ncdevmem2 Not tainted 6.14.0-rc2+ #9 844ddba6e7c459cafd0bf4db9a3198e Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021 RIP: 0010:bnxtqueuememalloc+0x3f/0x4e0 [bnxten] Code: 41 54 4d 89 c4 4d 69 c0 c0 05 00 00 55 48 89 f5 53 48 89 fb 4c 8d b5 40 05 00 00 48 83 ec 15 RSP: 0018:ffff9dcc83fef9e8 EFLAGS: 00010202 RAX: ffffffffc0457720 RBX: ffff934ed8d40000 RCX: 0000000000000000 RDX: 000000000000001f RSI: ffff934ea508f800 RDI: ffff934ea508f808 RBP: ffff934ea508f800 R08: 000000000000b240 R09: ffff934e84f4b000 R10: ffff9dcc83fefa30 R11: ffff934e84f4b000 R12: 000000000000001f R13: ffff934ed8d40ac0 R14: ffff934ea508fd40 R15: ffff934e84f4b000 FS: 00007fa73888c740(0000) GS:ffff93559f780000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000b240 CR3: 0000000145a2e000 CR4: 00000000007506f0 PKRU: 55555554 Call Trace: <TASK> ? _die+0x20/0x70 ? pagefaultoops+0x15a/0x460 ? excpagefault+0x6e/0x180 ? asmexcpagefault+0x22/0x30 ? _pfxbnxtqueuememalloc+0x10/0x10 [bnxten 7f85e76f4d724ba07471d7e39d9e773aea6597b7] ? bnxtqueuememalloc+0x3f/0x4e0 [bnxten 7f85e76f4d724ba07471d7e39d9e773aea6597b7] netdevrxqueuerestart+0xc5/0x240 netdevmembinddmabuftoqueue+0xf8/0x200 netdevnlbindrxdoit+0x3a7/0x450 genlfamilyrcvmsgdoit+0xd9/0x130 genlrcvmsg+0x184/0x2b0 ? _pfxnetdevnlbindrxdoit+0x10/0x10 ? _pfxgenlrcvmsg+0x10/0x10 netlinkrcvskb+0x54/0x100 genlrcv+0x24/0x40 ...