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CVE-2026-72378 (GCVE-0-2026-72378)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
afs: Fix error code in afs_extract_vl_addrs()
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix error code in afs_extract_vl_addrs() The error codes on these paths are only set on the first iteration through the loop. Set the correct error code on every iteration.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < 7ce6737a975ea3e0dc2e5946628d233779ca0caf (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < 4e0b047848a855f2c933a6439f76a01743ba5620 (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < f70fbf2b974b63a7042705c2b0464cb8c97e9f34 (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < 9ad9016e3333c3c1f9284a253ff0658369e07aac (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < cb33dd2968588c78fad78dec19f61cabe5785494 (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < 8530206911fd66ad739ca5ce95f1d069f3d42204 (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < bdcd80ff12939d172043fac5eb822b92366a1bab (git)
Affected: 0a5143f2f89cc88d8a3eada8e8ccd86c1e988257 , < 4897cb71d4ab1f7e1a214adb1e4b80176702368d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix error code in afs_extract_vl_addrs()\n\nThe error codes on these paths are only set on the first iteration\nthrough the loop.  Set the correct error code on every iteration."
        }
      ],
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              "value": "AV:N - Malformed data reaches afs_extract_vl_addrs() from DNS AFSDB server-list replies fetched over the network via dns_query()/request_key upcall during afs_dns_query() cell VL lookups and periodic TTL refresh.\nAC:L - An attacker who can supply the DNS server-list payload can reliably trigger the bug by encoding two or more addresses with a valid first entry and a truncated second IPv4/IPv6 record, forcing the stale ret=0 error path on iteration two or later.\nPR:N - No local account or kernel capabilities are required on the victim; a network-positioned attacker can deliver the malicious binary DNS server-list response whenever the kAFS client resolves an AFSDB record for a targeted cell name.\nUI:N - Exploitation does not require victim interaction at trigger time because kAFS automatically re-queries DNS on cell setup and TTL expiry through afs_update_cell(), so a poisoned response can crash the kernel without further user action.\nS:U - The flaw is a kernel NULL-pointer dereference in AFS DNS parsing that crashes the local host; it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:N - The failure mode is returning ERR_PTR(0) after freeing the address list, causing a NULL dereference in the caller; there is no out-of-bounds read, use-after-free reuse, or other memory disclosure primitive.\nI:N - Impact is limited to a kernel oops from writing addrs-\u003esource on a NULL pointer after a parse error is mishandled; no attacker-controlled memory corruption or arbitrary write primitive is established.\nA:H - The NULL pointer dereference in afs_extract_vlserver_list() runs in the kAFS cell manager workqueue during DNS parsing and causes a kernel oops or panic, fully denying system availability."
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          "url": "https://git.kernel.org/stable/c/4897cb71d4ab1f7e1a214adb1e4b80176702368d"
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Set the correct error code on every iteration.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/afs/vl_list.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"7ce6737a975ea3e0dc2e5946628d233779ca0caf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"4e0b047848a855f2c933a6439f76a01743ba5620\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"f70fbf2b974b63a7042705c2b0464cb8c97e9f34\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"9ad9016e3333c3c1f9284a253ff0658369e07aac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"cb33dd2968588c78fad78dec19f61cabe5785494\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"8530206911fd66ad739ca5ce95f1d069f3d42204\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"bdcd80ff12939d172043fac5eb822b92366a1bab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a5143f2f89cc88d8a3eada8e8ccd86c1e988257\",\"lessThan\":\"4897cb71d4ab1f7e1a214adb1e4b80176702368d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/afs/vl_list.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4897cb71d4ab1f7e1a214adb1e4b80176702368d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e0b047848a855f2c933a6439f76a01743ba5620\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ce6737a975ea3e0dc2e5946628d233779ca0caf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8530206911fd66ad739ca5ce95f1d069f3d42204\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ad9016e3333c3c1f9284a253ff0658369e07aac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdcd80ff12939d172043fac5eb822b92366a1bab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb33dd2968588c78fad78dec19f61cabe5785494\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f70fbf2b974b63a7042705c2b0464cb8c97e9f34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.