CVE-2023-53531

Scores

EPSS

0.000none0.0%

0%20%40%60%80%100%

Percentile: 0.0%

Description

In the Linux kernel, the following vulnerability has been resolved: null_blk: fix poll request timeout handling When doing io_uring benchmark on /dev/nullb0, it’s easy to crash the kernel if poll requests timeout triggered, as reported by David. [1] BUG: kernel NULL pointer dereference, address: 0000000000000008 Workqueue: kblockd blk_mq_timeout_work RIP: 0010:null_timeout_rq+0x4e/0x91 Call Trace: ? null_timeout_rq+0x4e/0x91 blk_mq_handle_expired+0x31/0x4b bt_iter+0x68/0x84 ? bt_tags_iter+0x81/0x81 __sbitmap_for_each_set.constprop.0+0xb0/0xf2 ? __blk_mq_complete_request_remote+0xf/0xf bt_for_each+0x46/0x64 ? __blk_mq_complete_request_remote+0xf/0xf ? percpu_ref_get_many+0xc/0x2a blk_mq_queue_tag_busy_iter+0x14d/0x18e blk_mq_timeout_work+0x95/0x127 process_one_work+0x185/0x263 worker_thread+0x1b5/0x227 This is indeed a race problem between null_timeout_rq() and null_poll(). null_poll() null_timeout_rq() spin_lock(&nq->poll_lock) list_splice_init(&nq->poll_list, &list) spin_unlock(&nq->poll_lock) while (!list_empty(&list)) req = list_first_entry() list_del_init() … blk_mq_add_to_batch() // req->rq_next = NULL spin_lock(&nq->poll_lock) // rq->queuelist->next == NULL list_del_init(&rq->queuelist) spin_unlock(&nq->poll_lock) Fix these problems by setting requests state to MQ_RQ_COMPLETE under nq->poll_lock protection, in which null_timeout_rq() can safely detect this race and early return. Note this patch just fix the kernel panic when request timeout happen. [1] https://lore.kernel.org/all/3893581.1691785261@warthog.procyon.org.uk/

Scaner-VS 7 — a modern vulnerability management solution

Uses this database for vulnerability detection. High-speed search, cross-platform, advanced configuration audit, and flexible filtering. Suitable for organizations of any size.

Learn more about Scaner-VS 7

Sources

debianubuntu

Reference Links

https://www.cve.org/CVERecord?id=CVE-2023-53531

https://git.kernel.org/linus/5a26e45edb4690d58406178b5a9ea4c6dcf2c105 (6.6-rc1)

https://git.kernel.org/stable/c/5a26e45edb4690d58406178b5a9ea4c6dcf2c105

https://git.kernel.org/stable/c/a0b4a0666beacfe8add9c71d8922475541dbae73

https://git.kernel.org/stable/c/a7cb2e709f2927cc3c76781df3e45de2381b3b9d

Vulnerable Software (164)

Type: Configuration

Product: linux

Operating System: ubuntu bionic 18.04

Trait:

{  "unaffected": true}

Source: ubuntu

Type: Configuration

Product: linux

Operating System: ubuntu focal 20.04

Trait:

{  "unaffected": true}

Source: ubuntu

Type: Configuration

Product: linux

Operating System: ubuntu jammy 22.04

Trait:

{  "unaffected": true}

Source: ubuntu

Type: Configuration

Product: linux

Operating System: ubuntu trusty 14.04

Trait:

{  "unaffected": true}

Source: ubuntu

Type: Configuration

Product: linux

Operating System: ubuntu xenial 16.04

Trait:

{  "unaffected": true}

Source: ubuntu

Type: Configuration

Product: linux

Operating System: debian

Trait:

{  "fixed": "6.5.6-1"}

Source: debian

Type: Configuration

Product: linux

Operating System: debian bookworm 12

Trait:

{  "fixed": "6.1.55-1"}

Source: debian

Type: Configuration

Product: linux

Operating System: debian bullseye 11

Trait:

{  "unaffected": true}

Source: debian

Type: Configuration

Product: linux-allwinner-5.19

Operating System: ubuntu jammy 22.04

Trait:

{  "unfixed": true}

Source: ubuntu

Type: Configuration

Product: linux-aws

Operating System: ubuntu bionic 18.04

Trait:

{  "unaffected": true}

Source: ubuntu