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CVE-2023-52564— Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 8fc0eabaa73bbd9bd705577071564616da5c8c61< 6d5c8862932d31a810b6545f7d69ecc124402c6e affected
5138c228311a863c3cf937b94a3ab4c87f1f70c4< a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb affected
9615ca54bc138e35353a001e8b5d4824dce72188< c61d0b87a7028c2c10faffc524d748334c7b9827 affected
9b9c8195f3f0d74a826077fc1c01b9ee74907239< 2bff660e0ff349dee84dc4f6f6d10da4497f5b28 affected
9b9c8195f3f0d74a826077fc1c01b9ee74907239< 29346e217b8ab8a52889b88f00b268278d6b7668 affected
74a8d6f50cc90ed0061997db51dfa81a62b0f835 affected
5.10.190< 5.10.198 affected
5.15.124< 5.15.134 affected
… +9 more rows
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I. Basic Information for CVE-2023-52564

Vulnerability Information
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Vulnerability Title
Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux" This reverts commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239. The commit above is reverted as it did not solve the original issue. gsm_cleanup_mux() tries to free up the virtual ttys by calling gsm_dlci_release() for each available DLCI. There, dlci_put() is called to decrease the reference counter for the DLCI via tty_port_put() which finally calls gsm_dlci_free(). This already clears the pointer which is being checked in gsm_cleanup_mux() before calling gsm_dlci_release(). Therefore, it is not necessary to clear this pointer in gsm_cleanup_mux() as done in the reverted commit. The commit introduces a null pointer dereference: <TASK> ? __die+0x1f/0x70 ? page_fault_oops+0x156/0x420 ? search_exception_tables+0x37/0x50 ? fixup_exception+0x21/0x310 ? exc_page_fault+0x69/0x150 ? asm_exc_page_fault+0x26/0x30 ? tty_port_put+0x19/0xa0 gsmtty_cleanup+0x29/0x80 [n_gsm] release_one_tty+0x37/0xe0 process_one_work+0x1e6/0x3e0 worker_thread+0x4c/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe1/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2f/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> The actual issue is that nothing guards dlci_put() from being called multiple times while the tty driver was triggered but did not yet finished calling gsm_dlci_free().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8fc0eabaa73bbd9bd705577071564616da5c8c61 ~ 6d5c8862932d31a810b6545f7d69ecc124402c6e -
Linux Linux 6.5 -

II. Public POCs for CVE-2023-52564

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III. Intelligence Information for CVE-2023-52564

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Mailing List Discussions for CVE-2023-52564 (4)

Other References for CVE-2023-52564 (5)

Same Patch Batch · Linux · 2024-03-02 · 57 CVEs total

CVE-2023-52515 9.8 CRITICAL RDMA/srp: Do not call scsi_done() from srp_abort()
CVE-2023-52530 8.8 HIGH wifi: mac80211: fix potential key use-after-free
CVE-2023-52522 8.8 HIGH net: fix possible store tearing in neigh_periodic_work()
CVE-2023-52502 8.8 HIGH net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()
CVE-2024-26621 8.2 HIGH mm: huge_memory: don't force huge page alignment on 32 bit
CVE-2023-52523 7.8 HIGH bpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets
CVE-2023-52509 7.8 HIGH ravb: Fix use-after-free issue in ravb_tx_timeout_work()
CVE-2023-52572 7.8 HIGH cifs: Fix UAF in cifs_demultiplex_thread()
CVE-2023-52574 7.8 HIGH team: fix null-ptr-deref when team device type is changed
CVE-2023-52517 7.8 HIGH spi: sun6i: fix race between DMA RX transfer completion and RX FIFO drain
CVE-2023-52503 7.8 HIGH tee: amdtee: fix use-after-free vulnerability in amdtee_close_session
CVE-2023-52513 7.5 HIGH RDMA/siw: Fix connection failure handling
CVE-2023-52565 7.1 HIGH media: uvcvideo: Fix OOB read
CVE-2023-52559 iommu/vt-d: Avoid memory allocation in iommu_suspend()
CVE-2023-52563 drm/meson: fix memory leak on ->hpd_notify callback
CVE-2023-52561 arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved
CVE-2023-52582 netfs: Only call folio_start_fscache() one time for each folio
CVE-2023-52566 nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
CVE-2023-52518 Bluetooth: hci_codec: Fix leaking content of local_codecs
CVE-2023-52560 mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()

Showing top 20 of 57 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52564

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