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CVE Record

CVE-2024-36882: mm: use memalloc_nofs_save() in page_cache_ra_order()

In the Linux kernel, the following vulnerability has been resolved: mm: use memalloc_nofs_save() in page_cache_ra_order() See commit f2c817bed58d ("mm: use memalloc_nofs_save in readahead path"), ensure that page_cache_ra_order() do not attempt to reclaim file-backed pages too, or it leads to a deadlock, found issue when test ext4 large folio. INFO: task DataXceiver for:7494 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:DataXceiver for state:D stack:0 pid:7494 ppid:1 flags:0x00000200 Call trace: __switch_to+0x14c/0x240 __schedule+0x82c/0xdd0 schedule+0x58/0xf0 io_schedule+0x24/0xa0 __folio_lock+0x130/0x300 migrate_pages_batch+0x378/0x918 migrate_pages+0x350/0x700 compact_zone+0x63c/0xb38 compact_zone_order+0xc0/0x118 try_to_compact_pages+0xb0/0x280 __alloc_pages_direct_compact+0x98/0x248 __alloc_pages+0x510/0x1110 alloc_pages+0x9c/0x130 folio_alloc+0x20/0x78 filemap_alloc_folio+0x8c/0x1b0 page_cache_ra_order+0x174/0x308 ondemand_readahead+0x1c8/0x2b8 page_cache_async_ra+0x68/0xb8 filemap_readahead.isra.0+0x64/0xa8 filemap_get_pages+0x3fc/0x5b0 filemap_splice_read+0xf4/0x280 ext4_file_splice_read+0x2c/0x48 [ext4] vfs_splice_read.part.0+0xa8/0x118 splice_direct_to_actor+0xbc/0x288 do_splice_direct+0x9c/0x108 do_sendfile+0x328/0x468 __arm64_sys_sendfile64+0x8c/0x148 invoke_syscall+0x4c/0x118 el0_svc_common.constprop.0+0xc8/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x4c/0x1f8 el0t_64_sync_handler+0xc0/0xc8 el0t_64_sync+0x188/0x190

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-36882 is a Linux kernel memory-management bug that can cause blocked tasks or a deadlock during file readahead. The provided trace shows the issue in an ext4 large-folio test path using sendfile. The business impact is availability risk on affected Linux systems, not confirmed data theft or privilege escalation.

Executive priority

Track this as an availability reliability fix for Linux estates. Prioritize exposed production systems with high file I/O, but do not treat it as confirmed exploited based on the supplied evidence.

Technical view

The fix wraps page_cache_ra_order() allocation behavior with memalloc_nofs_save() so the readahead path does not reclaim file-backed pages and deadlock. The source references prior readahead NOFS handling and shows a blocked DataXceiver task in ext4_file_splice_read through filemap readahead and page allocation/compaction.

Likely exposure

Exposure is limited to Linux kernels covered by the affected metadata, including kernel lines around 5.18 and fixed stable references for 6.1.91, 6.6.31, 6.8.10, and 6.9. Distro backports may change package-level exposure.

Exploitation context

The source bundle does not claim active exploitation, public exploit availability, or remote triggerability. CISA KEV status is false. Evidence supports a kernel deadlock condition observed during testing with ext4 large folios, file readahead, and sendfile-style file transfer behavior.

Researcher notes

The record lacks CVSS, CWE, and exploitability detail. Key validation work is version-range interpretation and downstream distro backport mapping. Avoid assuming impact beyond deadlock or hung-task availability without additional vendor evidence.

Mitigation direction

  • Update affected Linux kernels using vendor or distribution guidance.
  • Map running kernel packages to the referenced stable fix commits.
  • Prioritize systems with heavy file serving, ext4, or sendfile workloads.
  • Check vendor advisories before applying assumptions from upstream version numbers.

Validation and detection

  • Inventory Linux kernel versions across servers and appliances.
  • Confirm whether distro kernels include the referenced upstream fixes.
  • Review kernel logs for hung tasks or blocked file I/O traces.
  • Test representative file-serving workloads after kernel updates.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-36882 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux793917d997df2e432f3e9ac126e4482d68256d01, 793917d997df2e432f3e9ac126e4482d68256d01, 793917d997df2e432f3e9ac126e4482d68256d01, 793917d997df2e432f3e9ac126e4482d68256d01unaffected
LinuxLinux5.18, 0, 6.1.91, 6.6.31, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.