CVE-2026-31435 (GCVE-0-2026-31435)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-10-19 18:35
VLAI
Title
netfs: Fix read abandonment during retry
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix read abandonment during retry Under certain circumstances, all the remaining subrequests from a read request will get abandoned during retry. The abandonment process expects the 'subreq' variable to be set to the place to start abandonment from, but it doesn't always have a useful value (it will be uninitialised on the first pass through the loop and it may point to a deleted subrequest on later passes). Fix the first jump to "abandon:" to set subreq to the start of the first subrequest expected to need retry (which, in this abandonment case, turned out unexpectedly to no longer have NEED_RETRY set). Also clear the subreq pointer after discarding superfluous retryable subrequests to cause an oops if we do try to access it.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:09 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 3e5fd8f53b575ff2188f82071da19c977ca56c41 (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 8f2f2bd128a8d9edbc1e785760da54ada3df69b7 (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 7e57523490cd2efb52b1ea97f2e0a74c0fb634cd (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.21",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19.11",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix read abandonment during retry\n\nUnder certain circumstances, all the remaining subrequests from a read\nrequest will get abandoned during retry.  The abandonment process expects\nthe \u0027subreq\u0027 variable to be set to the place to start abandonment from, but\nit doesn\u0027t always have a useful value (it will be uninitialised on the\nfirst pass through the loop and it may point to a deleted subrequest on\nlater passes).\n\nFix the first jump to \"abandon:\" to set subreq to the start of the first\nsubrequest expected to need retry (which, in this abandonment case, turned\nout unexpectedly to no longer have NEED_RETRY set).\n\nAlso clear the subreq pointer after discarding superfluous retryable\nsubrequests to cause an oops if we do try to access it."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The vulnerable netfs retry path processes read results from network filesystem peers such as SMB/CIFS, Ceph, AFS, 9P, and NFS/fscache-backed paths. A malicious or compromised remote filesystem server can drive retry/short-read behavior over the network.\nAC:L - The trigger is retry/abandonment state during ordinary read handling, and a malicious peer can influence short reads, retryable errors, reconnects, or malformed responses. No uncontrollable race or rare memory layout condition is required to reach the vulnerable path.\nPR:N - The attacker can be the remote filesystem peer and needs no privileges on the vulnerable client kernel. Local credentials may be needed by a victim/client to use the mount, but not by the remote attacker.\nUI:R - The client must mount/use the network filesystem and perform or have a process perform a read that reaches the affected netfs path. Opening or reading a file is victim-side interaction.\nS:U - The impact remains within the kernel/client system security authority. This is not a VM escape, IOMMU bypass, or cross-authority boundary escape.\nC:H - The bug can use an uninitialized or stale freed subrequest pointer in list traversal and field access. That kernel memory corruption/use-after-free is defensibly exploitable for information disclosure.\nI:H - The stale subrequest case can write fields and flags through a freed object and continue list traversal from freed memory. This is kernel memory corruption with potential arbitrary write/control-flow impact.\nA:H - Even without full exploitation, dereferencing an uninitialized or freed subrequest pointer can oops or panic the kernel. A malicious peer can repeatedly induce the read retry condition to cause denial of service."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:22:28.838Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/3e5fd8f53b575ff2188f82071da19c977ca56c41"
            },
            {
              "url": "https://git.kernel.org/stable/c/8f2f2bd128a8d9edbc1e785760da54ada3df69b7"
            },
            {
              "url": "https://git.kernel.org/stable/c/7e57523490cd2efb52b1ea97f2e0a74c0fb634cd"
            }
          ],
          "title": "netfs: Fix read abandonment during retry",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-31435",
        "datePublished": "2026-04-22T13:53:35.032Z",
        "dateReserved": "2026-03-09T15:48:24.089Z",
        "dateUpdated": "2026-10-16T15:09:59.945Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Nomenclature

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