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CVE-2024-26762— cxl/pci: Skip to handle RAS errors if CXL.mem device is detached

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RAS错误处理。

CVSS 7.8 · High EPSS 0.22% · P11

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab< 21e5e84f3f63fdf44e49642a6e45cd895e921a84 affected
6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab< eef5c7b28dbecd6b141987a96db6c54e49828102 affected
6.7 affected
< 6.7 unaffected
6.7.7≤ 6.7.* unaffected
6.8≤ * unaffected
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I. Basic Information for CVE-2024-26762

Vulnerability Information
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Vulnerability Title
cxl/pci: Skip to handle RAS errors if CXL.mem device is detached
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cxl/pci: Skip to handle RAS errors if CXL.mem device is detached The PCI AER model is an awkward fit for CXL error handling. While the expectation is that a PCI device can escalate to link reset to recover from an AER event, the same reset on CXL amounts to a surprise memory hotplug of massive amounts of memory. At present, the CXL error handler attempts some optimistic error handling to unbind the device from the cxl_mem driver after reaping some RAS register values. This results in a "hopeful" attempt to unplug the memory, but there is no guarantee that will succeed. A subsequent AER notification after the memdev unbind event can no longer assume the registers are mapped. Check for memdev bind before reaping status register values to avoid crashes of the form: BUG: unable to handle page fault for address: ffa00000195e9100 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page [...] RIP: 0010:__cxl_handle_ras+0x30/0x110 [cxl_core] [...] Call Trace: <TASK> ? __die+0x24/0x70 ? page_fault_oops+0x82/0x160 ? kernelmode_fixup_or_oops+0x84/0x110 ? exc_page_fault+0x113/0x170 ? asm_exc_page_fault+0x26/0x30 ? __pfx_dpc_reset_link+0x10/0x10 ? __cxl_handle_ras+0x30/0x110 [cxl_core] ? find_cxl_port+0x59/0x80 [cxl_core] cxl_handle_rp_ras+0xbc/0xd0 [cxl_core] cxl_error_detected+0x6c/0xf0 [cxl_core] report_error_detected+0xc7/0x1c0 pci_walk_bus+0x73/0x90 pcie_do_recovery+0x23f/0x330 Longer term, the unbind and PCI_ERS_RESULT_DISCONNECT behavior might need to be replaced with a new PCI_ERS_RESULT_PANIC.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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RAS错误处理。
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 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab ~ 21e5e84f3f63fdf44e49642a6e45cd895e921a84 -
Linux Linux 6.7 -

II. Public POCs for CVE-2024-26762

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III. Intelligence Information for CVE-2024-26762

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Other References for CVE-2024-26762 (2)

Same Patch Batch · Linux · 2024-04-03 · 94 CVEs total

CVE-2024-26760 9.8 CRITICAL scsi: target: pscsi: Fix bio_put() for error case
CVE-2024-26779 8.8 HIGH wifi: mac80211: fix race condition on enabling fast-xmit
CVE-2024-26689 8.8 HIGH ceph: prevent use-after-free in encode_cap_msg()
CVE-2024-26692 8.3 HIGH smb: Fix regression in writes when non-standard maximum write size negotiated
CVE-2024-26736 8.1 HIGH afs: Increase buffer size in afs_update_volume_status()
CVE-2023-52637 7.8 HIGH can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)
CVE-2024-26728 7.8 HIGH drm/amd/display: fix null-pointer dereference on edid reading
CVE-2024-26748 7.8 HIGH usb: cdns3: fix memory double free when handle zero packet
CVE-2024-26739 7.8 HIGH net/sched: act_mirred: don't override retval if we already lost the skb
CVE-2024-26718 7.8 HIGH dm-crypt, dm-verity: disable tasklets
CVE-2024-26712 7.8 HIGH powerpc/kasan: Fix addr error caused by page alignment
CVE-2024-26737 7.8 HIGH bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel
CVE-2024-26759 7.8 HIGH mm/swap: fix race when skipping swapcache
CVE-2024-26706 7.8 HIGH parisc: Fix random data corruption from exception handler
CVE-2024-26704 7.8 HIGH ext4: fix double-free of blocks due to wrong extents moved_len
CVE-2024-26766 7.8 HIGH IB/hfi1: Fix sdma.h tx->num_descs off-by-one error
CVE-2024-26699 7.8 HIGH drm/amd/display: Fix array-index-out-of-bounds in dcn35_clkmgr
CVE-2024-26697 7.8 HIGH nilfs2: fix data corruption in dsync block recovery for small block sizes
CVE-2024-26773 7.8 HIGH ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
CVE-2024-26772 7.8 HIGH ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()

Showing top 20 of 94 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26762

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