{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31548","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.114Z","datePublished":"2026-04-24T14:33:16.021Z","dateUpdated":"2026-08-05T12:23:25.445Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:23:25.445Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down\n\nWhen the nl80211 socket that originated a PMSR request is\nclosed, cfg80211_release_pmsr() sets the request's nl_portid\nto zero and schedules pmsr_free_wk to process the abort\nasynchronously. If the interface is concurrently torn down\nbefore that work runs, cfg80211_pmsr_wdev_down() calls\ncfg80211_pmsr_process_abort() directly. However, the already-\nscheduled pmsr_free_wk work item remains pending and may run\nafter the interface has been removed from the driver. This\ncould cause the driver's abort_pmsr callback to operate on a\ntorn-down interface, leading to undefined behavior and\npotential crashes.\n\nCancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()\nbefore calling cfg80211_pmsr_process_abort(). This ensures any\npending or in-progress work is drained before interface teardown\nproceeds, preventing the work from invoking the driver abort\ncallback after the interface is gone."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable path is reached through local nl80211 generic-netlink operations for `NL80211_CMD_PEER_MEASUREMENT_START` and netlink socket teardown/device teardown, not by remote WiFi frames alone.\nAC:L - The attacker can create the PMSR request, close the originating netlink socket to schedule `pmsr_free_wk`, and trigger interface teardown concurrently; this is an attacker-controlled race.\nPR:L - The start path is gated by `GENL_UNS_ADMIN_PERM`, requiring `CAP_NET_ADMIN` in the relevant network namespace. Under the kernel guidance, namespace-reachable `CAP_NET_ADMIN` is Low privileges rather than High.\nUI:N - No victim action is required once the attacker has local access and the needed netlink privilege; the attacker controls the request, socket close, and teardown sequence.\nS:U - The impact remains within the kernel/driver security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\nC:H - The stale pending work can operate on a torn-down wireless interface and driver state, a use-after-teardown/use-after-free style condition. In the highest defensible case, freed or invalid kernel objects may be reused to gain memory disclosure primitives.\nI:H - The same stale work and driver callback path can dereference and act on invalid or reallocated kernel/driver objects. Treating this as exploitable memory corruption makes arbitrary write or control-flow impact defensible.\nA:H - The commit explicitly describes undefined behavior and potential crashes from invoking the abort callback after interface teardown. A kernel crash or oops is High availability impact."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/pmsr.c"],"versions":[{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"28d3551f8d8cb3aec7497894d94150fe84d20e5e","status":"affected","versionType":"git"},{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"37e776e2e0a523731e2470dce6d563f0e8632a40","status":"affected","versionType":"git"},{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa","status":"affected","versionType":"git"},{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf","status":"affected","versionType":"git"},{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"72b7ea786b8e570ae11149e9089859a4a8634a13","status":"affected","versionType":"git"},{"version":"9bb7e0f24e7e7d00daa1219b14539e2e602649b2","lessThan":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/pmsr.c"],"versions":[{"version":"5.0","status":"affected"},{"version":"0","lessThan":"5.0","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.20","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.10","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/28d3551f8d8cb3aec7497894d94150fe84d20e5e"},{"url":"https://git.kernel.org/stable/c/37e776e2e0a523731e2470dce6d563f0e8632a40"},{"url":"https://git.kernel.org/stable/c/d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa"},{"url":"https://git.kernel.org/stable/c/a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf"},{"url":"https://git.kernel.org/stable/c/72b7ea786b8e570ae11149e9089859a4a8634a13"},{"url":"https://git.kernel.org/stable/c/6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09"}],"title":"wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down","x_generator":{"engine":"bippy-1.2.0"}}}}