Description

In the Linux kernel, the following vulnerability has been resolved: net: avoid potential underflow in qdisc_pkt_len_init() with UFO After commit 7c6d2ecbda83 ("net: be more gentle about silly gso requests coming from user") virtio_net_hdr_to_skb() had sanity check to detect malicious attempts from user space to cook a bad GSO packet. Then commit cf9acc90c80ec ("net: virtio_net_hdr_to_skb: count transport header in UFO") while fixing one issue, allowed user space to cook a GSO packet with the following characteristic : IPv4 SKB_GSO_UDP, gso_size=3, skb->len = 28. When this packet arrives in qdisc_pkt_len_init(), we end up with hdr_len = 28 (IPv4 header + UDP header), matching skb->len Then the following sets gso_segs to 0 : gso_segs = DIV_ROUND_UP(skb->len - hdr_len, shinfo->gso_size); Then later we set qdisc_skb_cb(skb)->pkt_len to back to zero :/ qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; This leads to the following crash in fq_codel [1] qdisc_pkt_len_init() is best effort, we only want an estimation of the bytes sent on the wire, not crashing the kernel. This patch is fixing this particular issue, a following one adds more sanity checks for another potential bug. [1] [ 70.724101] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 70.724561] #PF: supervisor read access in kernel mode [ 70.724561] #PF: error_code(0x0000) - not-present page [ 70.724561] PGD 10ac61067 P4D 10ac61067 PUD 107ee2067 PMD 0 [ 70.724561] Oops: Oops: 0000 [#1] SMP NOPTI [ 70.724561] CPU: 11 UID: 0 PID: 2163 Comm: b358537762 Not tainted 6.11.0-virtme #991 [ 70.724561] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 70.724561] RIP: 0010:fq_codel_enqueue (net/sched/sch_fq_codel.c:120 net/sched/sch_fq_codel.c:168 net/sched/sch_fq_codel.c:230) sch_fq_codel [ 70.724561] Code: 24 08 49 c1 e1 06 44 89 7c 24 18 45 31 ed 45 31 c0 31 ff 89 44 24 14 4c 03 8b 90 01 00 00 eb 04 39 ca 73 37 4d 8b 39 83 c7 01 <49> 8b 17 49 89 11 41 8b 57 28 45 8b 5f 34 49 c7 07 00 00 00 00 49 All code ======== 0: 24 08 and $0x8,%al 2: 49 c1 e1 06 shl $0x6,%r9 6: 44 89 7c 24 18 mov %r15d,0x18(%rsp) b: 45 31 ed xor %r13d,%r13d e: 45 31 c0 xor %r8d,%r8d 11: 31 ff xor %edi,%edi 13: 89 44 24 14 mov %eax,0x14(%rsp) 17: 4c 03 8b 90 01 00 00 add 0x190(%rbx),%r9 1e: eb 04 jmp 0x24 20: 39 ca cmp %ecx,%edx 22: 73 37 jae 0x5b 24: 4d 8b 39 mov (%r9),%r15 27: 83 c7 01 add $0x1,%edi 2a:* 49 8b 17 mov (%r15),%rdx <-- trapping instruction 2d: 49 89 11 mov %rdx,(%r9) 30: 41 8b 57 28 mov 0x28(%r15),%edx 34: 45 8b 5f 34 mov 0x34(%r15),%r11d 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB Code starting with the faulting instruction =========================================== 0: 49 8b 17 mov (%r15),%rdx 3: 49 89 11 mov %rdx,(%r9) 6: 41 8b 57 28 mov 0x28(%r15),%edx a: 45 8b 5f 34 mov 0x34(%r15),%r11d e: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 15: 49 rex.WB [ 70.724561] RSP: 0018:ffff95ae85e6fb90 EFLAGS: 00000202 [ 70.724561] RAX: 0000000002000000 RBX: ffff95ae841de000 RCX: 0000000000000000 [ 70.724561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 [ 70.724561] RBP: ffff95ae85e6fbf8 R08: 0000000000000000 R09: ffff95b710a30000 [ 70.724561] R10: 0000000000000000 R11: bdf289445ce31881 R12: ffff95ae85e6fc58 [ 70.724561] R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000000 [ 70.724561] FS: 000000002c5c1380(0000) GS:ffff95bd7fcc0000(0000) knlGS:0000000000000000 [ 70.724561] CS: 0010 DS: 0000 ES: 0000 C ---truncated---

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  5.5 MEDIUM

Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

Hyperlink	Resource
https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d	Patch
https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1	Patch
https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b	Patch
https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c	Patch
https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c	Patch
https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1	Patch
https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174	Patch
https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72	Patch
https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	NIST

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

3 change records found show changes

Initial Analysis by NIST 11/12/2024 4:03:59 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 1034 characters. View Entire Change Record OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14.256 up to (excluding) 4.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19.218 up to (excluding) 5.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.162 up to (excluding) 5.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.82 up to (excluding) 5.10.227 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-476
Changed	Reference Type	https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d No Types Assigned	https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d Patch
Changed	Reference Type	https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1 No Types Assigned	https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b No Types Assigned	https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b Patch
Changed	Reference Type	https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c No Types Assigned	https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c Patch
Changed	Reference Type	https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c No Types Assigned	https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c Patch
Changed	Reference Type	https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1 No Types Assigned	https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174 No Types Assigned	https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72 No Types Assigned	https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac No Types Assigned	https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac Patch

CVE Modified by kernel.org 11/08/2024 11:15:33 AM

Action	Type	Old Value	New Value
Added	Reference		kernel.org https://git.kernel.org/stable/c/1598d70ad9c7d0a4d9d54b82094e9f45908fda6d [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/d70ca7598943572d5e384227bd268acb5109bf72 [No types assigned]

New CVE Received by NIST 10/21/2024 2:15:16 PM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 3998 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: net: avoid potential underflow in qdisc_pkt_len_init() with UFO After commit 7c6d2ecbda83 ("net: be more gentle about silly gso requests coming from user") virtio_net_hdr_to_skb() had sanity check to detect malicious attempts from user space to cook a bad GSO packet. Then commit cf9acc90c80ec ("net: virtio_net_hdr_to_skb: count transport header in UFO") while fixing one issue, allowed user space to cook a GSO packet with the
Added	Reference		kernel.org https://git.kernel.org/stable/c/25ab0b87dbd89cecef8a9c60a02bb97832e471d1 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/81fd007dcd47c34471766249853e4d4bce8eea4b [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/939c88cbdc668dadd8cfa7a35d9066331239041c [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/ba26060a29d3ca1bfc737aa79f7125128f35147c [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/c20029db28399ecc50e556964eaba75c43b1e2f1 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/d6114993e0a89fde84a60a60a8329a571580b174 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/f959cce8a2a04ce776aa8b78e83ce339e0d7fbac [No types assigned]