CVE-2024-43911

CVE Details

Release Date:

2024-08-26

Description

In the Linux kernel, the following vulnerability has been resolved:\nwifi: mac80211: fix NULL dereference at band check in starting tx ba session\nIn MLD connection, link_data/link_conf are dynamically allocated. They\ndon't point to vif->bss_conf. So, there will be no chanreq assigned to\nvif->bss_conf and then the chan will be NULL. Tweak the code to check\nht_supported/vht_supported/has_he/has_eht on sta deflink.\nCrash log (with rtw89 version under MLO development):\n[ 9890.526087] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[ 9890.526102] #PF: supervisor read access in kernel mode\n[ 9890.526105] #PF: error_code(0x0000) - not-present page\n[ 9890.526109] PGD 0 P4D 0\n[ 9890.526114] Oops: 0000 [#1] PREEMPT SMP PTI\n[ 9890.526119] CPU: 2 PID: 6367 Comm: kworker/u16:2 Kdump: loaded Tainted: G OE 6.9.0 #1\n[ 9890.526123] Hardware name: LENOVO 2356AD1/2356AD1, BIOS G7ETB3WW (2.73 ) 11/28/2018\n[ 9890.526126] Workqueue: phy2 rtw89_core_ba_work [rtw89_core]\n[ 9890.526203] RIP: 0010:ieee80211_start_tx_ba_session (net/mac80211/agg-tx.c:618 (discriminator 1)) mac80211\n[ 9890.526279] Code: f7 e8 d5 93 3e ea 48 83 c4 28 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 49 8b 84 24 e0 f1 ff ff 48 8b 80 90 1b 00 00 <83> 38 03 0f 84 37 fe ff ff bb ea ff ff ff eb cc 49 8b 84 24 10 f3\nAll code\n========\n0:f7 e8 imul %eax\n2:d5 (bad)\n3:93 xchg %eax,%ebx\n4:3e ea ds (bad)\n6:48 83 c4 28 add cve_9.RHSA-2024-9315-qa-prodx28,%rsp\na:89 d8 mov %ebx,%eax\nc:5b pop %rbx\nd:41 5c pop %r12\nf:41 5d pop %r13\n11:41 5e pop %r14\n13:41 5f pop %r15\n15:5d pop %rbp\n16:c3 retq\n17:cc int3\n18:cc int3\n19:cc int3\n1a:cc int3\n1b:49 8b 84 24 e0 f1 ff mov -0xe20(%r12),%rax\n22:ff\n23:48 8b 80 90 1b 00 00 mov 0x1b90(%rax),%rax\n2a:*83 38 03 cmpl cve_9.RHSA-2024-9315-qa-prodx3,(%rax)<-- trapping instruction\n2d:0f 84 37 fe ff ff je 0xfffffffffffffe6a\n33:bb ea ff ff ff mov cve_9.RHSA-2024-9315-qa-prodxffffffea,%ebx\n38:eb cc jmp 0x6\n3a:49 rex.WB\n3b:8b .byte 0x8b\n3c:84 24 10 test %ah,(%rax,%rdx,1)\n3f:f3 repz\nCode starting with the faulting instruction\n===========================================\n0:83 38 03 cmpl cve_9.RHSA-2024-9315-qa-prodx3,(%rax)\n3:0f 84 37 fe ff ff je 0xfffffffffffffe40\n9:bb ea ff ff ff mov cve_9.RHSA-2024-9315-qa-prodxffffffea,%ebx\ne:eb cc jmp 0xffffffffffffffdc\n10:49 rex.WB\n11:8b .byte 0x8b\n12:84 24 10 test %ah,(%rax,%rdx,1)\n15:f3 repz\n[ 9890.526285] RSP: 0018:ffffb8db09013d68 EFLAGS: 00010246\n[ 9890.526291] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff9308e0d656c8\n[ 9890.526295] RDX: 0000000000000000 RSI: ffffffffab99460b RDI: ffffffffab9a7685\n[ 9890.526300] RBP: ffffb8db09013db8 R08: 0000000000000000 R09: 0000000000000873\n[ 9890.526304] R10: ffff9308e0d64800 R11: 0000000000000002 R12: ffff9308e5ff6e70\n[ 9890.526308] R13: ffff930952500e20 R14: ffff9309192a8c00 R15: 0000000000000000\n[ 9890.526313] FS: 0000000000000000(0000) GS:ffff930b4e700000(0000) knlGS:0000000000000000\n[ 9890.526316] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 9890.526318] CR2: 0000000000000000 CR3: 0000000391c58005 CR4: 00000000001706f0\n[ 9890.526321] Call Trace:\n[ 9890.526324] \n[ 9890.526327] ? show_regs (arch/x86/kernel/dumpstack.c:479)\n[ 9890.526335] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\n[ 9890.526340] ? page_fault_oops (arch/x86/mm/fault.c:713)\n[ 9890.526347] ? search_module_extables (kernel/module/main.c:3256 (discriminator\n---truncated---

See more information about CVE-2024-43911 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.7	CVSS Vector:	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Adjacent network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14